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Cheap flights from Seattle (SEA) to Porto (OPO) from $398

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/16. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — OPO
May 14 — May 211
From?
To?
Tue 5/14
Tue 5/21
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to Porto are usually found in February or November, booked 17 days in advance, depart on a Wednesday or Tuesday and return on a Monday

Cheap flight deals from Seattle to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 9, 2024.

Popular in

June

Cheapest in

February

Average price

$1,338

Round-trip from

$523
High demand for flights, 32% potential price rise
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Best time to find cheap flights, 35% potential price drop
Search Deals
Average for round-trip flights in May 2024
Search Deals
From Seattle/Tacoma Intl to Porto
Search Deals

What is the cheapest day to fly round-trip from Seattle to Porto?

Flights from Seattle to Porto are found to be more expensive on Saturday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Porto.

How far in advance should I book a flight from Seattle to Porto?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 17 days in advance, which can save you up to 52% on flights from Seattle to Porto compared to booking the week you need them. Waiting 17 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $984. For sooner than that we have options available in the next 3 days from $2,570.

What is the cheapest month to fly from Seattle to Porto?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, February can be a great choice for travel to Porto. Flights to Porto from Seattle in February are about $1,156 on average during February, but can be found for as low as $693.

When is the cheapest time to fly from Seattle to Porto (SEA - OPO)?

It’s optimal to fly from Seattle to Porto in the morning. By choosing this option you can save up to 12% on the cost of your flight, compared to a flight in the evening.

Cheap KLM flights from Seattle to Porto

Explore cheap flight options specifically provided by KLM for the route between Seattle and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Consider these cheap KLM flights we've found departing from Seattle to Porto. Be sure to come back soon if the deals available don't appeal to you at this time.
Wed 8/76:10 pmSEA - OPO
1 stop20h 05mKLM
Thu 8/224:20 pmOPO - SEA
1 stop25h 55mKLM
Deal found 5/7$814
Tue 9/176:10 pmSEA - OPO
1 stop20h 05mKLM
Thu 10/108:55 pmOPO - SEA
1 stop21h 40mKLM
Deal found 5/7$957
Tue 9/176:10 pmSEA - OPO
1 stop20h 05mKLM
Tue 10/86:45 amOPO - SEA
2 stops20h 38mKLM
Deal found 5/7$967
Wed 9/189:15 pmSEA - OPO
2 stops17h 00mKLM
Mon 10/74:20 pmOPO - SEA
1 stop26h 15mKLM
Deal found 5/7$1,133
Thu 9/199:15 pmSEA - OPO
2 stops17h 00mKLM
Wed 10/96:30 amOPO - SEA
1 stop18h 20mKLM
Deal found 5/7$1,183

Cheap Delta flights from Seattle to Porto

Explore cheap flight options specifically provided by Delta for the route between Seattle and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Some of the best deals we've found on Delta flights traveling from Seattle to Porto. Ensure the flight price, dates, time, and airline match your criteria before you book.
Wed 8/76:10 pmSEA - OPO
1 stop20h 05mDelta
Thu 8/229:15 amOPO - SEA
2 stops20h 59mDelta
Deal found 5/7$822
Wed 8/71:50 pmSEA - OPO
2 stops17h 50mDelta
Thu 8/229:15 amOPO - SEA
2 stops22h 32mDelta
Deal found 5/7$826
Tue 9/176:10 pmSEA - OPO
1 stop20h 05mDelta
Wed 10/99:15 amOPO - SEA
1 stop16h 35mDelta
Deal found 5/7$954
Sat 9/216:10 pmSEA - OPO
1 stop20h 05mDelta
Wed 10/99:15 amOPO - SEA
1 stop16h 35mDelta
Deal found 5/7$962
Tue 9/176:10 pmSEA - OPO
1 stop20h 05mDelta
Fri 10/119:15 amOPO - SEA
2 stops22h 31mDelta
Deal found 5/7$964
Sat 9/216:10 pmSEA - OPO
1 stop20h 05mDelta
Mon 10/76:30 amOPO - SEA
1 stop36h 05mDelta
Deal found 5/7$965
Sat 9/216:10 pmSEA - OPO
1 stop20h 05mDelta
Wed 10/99:15 amOPO - SEA
2 stops20h 56mDelta
Deal found 5/7$973
Sat 6/81:35 pmSEA - OPO
1 stop17h 55mDelta
Sat 6/224:20 pmOPO - SEA
1 stop27h 00mDelta
Deal found 5/8$1,157
Sat 6/81:35 pmSEA - OPO
1 stop17h 55mDelta
Sat 6/225:00 amOPO - SEA
2 stops22h 00mDelta
Deal found 5/8$1,158

Cheap Seattle to Porto flights in May & June 2024

Find cheap flight options from Seattle to Porto specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,752,338 searches. Prices were last updated on May 9, 2024.
Listed are some of the best fares we've found on flights departing from Seattle to Porto in 2024. For more flight deals, be sure to check back very soon.
Wed 6/510:40 amSEA - OPO
2 stops17h 05mMultiple Airlines
Wed 6/128:40 amOPO - SEA
2 stops34h 03mMultiple Airlines
Deal found 5/8$880
Sat 6/17:00 amSEA - OPO
2 stops25h 15mMultiple Airlines
Mon 6/106:15 amOPO - SEA
3 stops33h 15mMultiple Airlines
Deal found 5/8$980
Wed 6/56:55 pmSEA - OPO
3 stops31h 30mMultiple Airlines
Wed 6/124:55 amOPO - SEA
3 stops23h 40mMultiple Airlines
Deal found 5/8$1,001
Wed 6/512:10 pmSEA - OPO
1 stop13h 35mMultiple Airlines
Wed 6/126:15 amOPO - SEA
2 stops24h 02mMultiple Airlines
Deal found 5/8$1,007
Wed 6/56:51 amSEA - OPO
1 stop16h 04mUnited Airlines
Wed 6/1212:35 pmOPO - SEA
1 stop16h 48mUnited Airlines
Deal found 5/8$1,011
Sat 6/17:05 pmSEA - OPO
3 stops36h 00mMultiple Airlines
Mon 6/106:15 amOPO - SEA
3 stops33h 15mMultiple Airlines
Deal found 5/8$1,015
Sat 6/17:05 pmSEA - OPO
2 stops32h 40mMultiple Airlines
Mon 6/101:30 pmOPO - SEA
2 stops30h 57mMultiple Airlines
Deal found 5/8$1,054
Sat 6/81:10 pmSEA - OPO
2 stops18h 35mAir Canada
Sat 6/226:15 amOPO - SEA
2 stops23h 43mAir Canada
Deal found 5/8$1,143
Sat 6/111:50 pmSEA - OPO
2 stops23h 05mUnited Airlines
Mon 6/1012:35 pmOPO - SEA
1 stop16h 48mUnited Airlines
Deal found 5/8$1,150

Seattle to Porto 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Porto in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Listed are some of the best fares we've found on flights departing from Seattle to Porto in 2024. For more flight deals, be sure to check back very soon.
Sat 11/27:05 pmSEA - OPO
2 stops33h 30mAir Canada
Tue 11/126:00 amOPO - SEA
2 stops23h 08mAir Canada
Deal found 5/8$703
Sat 11/211:59 pmSEA - OPO
2 stops32h 46mUnited Airlines
Tue 11/1212:30 pmOPO - SEA
1 stop31h 30mUnited Airlines
Deal found 5/8$729
Sat 11/212:59 pmSEA - OPO
3 stops39h 36mUnited Airlines
Tue 11/126:00 amOPO - SEA
2 stops35h 53mUnited Airlines
Deal found 5/8$735
Sun 11/245:50 amSEA - OPO
2 stops21h 45mAir Canada
Sun 12/86:00 amOPO - SEA
2 stops23h 08mAir Canada
Deal found 5/8$753
Fri 11/299:55 amSEA - OPO
2 stops17h 40mMultiple Airlines
Mon 12/912:45 pmOPO - SEA
2 stops41h 44mMultiple Airlines
Deal found 5/8$766
Sun 11/241:50 pmSEA - OPO
1 stop17h 55mLufthansa
Sun 12/86:00 amOPO - SEA
2 stops22h 10mLufthansa
Deal found 5/9$768
Thu 11/289:45 amSEA - OPO
2 stops19h 05mMultiple Airlines
Mon 12/94:35 pmOPO - SEA
2 stops36h 33mMultiple Airlines
Deal found 5/8$769
Fri 11/292:07 pmSEA - OPO
2 stops24h 18mLufthansa
Mon 12/91:45 pmOPO - SEA
1 stop35h 20mLufthansa
Deal found 5/8$772
Sun 11/241:50 pmSEA - OPO
1 stop17h 55mLufthansa
Sun 12/812:30 pmOPO - SEA
1 stop31h 30mLufthansa
Deal found 5/9$773

One-way flights to Porto from Seattle

Search for one-way flight options from Seattle to Porto. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
Users in need of a one-way flight from Seattle to Porto can choose from these deals. Those needing a return flight from Seattle to Porto can use the search form above.
Mon 9/163:50 pmSEA - OPO
3 stops22h 40mMultiple Airlines
Deal found 5/8$398
Mon 9/163:50 pmSEA - OPO
2 stops20h 25mMultiple Airlines
Deal found 5/8$435
Fri 7/127:00 amSEA - OPO
3 stops41h 40mMultiple Airlines
Deal found 5/7$469
Tue 8/276:55 pmSEA - OPO
3 stops28h 25mMultiple Airlines
Deal found 5/8$471
Fri 7/1211:00 pmSEA - OPO
2 stops34h 20mMultiple Airlines
Deal found 5/7$528
Sat 7/135:20 amSEA - OPO
3 stops33h 35mMultiple Airlines
Deal found 5/7$602
Tue 8/2711:00 pmSEA - OPO
2 stops24h 35mMultiple Airlines
Deal found 5/8$635
Sat 7/2011:47 pmSEA - OPO
2 stops23h 08mUnited Airlines
Deal found 5/8$662
Sun 7/141:10 pmSEA - OPO
2 stops18h 35mAir Canada
Deal found 5/8$686

Find flights from Seattle to Porto within your budget

Customize your flight search to find flights from Seattle to Porto that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$703 - $1,060

Route

Depart

Return

Price

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 11/2

2 stops33h 30m

Porto

Tue 11/12

2 stops23h 08m

$703

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sat 11/2

2 stops32h 46m

Porto

Tue 11/12

1 stop31h 30m

$729

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/7

1 stop20h 05m

Porto

Thu 8/22

1 stop25h 55m

$814

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 8/7

1 stop20h 05m

Porto

Thu 8/22

2 stops20h 59m

$822

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 9/17

2 stops34h 35m

Porto

Tue 10/8

2 stops17h 46m

$872

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Wed 6/5

2 stops17h 05m

Porto

Wed 6/12

2 stops34h 03m

$880

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Sun 9/29

1 stop20h 30m

Porto

Sat 11/2

1 stop35h 20m

$922

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Tue 9/17

1 stop37h 10m

Porto

Tue 10/8

1 stop37h 30m

$932

Seattle/Tacoma IntlPorto

SEA - OPO

SEAOPO

Seattle/Tacoma Intl

Mon 9/16

2 stops20h 30m

Porto

Mon 10/7

2 stops39h 36m

$1,060

Flights are sorted by cheapest first

Deals found on 5/8

When is the best time to book a flight from Seattle to Porto?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Porto. Price data was last updated on May 3, 2024.
Booking 16 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Porto. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Search Deals

When is the cheapest time to fly from Seattle to Porto?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Porto. Price data was last updated on May 5, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to Porto flight should consider departing on Saturday mornings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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Average price of flights to Porto by month

Plan your trip from Seattle to Porto by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Porto is currently $543 while a round-trip flight costs $859. Price data was last updated on May 5, 2024.

Currently, January is the cheapest month in which you can book a flight from Seattle to Porto (average of $523). Flying from Seattle to Porto in June is currently the most expensive (average of $1,016). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

January

$523

February

$581

March

$599

April

$742

May

$879

June

$1,016

July

$983

August

$865

September

$766

October

$694

November

$554

December

$645

Temperature and rainfall in Porto by month

Plan your trip to Porto by taking into account the average temperature and rainfall totals by month.

OPO

Temperature

48.2 - 68 °F

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated May 9, 2024.
To help decide which airline to fly from Seattle to Porto, see what other customers have to say about KLM, Delta and SWISS. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,789 reviews
Check prices

Food

7.4

Overall

8.1

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta
8.1
Very good
10,789 reviews
Delta
8.1
Very good
10,789 reviews
Check prices

Food

7.4

Overall

8.1

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

KLM
7.9
Good
1,592 reviews
Delta
8.1
Very good
10,789 reviews
Check prices

Food

7.4

Overall

8.1

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

SWISS
7.8
Good
2,013 reviews
Delta
8.1
Very good
10,789 reviews
Check prices

Food

7.4

Overall

8.1

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Austrian Airlines
7.7
Good
1,062 reviews
Delta
8.1
Very good
10,789 reviews
Check prices

Food

7.4

Overall

8.1

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Turkish Airlines
7.5
Good
3,712 reviews
Delta
8.1
Very good
10,789 reviews
Check prices

Food

7.4

Overall

8.1

Comfort

7.9

Entertainment

8.0

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • Can I find flights from Seattle to Porto for under $800 on Cheapflights?

    Yes, there are multiple flights from Seattle to Porto for under $800. The cheapest flight booked recently is on Air Canada for just $703, but on average you can expect to pay $863.

  • What are the cheapest airlines flying from Seattle to Porto round-trip?

    Our cheapest airline available from Seattle to Porto is Air Canada. Our recent data shows that you can find tickets from as low as $703 on this airline. Additional options worth looking into are United Airlines and KLM, starting at $729 and $814 round-trip. Users have found that Air Canada is 39% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Seattle to Porto one-way?

    $662 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Air Canada and Turkish Airlines, with prices starting from $686 and $737, respectively.

  • What are the most popular airlines that fly from Seattle to Porto?

    When booking a flight from Seattle to Porto, you may want to consider flying on American Airlines, Air France or British Airways as they are the most popular for this route.

  • What does SEA to OPO mean?

    This is defined as Seattle/Tacoma Intl Airport (SEA) and Porto Airport (OPO). Codes like Porto Airport are often used to just call airports uniquely.

  • Can I find deals for flights from Seattle to Porto that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Porto flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Porto with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Porto flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to Porto that include hotel bookings?

    Yes. In addition to deals on Seattle to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Porto.

  • Can I find deals for business class flights from Seattle to Porto?

    Yes. Cheapflights offers flight deals from Seattle to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Porto that allow pets onboard?

    Many airlines flying from Seattle to Porto offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Porto?

    Yes, you can often find last-minute deals on Seattle to Porto flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to Porto flight deals updated?

    The Seattle to Porto flight deals you see on this page were last updated on 5/9.

See more FAQs

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Top 8 airlines flying from Seattle to Porto

Discover the top 8 airlines that operate flights from Seattle to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,752,338 searches. Data last updated May 9, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$544Average$725FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$696Average$1,080FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
KLMCheapest$754Average$1,138FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest$838Average$1,222FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest$880Average$1,162FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest$887Average$1,369FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Turkish AirlinesCheapest$914Average$976FlexibilityNo cancel feeOn-time77%
Search Turkish Airlines flights
Air FranceCheapest$1,116Average$1,562FlexibilityNo cancel feeOn-time77%
Search Air France flights
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Search flights from Seattle to Porto by cabin class

Find flights from Seattle to Porto, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Business Class
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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Porto?

Deals for Seattle to Porto flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Porto?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Porto from Seattle.

Can Cheapflights find flights from Seattle to Porto with no change fees?

Yes, we can. To see specific flights from Seattle to Porto with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Porto become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Porto from Seattle today and book when prices fit your budget.

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