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Cheap flights from Seattle (SEA) to Belfast from $450

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 5/27. 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 — BHD
May 10 — May 171
From?
To?
Fri 5/10
Fri 5/17
1 adult, Economy
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Cheap flight deals from Seattle to Belfast

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Belfast (BF1). 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 5, 2024.

Popular in

December

Cheapest in

February

Round-trip from

$640

One-way from

$469
High demand for flights, 49% potential price rise
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Best time to find cheap flights, 43% potential price drop
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From Seattle/Tacoma Intl to Belfast
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One-way flight from Seattle/Tacoma Intl to Belfast
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What is the cheapest day to fly round-trip from Seattle to Belfast?

Thursday is generally a great day to depart. Flying on this day could help you save up to 34%.

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

Our data shows that February tends to be the cheapest month to fly to Belfast from Seattle. Users have commonly found prices around $1,170 for the month, but tickets can be as low as $664. Due to multiple factors, prepare for potentially higher prices in December.

When is the cheapest time to fly from Seattle to Belfast (SEA - BFS)?

A simple way to save on the total cost of your ticket is to fly from Seattle to Belfast at noon. If you’re flexible enough to do this you can expect to save up to 17% on your trip compared to booking a flight in the afternoon.

Cheap British Airways flights from Seattle to Belfast

Explore cheap flight options specifically provided by British Airways for the route between Seattle and Belfast. 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 2,719,943 searches. Data last updated May 5, 2024.
Find some of the cheapest British Airways flights traveling from Seattle to Belfast. Deals update often to give you more flight options matching your criteria
Wed 10/231:30 pmSEA - BHD
1 stop14h 20mBritish Airways
Wed 11/66:45 amBHD - SEA
1 stop18h 00mBritish Airways
Deal found 5/3$640
Tue 10/292:35 pmSEA - BHD
1 stop13h 05mBritish Airways
Sun 11/39:40 amBHD - SEA
1 stop15h 05mBritish Airways
Deal found 5/4$731
Fri 10/41:30 pmSEA - BHD
1 stop16h 10mBritish Airways
Tue 10/89:45 amBHD - SEA
1 stop16h 00mBritish Airways
Deal found 5/3$758
Fri 10/47:40 pmSEA - BHD
1 stop14h 30mBritish Airways
Tue 10/86:35 amBHD - SEA
1 stop19h 10mBritish Airways
Deal found 5/4$759
Sat 9/711:50 pmSEA - BHD
2 stops30h 45mBritish Airways
Sat 9/216:55 pmBHD - SEA
1 stop24h 35mBritish Airways
Deal found 5/5$760
Sat 9/711:50 pmSEA - BHD
2 stops30h 45mBritish Airways
Sat 9/216:55 pmBHD - SEA
2 stops35h 50mBritish Airways
Deal found 5/5$764
Sat 8/1010:52 pmSEA - BHD
2 stops30h 08mBritish Airways
Sat 8/244:15 pmBHD - SEA
1 stop27h 15mBritish Airways
Deal found 5/5$782
Sat 9/77:40 pmSEA - BHD
1 stop12h 45mBritish Airways
Sat 9/216:50 amBHD - SEA
1 stop12h 45mBritish Airways
Deal found 5/4$794
Sat 9/146:36 amSEA - BHD
2 stops21h 44mBritish Airways
Sat 9/286:55 pmBHD - SEA
1 stop30h 50mBritish Airways
Deal found 5/5$798

Cheap American Airlines flights from Seattle to Belfast

Explore cheap flight options specifically provided by American Airlines for the route between Seattle and Belfast. 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 2,719,943 searches. Data last updated May 5, 2024.
Have a look at some of the cheapest available American Airlines flights departing from Seattle and landing in Belfast. Ensure the flight price, dates, time, and airline match your criteria before you book.
Wed 10/2311:33 amSEA - BHD
2 stops20h 02mAmerican Airlines
Wed 11/69:10 amBHD - SEA
1 stop34h 15mAmerican Airlines
Deal found 5/3$645
Tue 9/177:40 pmSEA - BHD
1 stop15h 15mAmerican Airlines
Tue 9/244:20 pmBHD - SEA
1 stop27h 15mAmerican Airlines
Deal found 5/4$666
Tue 9/1711:33 amSEA - BHD
2 stops19h 47mAmerican Airlines
Tue 9/241:40 pmBHD - SEA
1 stop29h 55mAmerican Airlines
Deal found 5/4$670
Tue 9/1711:33 amSEA - BHD
2 stops19h 47mAmerican Airlines
Tue 9/246:35 amBHD - SEA
2 stops22h 36mAmerican Airlines
Deal found 5/4$680
Tue 10/87:40 pmSEA - BHD
1 stop13h 45mAmerican Airlines
Sun 10/206:50 amBHD - SEA
1 stop12h 40mAmerican Airlines
Deal found 5/4$691
Tue 10/811:33 amSEA - BHD
2 stops19h 47mAmerican Airlines
Sun 10/206:50 amBHD - SEA
1 stop12h 40mAmerican Airlines
Deal found 5/4$695
Tue 10/811:33 amSEA - BHD
2 stops19h 47mAmerican Airlines
Sun 10/206:50 amBHD - SEA
2 stops22h 21mAmerican Airlines
Deal found 5/4$705
Tue 10/296:00 amSEA - BHD
2 stops21h 40mAmerican Airlines
Sun 11/33:05 pmBHD - SEA
1 stop33h 40mAmerican Airlines
Deal found 5/4$735
Tue 10/291:39 pmSEA - BHD
2 stops20h 01mAmerican Airlines
Sun 11/39:40 amBHD - SEA
2 stops18h 48mAmerican Airlines
Deal found 5/4$745

Seattle to Belfast 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Belfast in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,719,943 searches. Data last updated May 5, 2024.
These are some of the best deals we've found on flights to Belfast in 2024 at this time. Check back in a little while for more flight options.
Wed 10/231:30 pmSEA - BHD
1 stop14h 20mBritish Airways
Wed 11/66:45 amBHD - SEA
1 stop18h 00mBritish Airways
Deal found 5/3$640
Wed 9/257:40 pmSEA - BHD
1 stop14h 00mBritish Airways
Wed 10/29:50 amBHD - SEA
1 stop15h 55mBritish Airways
Deal found 5/5$641
Wed 9/2511:33 amSEA - BHD
2 stops20h 02mAmerican Airlines
Wed 10/29:50 amBHD - SEA
1 stop15h 55mAmerican Airlines
Deal found 5/5$645
Wed 9/2511:33 amSEA - BHD
2 stops20h 02mAmerican Airlines
Wed 10/29:50 amBHD - SEA
2 stops19h 21mAmerican Airlines
Deal found 5/5$655
Tue 9/177:40 pmSEA - BHD
1 stop15h 15mAmerican Airlines
Tue 9/244:20 pmBHD - SEA
1 stop27h 15mAmerican Airlines
Deal found 5/4$666
Tue 9/1711:33 amSEA - BHD
2 stops19h 47mAmerican Airlines
Tue 9/241:40 pmBHD - SEA
1 stop29h 55mAmerican Airlines
Deal found 5/4$670
Wed 10/231:10 pmSEA - BHD
2 stops17h 40mLufthansa
Wed 11/69:55 amBHD - SEA
2 stops22h 13mLufthansa
Deal found 5/3$678
Tue 9/1711:33 amSEA - BHD
2 stops19h 47mAmerican Airlines
Tue 9/246:35 amBHD - SEA
2 stops22h 36mAmerican Airlines
Deal found 5/4$680
Wed 11/206:45 pmSEA - BHD
1 stop16h 00mAmerican Airlines
Mon 11/259:05 amBHD - SEA
1 stop34h 20mAmerican Airlines
Deal found 5/5$681

One-way flights to Belfast from Seattle

Search for one-way flight options from Seattle to Belfast. 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 2,719,943 searches. Data last updated May 5, 2024.
Users in need of a one-way flight from Seattle to Belfast can choose from these deals. Users can also find round-trip Seattle to Belfast flights by using the search form above.
Mon 5/277:00 amSEA - BHD
2 stops26h 40mMultiple Airlines
Deal found 5/4$450
Wed 5/299:35 amSEA - BHD
3 stops51h 10mMultiple Airlines
Deal found 5/4$468
Wed 10/1610:40 amSEA - BHD
2 stops20h 10mLufthansa
Deal found 5/4$469
Mon 5/277:00 amSEA - BHD
3 stops28h 55mMultiple Airlines
Deal found 5/4$485
Tue 5/281:50 pmSEA - BHD
3 stops35h 15mMultiple Airlines
Deal found 5/4$491
Sun 5/261:50 pmSEA - BHD
2 stops35h 25mMultiple Airlines
Deal found 5/4$515
Thu 5/309:19 pmSEA - BHD
3 stops38h 41mMultiple Airlines
Deal found 5/4$535
Sat 5/252:49 pmSEA - BHD
3 stops34h 31mMultiple Airlines
Deal found 5/4$574
Fri 7/266:10 pmSEA - BHD
1 stop14h 40mDelta
Deal found 5/4$588

Find flights from Seattle to Belfast within your budget

Customize your flight search to find flights from Seattle to Belfast 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 2,719,943 searches. Data last updated May 5, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$640 - $1,339

Route

Depart

Return

Price

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/23

1 stop14h 20m

Belfast City

Wed 11/6

1 stop18h 00m

$640

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/23

2 stops20h 02m

Belfast City

Wed 11/6

1 stop34h 15m

$645

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 9/17

1 stop15h 15m

Belfast City

Tue 9/24

1 stop27h 15m

$666

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 9/17

2 stops19h 47m

Belfast City

Tue 9/24

1 stop29h 55m

$670

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/23

2 stops17h 40m

Belfast City

Wed 11/6

2 stops22h 13m

$678

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 10/29

1 stop13h 05m

Belfast City

Sun 11/3

1 stop15h 05m

$731

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 10/3

2 stops32h 20m

Belfast City

Tue 10/8

1 stop25h 15m

$792

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 10/4

2 stops26h 20m

Belfast City

Tue 10/8

1 stop25h 15m

$838

Seattle/Tacoma IntlBelfast Intl

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 7/12

2 stops22h 25m

Belfast Intl

Wed 7/24

3 stops19h 56m

$1,339

Flights are sorted by cheapest first

Deals found on 5/3

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

Use this chart to determine the cheapest time to fly round-trip from Seattle to Belfast. Price data was last updated on April 28, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to Belfast flight should consider departing on Thursday evenings when fares are most often at their lowest. Tuesday evenings 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 Belfast by month

Plan your trip from Seattle to Belfast by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Belfast is currently $508 while a round-trip flight costs $778. Price data was last updated on April 28, 2024.

Currently, February is the cheapest month in which you can book a flight from Seattle to Belfast (average of $641). Flying from Seattle to Belfast in June is currently the most expensive (average of $1,181). 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

$674

February

$641

March

$690

April

$686

May

$788

June

$1,181

July

$988

August

$869

September

$759

October

$684

November

$658

December

$728

Temperature and rainfall in Belfast by month

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

BFS

Temperature

41 - 60.8 °F

Reviews of airlines servicing Belfast

Get insights into the airlines that provide service to Belfast. 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 Belfast. Reviews last updated May 5, 2024.
Peruse reviews from past customers who have flown with British Airways, American Airlines and Delta from Seattle to Belfast to help guide your decision. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very good
10,826 reviews
Check prices

Overall

8.1

Crew

8.6

Comfort

7.9

Entertainment

8.0

Food

7.4

Boarding

8.2

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
10,826 reviews
Delta
8.1
Very good
10,826 reviews
Check prices

Overall

8.1

Crew

8.6

Comfort

7.9

Entertainment

8.0

Food

7.4

Boarding

8.2

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
1,603 reviews
Delta
8.1
Very good
10,826 reviews
Check prices

Overall

8.1

Crew

8.6

Comfort

7.9

Entertainment

8.0

Food

7.4

Boarding

8.2

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.

American Airlines
7.3
Good
14,713 reviews
Delta
8.1
Very good
10,826 reviews
Check prices

Overall

8.1

Crew

8.6

Comfort

7.9

Entertainment

8.0

Food

7.4

Boarding

8.2

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.

Iberia
7.1
Good
2,744 reviews
Delta
8.1
Very good
10,826 reviews
Check prices

Overall

8.1

Crew

8.6

Comfort

7.9

Entertainment

8.0

Food

7.4

Boarding

8.2

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.

Lufthansa
7.0
Good
7,719 reviews
Delta
8.1
Very good
10,826 reviews
Check prices

Overall

8.1

Crew

8.6

Comfort

7.9

Entertainment

8.0

Food

7.4

Boarding

8.2

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 Belfast. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Belfast?

    If you book a flight to Belfast from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 0 flights from Seattle/Tacoma Intl to Belfast per day from 2 different airlines.

  • Can I find flights from Seattle to Belfast for under $700 on Cheapflights?

    Yes, there are multiple flights from Seattle to Belfast for under $700. The cheapest flight booked recently is on British Airways for just $640, but on average you can expect to pay $722.

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

    Flying on British Airways is currently your cheapest option to Belfast, with prices starting at $640. Additional round-trip tickets that might be worth considering are offered by American Airlines and Lufthansa, with the lowest prices starting at $645 and $678, respectively. British Airways is 45% cheaper than the average price of flights available within the next 90 days to this destination.

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

    The cheapest airlines for a one-way flight from Seattle to Belfast are Lufthansa ($469), Delta ($588), and KLM ($652).

  • What does SEA to BFS mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Seattle/Tacoma Intl Airport to Belfast Intl Airport flight would often be abbreviated as a SEA to BFS flight. Belfast City Airport (BHD), Glasgow Prestwick Airport (PIK), Londonderry Eglinton Airport (LDY), Isle of Islay Glenegedale Airport (ILY), Campbeltown Machrihanish Airport (CAL) are some additional IATA codes for airports related to your trip.

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

    The amount of baggage you can bring on your Seattle to Belfast 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 Belfast with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Belfast 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 Belfast that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Belfast 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 Belfast that allow pets onboard?

    Many airlines flying from Seattle to Belfast 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 Belfast?

    Yes, you can often find last-minute deals on Seattle to Belfast 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 Belfast flight deals updated?

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

See more FAQs

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Alternative routes for Seattle to Belfast
See prices for flight routes from nearby airports that may be better suited for you.

Seattle to Belfast Intl flights
Seattle to Belfast City flights

Top 2 airlines flying from Seattle to Belfast

Discover the top 2 airlines that operate flights from Seattle to Belfast. 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 2,719,943 searches. Data last updated May 5, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$642Average$926FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest$670Average$1,099FlexibilityNo cancel feeOn-time70%
Search British Airways flights
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Search flights from Seattle to Belfast by cabin class

Find flights from Seattle to Belfast, based on your preferred cabin class, be it economy, premium economy, business, or first 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 Belfast?

Cheapflights makes it easy to find Seattle to Belfast flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Seattle to Belfast for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to Belfast flexibly with Cheapflights today.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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