HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Seattle (SEA) to Belfast from $355

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 10/16. 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 — BHD
May 4 — May 111
From?
To?
Sat 5/4
Sat 5/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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 April 29, 2024.

Popular in

December

Cheapest in

February

Round-trip from

$640

One-way from

$467
High demand for flights, 49% potential price rise
Search Deals
Best time to find cheap flights, 43% potential price drop
Search Deals
From Seattle/Tacoma Intl to Belfast
Search Deals
One-way flight from Seattle/Tacoma Intl to Belfast
Search Deals

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 Lufthansa flights from Seattle to Belfast

Explore cheap flight options specifically provided by Lufthansa 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 2,944,896 searches. Data last updated April 29, 2024.
Find some of the cheapest Lufthansa flights traveling from Seattle to Belfast. Deals update often to give you more flight options matching your criteria
Tue 7/97:05 pmSEA - BHD
2 stops35h 45mLufthansa
Tue 7/303:35 pmBHD - SEA
2 stops34h 51mLufthansa
Deal found 4/28$1,011
Fri 5/102:15 pmSEA - BHD
1 stop35h 10mLufthansa
Mon 5/133:35 pmBHD - SEA
1 stop28h 50mLufthansa
Deal found 4/28$1,268
Fri 5/102:15 pmSEA - BHD
1 stop35h 10mLufthansa
Mon 5/133:35 pmBHD - SEA
2 stops36h 43mLufthansa
Deal found 4/28$1,278

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 2,944,896 searches. Data last updated April 29, 2024.
Have a look at some of the cheapest available British Airways flights departing from Seattle and landing in Belfast. Ensure the flight price, dates, time, and airline match your criteria before you book.
Wed 10/167:40 pmSEA - BHD
1 stop14h 00mBritish Airways
Wed 10/239:50 amBHD - SEA
1 stop15h 55mBritish Airways
Deal found 4/29$639
Sat 9/147:40 pmSEA - BHD
1 stop12h 45mBritish Airways
Sat 9/286:50 amBHD - SEA
1 stop12h 45mBritish Airways
Deal found 4/29$849
Sat 9/77:40 pmSEA - BHD
1 stop15h 15mBritish Airways
Sat 9/216:50 amBHD - SEA
1 stop12h 45mBritish Airways
Deal found 4/28$864
Sat 8/107:40 pmSEA - BHD
1 stop12h 45mBritish Airways
Sat 8/246:55 pmBHD - SEA
1 stop24h 35mBritish Airways
Deal found 4/27$904
Sat 8/1011:50 pmSEA - BHD
2 stops30h 45mBritish Airways
Sat 8/246:50 amBHD - SEA
2 stops20h 02mBritish Airways
Deal found 4/28$917
Tue 7/91:30 pmSEA - BHD
1 stop15h 25mBritish Airways
Tue 7/309:45 amBHD - SEA
2 stops20h 13mBritish Airways
Deal found 4/28$1,055
Sat 5/1111:59 pmSEA - BHD
2 stops25h 06mBritish Airways
Fri 5/2411:50 amBHD - SEA
2 stops19h 15mBritish Airways
Deal found 4/28$1,101
Sat 5/1111:59 pmSEA - BHD
2 stops25h 06mBritish Airways
Fri 5/246:25 pmBHD - SEA
1 stop25h 10mBritish Airways
Deal found 4/28$1,116
Sat 5/111:50 pmSEA - BHD
1 stop12h 10mBritish Airways
Fri 5/246:25 pmBHD - SEA
1 stop25h 10mBritish Airways
Deal found 4/28$1,161

Cheap Seattle to Belfast flights in April & May 2024

Find cheap flight options from Seattle to Belfast specifically for the months of April and May 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,944,896 searches. Prices were last updated on April 29, 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.
Tue 5/286:10 pmSEA - BHD
1 stop14h 40mDelta
Tue 6/45:20 pmBHD - SEA
1 stop31h 15mDelta
Deal found 4/28$775
Tue 5/2811:50 amSEA - BHD
2 stops21h 00mDelta
Tue 6/45:20 pmBHD - SEA
1 stop31h 15mDelta
Deal found 4/28$780
Tue 5/2811:50 amSEA - BHD
2 stops21h 00mDelta
Tue 6/45:20 pmBHD - SEA
2 stops31h 40mDelta
Deal found 4/28$790
Sat 5/1111:59 pmSEA - BHD
2 stops25h 06mBritish Airways
Fri 5/2411:50 amBHD - SEA
2 stops19h 15mBritish Airways
Deal found 4/28$1,101
Sat 5/1111:59 pmSEA - BHD
2 stops25h 06mBritish Airways
Fri 5/246:25 pmBHD - SEA
1 stop25h 10mBritish Airways
Deal found 4/28$1,116
Sat 5/111:50 pmSEA - BHD
1 stop12h 10mBritish Airways
Fri 5/246:25 pmBHD - SEA
1 stop25h 10mBritish Airways
Deal found 4/28$1,161
Fri 5/102:15 pmSEA - BHD
1 stop35h 10mLufthansa
Mon 5/133:35 pmBHD - SEA
1 stop28h 50mLufthansa
Deal found 4/28$1,268
Fri 5/102:15 pmSEA - BHD
1 stop35h 10mLufthansa
Mon 5/133:35 pmBHD - SEA
2 stops36h 43mLufthansa
Deal found 4/28$1,278
Fri 5/101:30 pmSEA - BHD
2 stops19h 20mDelta
Mon 5/135:20 pmBHD - SEA
2 stops28h 51mDelta
Deal found 4/28$1,335

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 2,944,896 searches. Data last updated April 29, 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.
Sun 11/249:55 amSEA - BHD
2 stops22h 10mLufthansa
Sun 12/19:55 amBHD - SEA
1 stop34h 05mLufthansa
Deal found 4/28$735
Sun 11/242:35 pmSEA - BHD
1 stop18h 15mDelta
Sun 12/15:20 pmBHD - SEA
1 stop24h 55mDelta
Deal found 4/28$739
Sun 11/249:25 amSEA - BHD
2 stops23h 25mDelta
Sun 12/15:20 pmBHD - SEA
2 stops31h 12mDelta
Deal found 4/28$753
Tue 5/286:10 pmSEA - BHD
1 stop14h 40mDelta
Tue 6/45:20 pmBHD - SEA
1 stop31h 15mDelta
Deal found 4/28$775
Tue 5/2811:50 amSEA - BHD
2 stops21h 00mDelta
Tue 6/45:20 pmBHD - SEA
1 stop31h 15mDelta
Deal found 4/28$780
Fri 10/41:30 pmSEA - BHD
1 stop19h 20mVirgin Atlantic
Tue 10/85:20 pmBHD - SEA
1 stop31h 30mVirgin Atlantic
Deal found 4/28$787
Tue 5/2811:50 amSEA - BHD
2 stops21h 00mDelta
Tue 6/45:20 pmBHD - SEA
2 stops31h 40mDelta
Deal found 4/28$790
Thu 10/312:30 amSEA - BHD
2 stops32h 20mDelta
Tue 10/85:20 pmBHD - SEA
1 stop25h 15mDelta
Deal found 4/28$792
Tue 10/298:05 amSEA - BHD
2 stops25h 45mDelta
Sun 11/35:20 pmBHD - SEA
2 stops31h 12mDelta
Deal found 4/28$802

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 2,944,896 searches. Data last updated April 29, 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.
Wed 10/163:50 pmSEA - BHD
2 stops18h 55mMultiple Airlines
Deal found 4/29$355
Wed 10/163:50 pmSEA - BHD
3 stops17h 50mMultiple Airlines
Deal found 4/29$438
Wed 10/162:15 pmSEA - BHD
1 stop16h 35mLufthansa
Deal found 4/29$467
Fri 7/2611:00 pmSEA - BFS
2 stops32h 40mMultiple Airlines
Deal found 4/28$544
Fri 7/266:10 pmSEA - BHD
1 stop14h 40mDelta
Deal found 4/28$588
Fri 7/261:30 pmSEA - BHD
2 stops19h 20mDelta
Deal found 4/28$592
Fri 7/264:29 pmSEA - BFS
3 stops20h 26mMultiple Airlines
Deal found 4/28$1,069

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 2,944,896 searches. Data last updated April 29, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$639 - $1,202

Route

Depart

Return

Price

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/16

1 stop14h 00m

Belfast City

Wed 10/23

1 stop15h 55m

$639

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/16

2 stops20h 02m

Belfast City

Wed 10/23

1 stop18h 55m

$644

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 10/16

2 stops17h 52m

Belfast City

Wed 10/23

2 stops18h 55m

$654

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 5/28

1 stop14h 40m

Belfast City

Tue 6/4

1 stop31h 15m

$775

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 5/28

2 stops21h 00m

Belfast City

Tue 6/4

1 stop31h 15m

$780

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 10/4

1 stop19h 20m

Belfast City

Tue 10/8

1 stop31h 30m

$787

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 9/14

1 stop12h 45m

Belfast City

Sat 9/28

1 stop12h 45m

$849

Seattle/Tacoma IntlBelfast City

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 7/9

2 stops35h 45m

Belfast City

Tue 7/30

2 stops34h 51m

$1,011

Seattle/Tacoma IntlBelfast Intl

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 8/10

2 stops21h 35m

Belfast Intl

Sat 8/24

1 stop35h 05m

$1,202

Flights are sorted by cheapest first

Deals found on 4/29

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.
Search Deals

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 $579 while a round-trip flight costs $816. Price data was last updated on April 21, 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 $1,185). 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

$699

May

$788

June

$1,185

July

$963

August

$867

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 April 29, 2024.
Peruse reviews from past customers who have flown with Lufthansa, British Airways and American Airlines 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
10,932 reviews
Check prices

Comfort

7.9

Overall

8.1

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Delta
8.1
Very good
10,932 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Comfort

7.9

Overall

8.1

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Virgin Atlantic
7.7
Good
745 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Comfort

7.9

Overall

8.1

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

American Airlines
7.3
Good
14,844 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Comfort

7.9

Overall

8.1

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

Lufthansa
7.0
Good
7,738 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Comfort

7.9

Overall

8.1

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

British Airways
6.8
Okay
6,896 reviews
Delta
8.1
Very good
10,932 reviews
Check prices

Comfort

7.9

Overall

8.1

Entertainment

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Reviews

1 / 10

Terrible flight crew that skipped our row for service multiple times.

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 $639, but on average you can expect to pay $814.

  • 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 $639. Additional round-trip tickets that might be worth considering are offered by American Airlines and Delta, with the lowest prices starting at $644 and $775, respectively. British Airways is 45% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 4/28.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 2,944,896 searches. Data last updated April 29, 2024.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$642Average$924FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
British AirwaysCheapest$670Average$1,099FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Tampa to Denver flights
Cleveland to Miami flights
Maui to O'ahu flights
New York to Rome flights
Los Angeles to Phoenix flights
Philadelphia to Phoenix flights
Atlanta to Miami flights
Austin to San Francisco flights
Seattle to Las Vegas flights
Miami to Cuba flights
Newark Airport to Fort Lauderdale flights
Seattle to Scottsbluff flights

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.
First Class
Business Class
Prem Econ Class
Economy Class

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Perugia Sant Egidio
Flights to Biarritz Parme
Flights to Argostoli Cephalonia
Flights to Melilla
Flights to Milas–Bodrum
Flights to Girona Costa Brava
Flights to Hakodate
Flights to Fez Sais
Flights to Constantine Ain El Bey
Flights to Zakynthos Dionsios Salomos
Flights to Bourgas
Flights to Bodø
Flights to Reggio Calabria Tito Menniti
Flights to Bastia Poretta
Flights to Skiathos
Flights to Kalamata
Flights to Batumi
Flights to Menorca/Mahon
Flights to Kristiansand Kjevik
Flights to Champaign University-Willard
Flights to Kagoshima
Flights to Ohrid
Flights to Clermont-Ferrand Aulnat
Flights to Parikia Paros

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!

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines