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$389+ Cheap flights from Washington to Belfast

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 8/16. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheap flight deals from Washington to Belfast

Keep the following information in mind while searching for Washington to Belfast flight deals. Data was last updated July 31, 2025.

Round-trip from

$564
(Trip.com)

One-way from

$389
(Kiwi.com)

Popular in

July

Cheapest in

March

Average price

$1,145
From Washington to Belfast
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One-way flight from Washington to Belfast
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Highest demand for flights based on searches. 11% potential increase in price ($123 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Washington to Belfast

Cheapest flights from Washington to Belfast
Explore the most affordable flight options available from Washington to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

This Trip.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/147:00 pmSEA - BFS
2 stops19h 25mMultiple Airlines
Mon 9/296:45 amBFS - SEA
2 stops21h 55mMultiple Airlines
Deal found 7/31$564
This Trip.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/147:00 pmSEA - BHD
2 stops17h 25mMultiple Airlines
Mon 9/297:05 amBHD - SEA
2 stops21h 35mMultiple Airlines
Deal found 7/31$657
This Justfly.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2311:59 pmPDX - BHD
2 stops25h 21mBritish Airways
Sun 8/316:50 amBHD - PDX
2 stops23h 14mBritish Airways
Deal found 7/30$738
This oojo deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/103:00 pmSEA - BHD
2 stops16h 35mBritish Airways
Mon 9/157:30 pmBHD - SEA
1 stop23h 40mBritish Airways
Deal found 7/30$743
This Expedia deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/145:40 pmSEA - BHD
1 stop15h 15mKLM
Mon 9/295:25 pmBHD - SEA
2 stops30h 41mKLM
Deal found 7/31$828
This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/149:40 amSEA - BHD
2 stops23h 15mDelta
Mon 9/296:30 amBHD - SEA
2 stops17h 36mDelta
Deal found 7/31$890
This American Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/21:23 amSEA - BHD
2 stops28h 52mAmerican Airlines
Sun 12/76:30 amBHD - SEA
2 stops19h 50mAmerican Airlines
Deal found 7/30$985
This Virgin Atlantic deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:00 amSEA - BHD
2 stops26h 50mVirgin Atlantic
Sun 1/115:20 pmBHD - SEA
2 stops31h 40mVirgin Atlantic
Deal found 7/30$1,574

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington 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 2,558,603 searches. Data last updated July 31, 2025.
Use the filters below to find and compare flights from Washington to Belfast that are best for you.

Fly from

Washington

Fly to

Belfast

Route

Depart

Return

Price

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 9/14

7:00 pm-10:25 pm

2 stops19h 25m

Belfast Intl

Mon 9/29

6:45 am-8:40 pm

2 stops21h 55m

$564

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 9/14

7:00 pm-8:25 pm

2 stops17h 25m

Belfast City

Mon 9/29

7:05 am-8:40 pm

2 stops21h 35m

$657

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sat 8/23

11:59 pm-9:20 am

2 stops25h 21m

Belfast City

Sun 8/31

6:50 am-10:04 pm

2 stops23h 14m

$738

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 9/10

3:00 pm-3:35 pm

2 stops16h 35m

Belfast City

Mon 9/15

7:30 pm-11:10 am

1 stop23h 40m

$743

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 9/14

5:40 pm-4:55 pm

1 stop15h 15m

Belfast City

Mon 9/29

5:25 pm-4:06 pm

2 stops30h 41m

$828

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 9/14

9:40 am-4:55 pm

2 stops23h 15m

Belfast City

Mon 9/29

6:30 am-4:06 pm

2 stops17h 36m

$890

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 12/2

1:23 am-2:15 pm

2 stops28h 52m

Belfast City

Sun 12/7

6:30 am-6:20 pm

2 stops19h 50m

$985

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 12/23

6:00 am-4:50 pm

2 stops26h 50m

Belfast City

Sun 1/11

5:20 pm-5:00 pm

2 stops31h 40m

$1,574

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 8/16

7:48 pm-7:40 am

3 stops51h 52m

$389

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Thu 9/18

1:08 pm-8:25 pm

2 stops47h 17m

$412

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

Showing 1-10 of 17 results
1
2

Best time to book a flight from Washington to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Washington with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington to Belfast

What is the cheapest time of day to fly from WA to BFS?

Find hourly flight availability from Washington to Belfast. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from State of Washington to Belfast as you normally would.

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 July 31, 2025.
Read through reviews of airlines operating flights from Washington to Belfast, such as Delta, KLM, and Virgin Atlantic. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Virgin Atlantic
7.4
Good
655 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
British Airways
6.6
Okay
7,222 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Overall

8.0

Boarding

8.2

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

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

  • What are the cheapest airlines to fly from State of Washington to Belfast one-way?

    The cheapest airline one-way is British Airways, with whom users have recently found tickets for as low as $421. However, be on the lookout for offers from American Airlines and KLM, as they are both options that can get you from State of Washington to Belfast for a low price.

  • What are the most popular routes from State of Washington to Belfast?

    While some choose either Seattle/Tacoma Intl - Belfast City or Portland - Belfast Intl, Seattle/Tacoma Intl - Belfast Intl is the most popular route from State of Washington to Belfast.

  • Can I find deals for flights from Washington to Belfast that include hotel bookings?

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

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

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

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

    Yes. Cheapflights offers flight deals from Washington 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.

  • What is the cheapest month to book a flight from State of Washington to Belfast?

    Currently, February is the cheapest month in which you can book a flight from State of Washington to Belfast (average of $657). Flying from State of Washington to Belfast in June is currently the most expensive (average of $1,189). 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.

See more FAQs

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Alternative routes for Washington to Belfast

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Top airline flying from Washington to Belfast

Discover the top airline that operate flights from Washington 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 2,558,603 searches. Data last updated July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$519Average$866FlexibilityNo cancel feeOn-time70%

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