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$647+ Cheap flights from Washington to Belfast

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
Apr 7 — Apr 141
Mon 4/7
Mon 4/14
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 April 2, 2025.

Round-trip from

$774
(British Airways)

Popular in

June

Cheapest in

October

Average price

$838
From Washington to Belfast
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($200 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($52 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 2, 2025.

This oojo deal was found by Cheapflights users on 4/1. 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.
Sat 10/2511:59 pmPDX - BHD
2 stops27h 21mBritish Airways
Tue 11/411:30 amBHD - PDX
2 stops19h 22mBritish Airways
Deal found 4/1$647
This Finnair deal was found by Cheapflights users on 4/1. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:25 pmPDX - BHD
1 stop14h 15mMultiple Airlines
Tue 11/48:40 amBHD - PDX
2 stops21h 21mMultiple Airlines
Deal found 4/1$683
This Finnair deal was found by Cheapflights users on 4/2. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/282:35 pmSEA - BHD
1 stop16h 00mMultiple Airlines
Tue 11/46:35 amBHD - SEA
1 stop12h 45mMultiple Airlines
Deal found 4/2$698
This American Airlines deal was found by Cheapflights users on 4/2. 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 10/283:13 pmSEA - BHD
2 stops16h 42mAmerican Airlines
Tue 11/411:30 amBHD - SEA
2 stops19h 45mAmerican Airlines
Deal found 4/2$721
This KLM deal was found by Cheapflights users on 4/1. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/251:15 pmPDX - BHD
1 stop24h 45mKLM
Tue 11/45:20 pmBHD - PDX
1 stop26h 05mKLM
Deal found 4/1$732
This British Airways deal was found by Cheapflights users on 4/1. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/308:20 pmSEA - BHD
1 stop14h 20mBritish Airways
Mon 5/126:30 pmBHD - SEA
1 stop24h 40mBritish Airways
Deal found 4/1$774
This Delta deal was found by Cheapflights users on 4/1. 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 5/49:25 amSEA - BHD
2 stops27h 50mDelta
Mon 5/125:25 pmBHD - SEA
1 stop26h 15mDelta
Deal found 4/1$878
This Cheapflightsfares deal was found by Cheapflights users on 4/1. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/156:45 pmSEA - BHD
2 stops17h 10mAer Lingus
Tue 7/226:15 pmBHD - SEA
2 stops30h 44mAer Lingus
Deal found 4/1$962
This KLM deal was found by Cheapflights users on 4/1. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/12:10 pmSEA - BHD
1 stop23h 05mKLM
Mon 5/126:30 amBHD - SEA
2 stops17h 38mKLM
Deal found 4/1$965
This Mytrip deal was found by Cheapflights users on 4/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/253:20 pmPDX - BFS
2 stops23h 00mMultiple Airlines
Tue 11/410:40 amBFS - PDX
2 stops38h 20mMultiple Airlines
Deal found 4/1$1,013
This Finnair deal was found by Cheapflights users on 4/1. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/46:08 amSEA - BHD
2 stops21h 22mFinnair
Sat 5/104:15 pmBHD - SEA
2 stops31h 45mFinnair
Deal found 4/1$1,044
This Mytrip deal was found by Cheapflights users on 4/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/163:45 pmSEA - BFS
2 stops20h 20mMultiple Airlines
Fri 5/239:05 pmBFS - SEA
3 stops35h 05mMultiple Airlines
Deal found 4/1$1,048

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 April 2, 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 - BHD

SEABHD

Seattle/Tacoma Intl

Wed 4/30

8:20 pm-6:40 pm

1 stop14h 20m

Belfast City

Mon 5/12

6:30 pm-11:10 am

1 stop24h 40m

$774

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 5/2

1:35 pm-3:30 pm

2 stops17h 55m

Belfast City

Sun 5/11

3:50 pm-11:35 am

1 stop27h 45m

$811

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 5/4

9:25 am-9:15 pm

2 stops27h 50m

Belfast City

Mon 5/12

5:25 pm-11:40 am

1 stop26h 15m

$878

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 7/15

6:45 pm-7:55 pm

2 stops17h 10m

Belfast City

Tue 7/22

6:15 pm-4:59 pm

2 stops30h 44m

$962

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 5/1

2:10 pm-9:15 pm

1 stop23h 05m

Belfast City

Mon 5/12

6:30 am-4:08 pm

2 stops17h 38m

$965

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 5/4

6:08 am-11:30 am

2 stops21h 22m

Belfast City

Sat 5/10

4:15 pm-4:00 pm

2 stops31h 45m

$1,044

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 5/16

3:45 pm-8:05 pm

2 stops20h 20m

Belfast Intl

Fri 5/23

9:05 pm-12:10 am

3 stops35h 05m

$1,048

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 5/3

8:30 am-5:15 pm

2 stops24h 45m

Belfast City

Sun 5/11

6:50 am-6:46 pm

2 stops19h 56m

$1,049

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Fri 5/16

3:20 pm-8:05 pm

2 stops20h 45m

Belfast Intl

Fri 5/23

6:05 am-4:45 pm

3 stops42h 40m

$1,146

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 7/2

7:25 pm-6:40 pm

1 stop15h 15m

Belfast City

Tue 7/15

6:15 pm-11:04 pm

2 stops36h 49m

$1,334

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 18 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 April 2, 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.

Rainfall in Belfast by month

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

In terms of precipitation, rainfall in Belfast ranges from 2.0 - 3.5 inches per month. October is typically the wettest month, when rainfall can reach 3.5 in. April is typically the driest time to visit Belfast when rainfall is around 2.0 in.

Temperature in Belfast by month

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

If weather is an important factor for your trip to Belfast, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 60.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 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 2, 2025.
To help decide which airline to fly from Washington to Belfast, see what other customers have to say about Delta, KLM and Finnair. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,898 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,323 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Aer Lingus
7.0
Good
1,060 reviews
Delta
8.0
Very good
7,898 reviews

Crew

8.5

Entertainment

7.9

Comfort

7.9

Food

7.3

Boarding

8.2

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 $781. However, be on the lookout for offers from American Airlines and Delta, 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

See prices for flight routes from nearby airports that may be better suited for you.
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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 April 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$544Average$928FlexibilityNo cancel feeOn-time70%

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