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Cheap flights from Washington to Belfast from £501

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 25/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
7 Apr — 14 Apr1
1 adult

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 2 April 2025.

Round-trip from

£599

Popular in

June

Cheapest in

October

Average price

£649
British Airways
  • British Airways
  • 30/4-12/5
  • 2 total stops
  • 39h 00m total
  • Washington to Belfast
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (£119 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£32 potential savings vs. average return 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 2 April 2025.

Sat 25/1023:59PDX - BHD
2 stops27h 21mBritish Airways
Tue 4/1108:40BHD - PDX
2 stops22h 12mBritish Airways
Deal found 1/4£501
Sat 25/1019:25PDX - BHD
1 stop14h 15mMultiple Airlines
Tue 4/1108:40BHD - PDX
2 stops21h 21mMultiple Airlines
Deal found 1/4£529
Tue 28/1014:35SEA - BHD
1 stop16h 00mMultiple Airlines
Tue 4/1106:35BHD - SEA
1 stop12h 45mMultiple Airlines
Deal found 2/4£540
Tue 28/1015:13SEA - BHD
2 stops16h 42mAmerican Airlines
Tue 4/1111:30BHD - SEA
2 stops19h 45mAmerican Airlines
Deal found 2/4£558
Sat 25/1013:15PDX - BHD
1 stop24h 45mKLM
Tue 4/1117:20BHD - PDX
1 stop26h 05mKLM
Deal found 1/4£567
Wed 30/420:20SEA - BHD
1 stop14h 20mBritish Airways
Mon 12/518:30BHD - SEA
1 stop24h 40mBritish Airways
Deal found 1/4£599
Sun 4/509:25SEA - BHD
2 stops27h 50mDelta
Mon 12/517:25BHD - SEA
1 stop26h 15mDelta
Deal found 1/4£680
Tue 15/718:45SEA - BHD
2 stops17h 10mAer Lingus
Tue 22/718:15BHD - SEA
2 stops30h 44mAer Lingus
Deal found 1/4£745
Thu 1/514:10SEA - BHD
1 stop23h 05mKLM
Mon 12/506:30BHD - SEA
2 stops17h 38mKLM
Deal found 1/4£747
Sat 25/1015:20PDX - BFS
2 stops23h 00mMultiple Airlines
Tue 4/1110:40BFS - PDX
2 stops38h 20mMultiple Airlines
Deal found 1/4£784
Sun 4/506:08SEA - BHD
2 stops21h 22mFinnair
Sat 10/516:15BHD - SEA
2 stops31h 45mFinnair
Deal found 1/4£808
Fri 16/515:45SEA - BFS
2 stops20h 20mMultiple Airlines
Fri 23/521:05BFS - SEA
3 stops35h 05mMultiple Airlines
Deal found 1/4£811

Cheapflights Fare Finder

Customise 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 858,174 searches. Data last updated 2 April 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 30/4

20:20-18:40

1 stop14h 20m

Belfast City

Mon 12/5

18:30-11:10

1 stop24h 40m

£599

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Fri 2/5

13:35-15:30

2 stops17h 55m

Belfast City

Sun 11/5

15:50-11:35

1 stop27h 45m

£628

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 4/5

09:25-21:15

2 stops27h 50m

Belfast City

Mon 12/5

17:25-11:40

1 stop26h 15m

£680

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 15/7

18:45-19:55

2 stops17h 10m

Belfast City

Tue 22/7

18:15-16:59

2 stops30h 44m

£745

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Thu 1/5

14:10-21:15

1 stop23h 05m

Belfast City

Mon 12/5

06:30-16:08

2 stops17h 38m

£747

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sun 4/5

06:08-11:30

2 stops21h 22m

Belfast City

Sat 10/5

16:15-16:00

2 stops31h 45m

£808

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Fri 16/5

15:45-20:05

2 stops20h 20m

Belfast Intl

Fri 23/5

21:05-00:10

3 stops35h 05m

£811

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/5

08:30-17:15

2 stops24h 45m

Belfast City

Sun 11/5

06:50-18:46

2 stops19h 56m

£812

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Fri 16/5

15:20-20:05

2 stops20h 45m

Belfast Intl

Fri 23/5

06:05-16:45

3 stops42h 40m

£887

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 2/7

19:25-18:40

1 stop15h 15m

Belfast City

Tue 15/7

18:15-23:04

2 stops36h 49m

£1,032

Flights are sorted by cheapest return flights first.

Deals found on 1/4

Showing 1-10 of 16 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 return 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

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 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast when rainfall is around 50.0 mm.

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 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

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 2 April 2025.
Get a feel of what it's like to fly with Delta, KLM and Finnair from Washington to Belfast by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,897 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

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
7,897 reviews
Delta
8.0
Very Good
7,897 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

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
7,897 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

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
7,897 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

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
7,897 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

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
7,897 reviews
Check prices

Boarding

8.2

Overall

8.0

Comfort

7.9

Food

7.3

Crew

8.5

Entertainment

7.9

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?

    One-way options have recently been found by users for as low as £604 on British Airways. Other airlines that offer cheap prices include American Airlines from £621 and Delta from £1,170 one-way.

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

    When deciding which route to take from State of Washington to Belfast consider Seattle/Tacoma Intl - Belfast Intl, Seattle/Tacoma Intl - Belfast City or Portland - Belfast Intl as they are the most popular.

  • 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 holiday 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, January is the cheapest month in which you can book a flight from State of Washington to Belfast (average of £67). Flying from State of Washington to Belfast in July is currently the most expensive (average of £90). 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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Fly with Cheapflights

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How does Cheapflights help users find flights from Washington to Belfast?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Washington to Belfast. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

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 Belfast from Washington.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Washington to Belfast, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Washington 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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