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Cheap flights from Washington to Belfast from £308

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 23/8. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — BHD
18 Jun — 25 Jun1
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 13 June 2025.

Round-trip from

£492

One-way from

£308

Popular in

August

Cheapest in

March
4/10-14/10
  • 4/10-14/10
  • 4 total stops
  • 63h 25m total
  • Washington to Belfast
Search Deals
23/8
  • 23/8
  • 2 total stops
  • 17h 35m total
  • Washington to Belfast
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£123 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£28 potential savings vs. average return price).
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 13 June 2025.

Sat 4/1015:20PDX - BFS
2 stops24h 05mMultiple Airlines
Tue 14/1010:35BFS - PDX
2 stops39h 20mMultiple Airlines
Deal found 12/6£492
Sat 4/1013:12PDX - BHD
2 stops38h 18mBritish Airways
Tue 14/1020:20BHD - PDX
1 stop29h 15mBritish Airways
Deal found 12/6£497
Wed 15/1019:25PDX - BHD
1 stop15h 15mMultiple Airlines
Sat 25/1009:35BHD - PDX
2 stops21h 08mMultiple Airlines
Deal found 11/6£507
Mon 4/820:20SEA - BHD
1 stop15h 15mBritish Airways
Wed 20/818:15BHD - SEA
1 stop25h 20mBritish Airways
Deal found 12/6£528
Tue 28/1013:29SEA - BHD
2 stops17h 06mAmerican Airlines
Tue 4/1111:30BHD - SEA
1 stop13h 25mAmerican Airlines
Deal found 13/6£539
Sat 4/1015:00SEA - BHD
2 stops36h 30mIberia
Tue 14/1006:35BHD - SEA
1 stop12h 35mIberia
Deal found 12/6£548
Mon 4/817:45SEA - BHD
2 stops15h 45mMultiple Airlines
Wed 20/816:05BHD - SEA
1 stop27h 30mMultiple Airlines
Deal found 12/6£566
Sat 4/1019:00SEA - BFS
2 stops20h 25mMultiple Airlines
Tue 14/1019:55BFS - SEA
2 stops32h 45mMultiple Airlines
Deal found 12/6£582
Mon 4/819:35SEA - BHD
2 stops17h 15mAer Lingus
Wed 20/807:00BHD - SEA
2 stops18h 50mAer Lingus
Deal found 12/6£587
Wed 2/713:15PDX - BHD
1 stop19h 40mKLM
Tue 15/717:25BHD - PDX
1 stop25h 55mKLM
Deal found 11/6£1,155

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 13 June 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

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sat 4/10

15:20-23:25

2 stops24h 05m

Belfast Intl

Tue 14/10

10:35-17:55

2 stops39h 20m

£492

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sat 4/10

13:12-11:30

2 stops38h 18m

Belfast City

Tue 14/10

20:20-17:35

1 stop29h 15m

£497

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 15/10

19:25-18:40

1 stop15h 15m

Belfast City

Sat 25/10

09:35-22:43

2 stops21h 08m

£507

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 4/8

20:20-19:35

1 stop15h 15m

Belfast City

Wed 20/8

18:15-11:35

1 stop25h 20m

£528

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 28/10

13:29-13:35

2 stops17h 06m

Belfast City

Tue 4/11

11:30-16:55

1 stop13h 25m

£539

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 4/10

15:00-11:30

2 stops36h 30m

Belfast City

Tue 14/10

06:35-11:10

1 stop12h 35m

£548

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 4/8

17:45-17:30

2 stops15h 45m

Belfast City

Wed 20/8

16:05-11:35

1 stop27h 30m

£566

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 4/10

19:00-23:25

2 stops20h 25m

Belfast Intl

Tue 14/10

19:55-20:40

2 stops32h 45m

£582

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 4/8

19:35-20:50

2 stops17h 15m

Belfast City

Wed 20/8

07:00-17:50

2 stops18h 50m

£587

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 2/7

13:15-16:55

1 stop19h 40m

Belfast City

Tue 15/7

17:25-11:20

1 stop25h 55m

£1,155

Flights are sorted by cheapest return flights first.

Deals found on 12/6

Showing 1-10 of 12 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 13 June 2025.
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Crew

8.4

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
KLM
7.8
Good
1,358 reviews
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Crew

8.4

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
American Airlines
7.2
Good
10,000 reviews
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Crew

8.4

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Aer Lingus
7.1
Good
1,118 reviews
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Crew

8.4

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Iberia
7.0
Good
2,776 reviews
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Crew

8.4

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
British Airways
6.6
Okay
7,011 reviews
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Crew

8.4

Overall

7.8

Comfort

7.7

Boarding

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.

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 most popular routes from State of Washington to Belfast?

    When deciding which route to take from State of Washington to Belfast consider Portland - Belfast Intl, Portland - Belfast City or Seattle/Tacoma Intl - 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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