Latest deals
FAQs
Price Alerts

Cheap flights from Washington to Belfast from £537

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Belfast departing on 2/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags
Voted winner of Europe's Best Travel App 2023

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Washington to Belfast

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
14:35 - 20:10
SEA
-
BFS
21h 35m2 stops
Multiple Airlines Logo
06:30 - 17:00
BFS
-
SEA
18h 30m2 stops
£537Multiple Airlines
Mon, 2 Feb - Mon, 9 Feb
Multiple Airlines Logo
14:35 - 20:20
SEA
-
BFS
21h 45m2 stops
Multiple Airlines Logo
20:45 - 12:10
BFS
-
SEA
23h 25m2 stops
£669Multiple Airlines
Sun, 18 Jan - Sun, 1 Feb
Multiple Airlines Logo
16:45 - 21:55
SEA
-
BFS
21h 10m1 stop
Multiple Airlines Logo
15:45 - 14:19
BFS
-
SEA
54h 34m2 stops
£680Multiple Airlines
Sun, 18 Jan - Sun, 1 Feb
Multiple Airlines Logo
14:35 - 15:35
SEA
-
BFS
17h 00m2 stops
Multiple Airlines Logo
22:45 - 15:40
BFS
-
SEA
24h 55m3 stops
£720Multiple Airlines
Sun, 18 Jan - Sun, 1 Feb
Multiple Airlines Logo
14:35 - 19:10
SEA
-
BFS
20h 35m3 stops
Multiple Airlines Logo
08:15 - 17:00
BFS
-
SEA
16h 45m2 stops
£736Multiple Airlines
Mon, 2 Feb - Mon, 9 Feb
Multiple Airlines Logo
14:35 - 19:10
SEA
-
BFS
20h 35m3 stops
Multiple Airlines Logo
21:15 - 17:00
BFS
-
SEA
27h 45m3 stops
£778Multiple Airlines
Mon, 2 Feb - Mon, 9 Feb
Multiple Airlines Logo
13:25 - 13:40
PDX
-
BFS
16h 15m1 stop
Multiple Airlines Logo
20:45 - 19:50
BFS
-
PDX
55h 05m2 stops
£1,280Multiple Airlines
Sun, 1 Feb - Sun, 8 Feb

momondo Fare Finder

 
Customise your flight search to find flights from State of Washington to Belfast Intl Airport 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, momondo users made 279,928 searches. Data last updated 20 December 2025.
Use the filters below to find and compare flights from Washington to Belfast Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 2/2

14:35-20:10

2 stops21h 35m

Belfast Intl

Mon 9/2

06:30-17:00

2 stops18h 30m

£537

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 18/1

14:35-20:20

2 stops21h 45m

Belfast Intl

Sun 1/2

20:45-12:10

2 stops23h 25m

£669

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 18/1

16:45-21:55

1 stop21h 10m

Belfast Intl

Sun 1/2

15:45-14:19

2 stops54h 34m

£680

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 18/1

14:35-15:35

2 stops17h 00m

Belfast Intl

Sun 1/2

22:45-15:40

3 stops24h 55m

£720

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 2/2

14:35-19:10

3 stops20h 35m

Belfast Intl

Mon 9/2

08:15-17:00

2 stops16h 45m

£736

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 2/2

14:35-19:10

3 stops20h 35m

Belfast Intl

Mon 9/2

21:15-17:00

3 stops27h 45m

£778

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sun 1/2

13:25-13:40

1 stop16h 15m

Belfast Intl

Sun 8/2

20:45-19:50

2 stops55h 05m

£1,280

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

Cheap State of Washington to Belfast Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Belfast Intl Airport

Fastest flight time

12h 55m

Direct flights

None
The fastest flight from State of Washington to Belfast Intl Airport takes 12h 55m
There are no direct flights from State of Washington to Belfast Intl Airport. There are no popular flight routes from State of Washington to Belfast Intl Airport.
Search flight deals

  • When did momondo last update prices for flights from Washington to Belfast Intl Airport?

    Prices for flights from Washington to Belfast Intl Airport refresh daily.

  • How old do you have to be to fly from Washington to Belfast Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington to Belfast Intl Airport.

  • What documentation or ID do you need to fly to Belfast Intl Airport?

    The travel and health documents required for your trip to Belfast Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Belfast Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • How do I get Price Alerts for flights from State of Washington to Belfast Intl Airport?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to State of Washington from Belfast Intl Airport. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from State of Washington to Belfast Intl Airport with momondo?

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • How does momondo find its flight prices?

    We compare prices from 700+ competitors to help you find the price that works best for you. momondo operates in over 30 international markets, bringing you access to a wide range of fares and deals. Search for your travel using momondo for a diverse range of options from airlines and OTAs.

Travelling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Ballymena
Newry
Armagh
Cookstown
Dungannon
Portadown

Why use momondo?

Why should I use momondo to find a flight deal from Washington to Belfast?

It is quick and easy to find Washington to Belfast flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Belfast that suits you.

Can I find flights from Washington to Belfast with flexible booking policies on momondo?

All flight searches from Washington to Belfast on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Washington to Belfast?

momondo helps you find the best flight between Washington and Belfast by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Washington to Belfast right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Belfast, momondo offers a useful price alert feature which will track prices for flights to Belfast from Washington and alert you when they change.

An easier way to manage your Belfast Intl Airport trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 19/1
Mon 26/1
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Belfast