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Cheap flights from Washington to Belfast from £266

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington to Belfast departing on 18/2. 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
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Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
15:35 - 20:10
SEA
-
BFS
21h 35m
2 stops
Multiple Airlines Logo
20:45 - 18:00
BFS
-
SEA
52h 15m
2 stops
£446Multiple Airlines
Sun, 8 Mar - Sun, 15 Mar
Multiple Airlines Logo
19:50 - 20:10
SEA
-
BFS
17h 20m
1 stop
Multiple Airlines Logo
20:45 - 00:24
BFS
-
SEA
34h 39m
2 stops
£544Multiple Airlines
Sun, 8 Mar - Sun, 15 Mar
Multiple Airlines Logo
19:50 - 20:10
SEA
-
BFS
17h 20m
1 stop
Multiple Airlines Logo
20:45 - 17:55
BFS
-
SEA
28h 10m
1 stop
£641Multiple Airlines
Sun, 8 Mar - Sun, 15 Mar
Multiple Airlines Logo
15:45 - 21:50
PDX
-
BFS
23h 05m
3 stops
Multiple Airlines Logo
17:10 - 18:00
BFS
-
PDX
32h 50m
3 stops
£687Multiple Airlines
Tue, 24 Mar - Tue, 31 Mar
Multiple Airlines Logo
15:30 - 20:40
PDX
-
BFS
21h 10m
2 stops
Multiple Airlines Logo
19:20 - 09:10
BFS
-
PDX
45h 50m
3 stops
£758Multiple Airlines
Sat, 4 Apr - Fri, 17 Apr
Multiple Airlines Logo
14:00 - 22:40
SEA
-
BFS
24h 40m
2 stops
Multiple Airlines Logo
06:25 - 16:40
BFS
-
SEA
17h 15m
2 stops
£761Multiple Airlines
Sat, 7 Mar - Sat, 14 Mar
Multiple Airlines Logo
15:45 - 21:40
PDX
-
BFS
22h 55m
2 stops
Multiple Airlines Logo
17:10 - 18:00
BFS
-
PDX
32h 50m
3 stops
£771Multiple Airlines
Tue, 24 Mar - Tue, 31 Mar
Multiple Airlines Logo
15:00 - 22:35
SEA
-
BFS
24h 35m
3 stops
Multiple Airlines Logo
19:35 - 20:40
BFS
-
SEA
33h 05m
3 stops
£771Multiple Airlines
Mon, 23 Mar - Mon, 30 Mar
Multiple Airlines Logo
08:00 - 21:40
SEA
-
BFS
30h 40m
2 stops
Multiple Airlines Logo
19:35 - 20:40
BFS
-
SEA
33h 05m
3 stops
£783Multiple Airlines
Mon, 23 Mar - Mon, 30 Mar
Multiple Airlines Logo
21:05 - 22:35
SEA
-
BFS
18h 30m
2 stops
Multiple Airlines Logo
06:10 - 17:10
BFS
-
SEA
19h 00m
2 stops
£843Multiple Airlines
Mon, 23 Mar - Mon, 30 Mar

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 7 February 2026.
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

Sun 8/3

15:35-20:10

2 stops21h 35m

Belfast Intl

Sun 15/3

20:45-18:00

2 stops52h 15m

£446

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 8/3

19:50-20:10

1 stop17h 20m

Belfast Intl

Sun 15/3

20:45-00:24

2 stops34h 39m

£544

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 8/3

19:50-20:10

1 stop17h 20m

Belfast Intl

Sun 15/3

20:45-17:55

1 stop28h 10m

£641

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Tue 24/3

15:45-21:50

3 stops23h 05m

Belfast Intl

Tue 31/3

17:10-18:00

3 stops32h 50m

£687

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sat 4/4

15:30-20:40

2 stops21h 10m

Belfast Intl

Fri 17/4

19:20-09:10

3 stops45h 50m

£758

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 7/3

14:00-22:40

2 stops24h 40m

Belfast Intl

Sat 14/3

06:25-16:40

2 stops17h 15m

£761

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Tue 24/3

15:45-21:40

2 stops22h 55m

Belfast Intl

Tue 31/3

17:10-18:00

3 stops32h 50m

£771

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 23/3

15:00-22:35

3 stops24h 35m

Belfast Intl

Mon 30/3

19:35-20:40

3 stops33h 05m

£771

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 23/3

08:00-21:40

2 stops30h 40m

Belfast Intl

Mon 30/3

19:35-20:40

3 stops33h 05m

£782

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 23/3

21:05-22:35

2 stops18h 30m

Belfast Intl

Mon 30/3

06:10-17:10

2 stops19h 00m

£843

Flights are sorted by cheapest return flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
1
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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 35m

Direct flights

None
The fastest flight from State of Washington to Belfast Intl Airport takes 12h 35m
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.
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  • 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
Portadown
Dungannon

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

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