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

Price Alerts will notify you by email when the price for flights to State of Washington from Belfast Intl Airport decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

How does momondo find its flight prices?

momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast Intl Airport to Washington.

What documentation or ID do you need to fly to Washington?

The necessary travel and health documents for your Washington trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

£325 Cheap Flights from Belfast Intl Airport to State of Washington in 2026

Find the cheapest flights from Belfast Intl Airport to Washington

Return

One-way

Cheap return flights

Enter your travel dates to find the best prices.

08:20 - 20:40BFS Belfast Intl-SEA Seattle/Tacoma Intl

20h 20m2 stops London Gatwick Reykjavik Keflavik Intl

19:00 - 21:05SEA Seattle/Tacoma Intl-BFS Belfast Intl

18h 05m2 stops Reykjavik Keflavik Intl London Gatwick

£576Multiple Airlines

Tue, 29 Sep - Tue, 6 Oct

21:10 - 09:40BFS Belfast Intl-SEA Seattle/Tacoma Intl

44h 30m3 stops London Gatwick Toronto Pearson Intl Calgary

15:40 - 21:00SEA Seattle/Tacoma Intl-BFS Belfast Intl

21h 20m2 stops Reykjavik Keflavik Intl Glasgow Intl

£654Multiple Airlines

Sun, 27 Sep - Sun, 4 Oct

21:10 - 09:40BFS Belfast Intl-SEA Seattle/Tacoma Intl

44h 30m3 stops London Gatwick Toronto Pearson Intl Calgary

15:40 - 20:55SEA Seattle/Tacoma Intl-BFS Belfast Intl

21h 15m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Edinburgh Turnhouse

£666Multiple Airlines

Sun, 27 Sep - Sun, 4 Oct

21:15 - 18:45BFS Belfast Intl-SEA Seattle/Tacoma Intl

29h 30m3 stops Glasgow Intl Toronto Pearson Intl Calgary

19:00 - 21:20SEA Seattle/Tacoma Intl-BFS Belfast Intl

18h 20m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Manchester

£669Multiple Airlines

Tue, 29 Sep - Tue, 6 Oct

21:15 - 18:45BFS Belfast Intl-SEA Seattle/Tacoma Intl

29h 30m3 stops Glasgow Intl Toronto Pearson Intl Calgary

19:00 - 21:05SEA Seattle/Tacoma Intl-BFS Belfast Intl

18h 05m2 stops Reykjavik Keflavik Intl London Gatwick

£672Multiple Airlines

Tue, 29 Sep - Tue, 6 Oct

07:10 - 13:45BFS Belfast Intl-SEA Seattle/Tacoma Intl

14h 35m2 stops Manchester Kastrup Copenhagen

15:55 - 21:30SEA Seattle/Tacoma Intl-BFS Belfast Intl

21h 35m2 stops Kastrup Copenhagen Manchester

£711Multiple Airlines

Sun, 27 Sep - Sun, 4 Oct

20:20 - 16:59BFS Belfast Intl-SEA Seattle/Tacoma Intl

52h 39m2 stops London Stansted Munich Franz Josef Strauss

13:45 - 13:55SEA Seattle/Tacoma Intl-BFS Belfast Intl

16h 10m1 stop Amsterdam Schiphol

£845Multiple Airlines

Sun, 27 Sep - Sun, 4 Oct

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Use the filters below to find and compare flights from Belfast Intl Airport to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 29/9

08:20-20:40

2 stops20h 20m

Seattle/Tacoma Intl

Tue 6/10

19:00-21:05

2 stops18h 05m

£576

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 27/9

21:10-09:40

3 stops44h 30m

Seattle/Tacoma Intl

Sun 4/10

15:40-21:00

2 stops21h 20m

£654

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 27/9

21:10-09:40

3 stops44h 30m

Seattle/Tacoma Intl

Sun 4/10

15:40-20:55

3 stops21h 15m

£666

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 29/9

21:15-18:45

3 stops29h 30m

Seattle/Tacoma Intl

Tue 6/10

19:00-21:20

3 stops18h 20m

£669

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 29/9

21:15-18:45

3 stops29h 30m

Seattle/Tacoma Intl

Tue 6/10

19:00-21:05

2 stops18h 05m

£672

Fastest return journey

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 27/9

07:10-13:45

2 stops14h 35m

Seattle/Tacoma Intl

Sun 4/10

15:55-21:30

2 stops21h 35m

£711

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 27/9

20:20-16:59

2 stops52h 39m

Seattle/Tacoma Intl

Sun 4/10

13:45-13:55

1 stop16h 10m

£845

Cheapest one-way

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Mon 31/8

14:40-13:22

3 stops54h 42m

£325

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Thu 27/8

06:10-09:19

3 stops35h 09m

£460

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Wed 26/8

22:45-18:45

3 stops52h 00m

£464

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 resultsSorted by cheapest first

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

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

Fastest flight time	12h 55m
Direct flights	None

The fastest flight from Belfast Intl Airport to State of Washington takes 12h 55m

There are no direct flights from Belfast Intl Airport to State of Washington. There are no popular flight routes from Belfast Intl Airport to State of Washington.

Search flight deals

Frequently asked questions about flying from Belfast Intl Airport to Washington

When did momondo last update prices for flights from Belfast Intl Airport to Washington?
Prices for flights from Belfast Intl Airport to Washington refresh daily.
How old do you have to be to fly from Belfast Intl Airport to Washington?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Belfast Intl Airport to Washington.
What documentation or ID do you need to fly to Washington?
The necessary travel and health documents for your Washington trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Frequently asked questions about flying from Belfast Intl Airport to Washington

How do I get Price Alerts for flights from Belfast Intl Airport to State of Washington?
Price Alerts will notify you by email when the price for flights to State of Washington from Belfast Intl Airport decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.
How can I save money on flights from Belfast Intl Airport to State of Washington 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?
momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Washington from Belfast.

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

Flights from Belfast to Washington with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once you have performed a search for Belfast to Washington flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

Price alerts on flights to Washington from Belfast are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.