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 many operators does momondo search for flights from Belfast Intl Airport to Washington?

The number of operators available for flights from Belfast Intl Airport to Washington is 1 as of March 2026.

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.

£626 Cheap Flights from Belfast Intl Airport to State of Washington in 2026

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Find the cheapest flights from Belfast Intl Airport to Washington

Round-trip

Cheap return flights

Enter your travel dates to find the best prices.

07:35 - 17:55

BFS

SEA

18h 20m

2 stops

19:00 - 17:05

SEA

BFS

14h 05m

2 stops

£626Multiple Airlines

Wed, 29 Apr - Wed, 6 May

07:35 - 17:55

BFS

SEA

18h 20m

2 stops

19:00 - 17:05

SEA

BFS

14h 05m

2 stops

£638Multiple Airlines

Wed, 29 Apr - Wed, 6 May

08:20 - 20:40

BFS

SEA

20h 20m

2 stops

19:00 - 20:55

SEA

BFS

17h 55m

2 stops

£669Multiple Airlines

Tue, 12 May - Tue, 19 May

06:15 - 09:40

BFS

SEA

35h 25m

3 stops

19:00 - 23:15

SEA

BFS

20h 15m

3 stops

£702Multiple Airlines

Wed, 29 Apr - Wed, 6 May

06:15 - 09:40

BFS

SEA

35h 25m

3 stops

19:00 - 23:15

SEA

BFS

20h 15m

3 stops

£703Multiple Airlines

Wed, 29 Apr - Wed, 6 May

06:15 - 09:40

BFS

SEA

35h 25m

3 stops

19:00 - 17:05

SEA

BFS

14h 05m

2 stops

£710Multiple Airlines

Wed, 29 Apr - Wed, 6 May

06:15 - 09:40

BFS

SEA

35h 25m

3 stops

19:00 - 17:05

SEA

BFS

14h 05m

2 stops

£711Multiple Airlines

Wed, 29 Apr - Wed, 6 May

09:55 - 20:40

BFS

SEA

18h 45m

2 stops

19:00 - 20:15

SEA

BFS

17h 15m

2 stops

£828Multiple Airlines

Sun, 10 May - Sun, 17 May

06:15 - 18:30

BFS

SEA

20h 15m

3 stops

10:30 - 19:40

SEA

BFS

25h 10m

3 stops

£877Multiple Airlines

Tue, 12 May - Tue, 19 May

08:20 - 17:55

BFS

SEA

17h 35m

2 stops

10:30 - 19:40

SEA

BFS

25h 10m

3 stops

£884Multiple Airlines

Tue, 12 May - Tue, 19 May

momondo Fare Finder

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

Fastest return journey

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 29/4

07:35-17:55

2 stops18h 20m

Seattle/Tacoma Intl

Wed 6/5

19:00-17:05

2 stops14h 05m

£626

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 29/4

07:35-17:55

2 stops18h 20m

Seattle/Tacoma Intl

Wed 6/5

19:00-17:05

2 stops14h 05m

£638

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 12/5

08:20-20:40

2 stops20h 20m

Seattle/Tacoma Intl

Tue 19/5

19:00-20:55

2 stops17h 55m

£669

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 29/4

06:15-09:40

3 stops35h 25m

Seattle/Tacoma Intl

Wed 6/5

19:00-23:15

3 stops20h 15m

£702

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 29/4

06:15-09:40

3 stops35h 25m

Seattle/Tacoma Intl

Wed 6/5

19:00-23:15

3 stops20h 15m

£703

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 29/4

06:15-09:40

3 stops35h 25m

Seattle/Tacoma Intl

Wed 6/5

19:00-17:05

2 stops14h 05m

£710

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Wed 29/4

06:15-09:40

3 stops35h 25m

Seattle/Tacoma Intl

Wed 6/5

19:00-17:05

2 stops14h 05m

£711

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 10/5

09:55-20:40

2 stops18h 45m

Seattle/Tacoma Intl

Sun 17/5

19:00-20:15

2 stops17h 15m

£828

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 12/5

06:15-18:30

3 stops20h 15m

Seattle/Tacoma Intl

Tue 19/5

10:30-19:40

3 stops25h 10m

£877

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Tue 12/5

08:20-17:55

2 stops17h 35m

Seattle/Tacoma Intl

Tue 19/5

10:30-19:40

3 stops25h 10m

£884

Flights are sorted by cheapest return flights first.

Sorted 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	13h 05m
Direct flights	None

The fastest flight from Belfast Intl Airport to State of Washington takes 13h 05m

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

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 many operators does momondo search for flights from Belfast Intl Airport to Washington?
The number of operators available for flights from Belfast Intl Airport to Washington is 1 as of March 2026.
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.

Best airlines flying from Belfast Intl Airport to State of Washington

Compare and see reviews for airlines that fly from Belfast Intl Airport to State of Washington with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom £568	Free Cancellation	Rating 7.1 11,543 reviews		Search American Airlines flights

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.