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.

£235 Cheap Flights from State of Washington to Belfast Intl Airport in 2026

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Find the cheapest flights from Washington to Belfast

Round-trip

One-way

Cheap return flights

Enter your travel dates to find the best prices.

07:00 - 19:40

SEA

BFS

28h 40m

3 stops

06:40 - 20:40

BFS

SEA

22h 00m

2 stops

£714Multiple Airlines

Tue, 8 Sep - Tue, 15 Sep

07:00 - 19:40

SEA

BFS

28h 40m

3 stops

07:00 - 09:40

BFS

SEA

34h 40m

3 stops

£719Multiple Airlines

Tue, 8 Sep - Tue, 15 Sep

19:00 - 22:25

SEA

BFS

19h 25m

2 stops

08:20 - 11:45

BFS

SEA

35h 25m

2 stops

£736Multiple Airlines

Mon, 17 Aug - Tue, 25 Aug

05:45 - 18:25

SEA

BFS

28h 40m

3 stops

06:55 - 22:40

BFS

SEA

23h 45m

3 stops

£764Multiple Airlines

Sun, 7 Jun - Sat, 13 Jun

19:00 - 23:20

SEA

BFS

20h 20m

2 stops

07:00 - 20:40

BFS

SEA

21h 40m

2 stops

£777Multiple Airlines

Tue, 8 Sep - Tue, 15 Sep

15:40 - 23:20

SEA

BFS

23h 40m

3 stops

20:10 - 17:55

BFS

SEA

29h 45m

3 stops

£792Multiple Airlines

Mon, 17 Aug - Tue, 25 Aug

19:10 - 20:55

SEA

BFS

17h 45m

2 stops

20:10 - 17:55

BFS

SEA

29h 45m

3 stops

£794Multiple Airlines

Mon, 17 Aug - Tue, 25 Aug

19:10 - 19:50

SEA

BFS

16h 40m

2 stops

20:15 - 18:55

BFS

SEA

30h 40m

1 stop

£795Multiple Airlines

Tue, 8 Sep - Tue, 15 Sep

19:00 - 22:50

SEA

BFS

19h 50m

2 stops

06:30 - 09:40

BFS

SEA

35h 10m

2 stops

£803Multiple Airlines

Thu, 4 Jun - Mon, 8 Jun

19:00 - 23:25

SEA

BFS

20h 25m

2 stops

06:10 - 17:10

BFS

SEA

43h 00m

3 stops

£816Multiple Airlines

Thu, 8 Oct - Thu, 22 Oct

momondo Fare Finder

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

Cheapest return flight

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 8/9

07:00-19:40

3 stops28h 40m

Belfast Intl

Tue 15/9

06:40-20:40

2 stops22h 00m

£714

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 8/9

07:00-19:40

3 stops28h 40m

Belfast Intl

Tue 15/9

07:00-09:40

3 stops34h 40m

£719

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 17/8

19:00-22:25

2 stops19h 25m

Belfast Intl

Tue 25/8

08:20-11:45

2 stops35h 25m

£736

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 7/6

05:45-18:25

3 stops28h 40m

Belfast Intl

Sat 13/6

06:55-22:40

3 stops23h 45m

£764

Fastest return journey

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 8/9

19:00-23:20

2 stops20h 20m

Belfast Intl

Tue 15/9

07:00-20:40

2 stops21h 40m

£777

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 17/8

15:40-23:20

3 stops23h 40m

Belfast Intl

Tue 25/8

20:10-17:55

3 stops29h 45m

£792

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 17/8

19:10-20:55

2 stops17h 45m

Belfast Intl

Tue 25/8

20:10-17:55

3 stops29h 45m

£794

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 8/9

19:10-19:50

2 stops16h 40m

Belfast Intl

Tue 15/9

20:15-18:55

1 stop30h 40m

£795

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 4/6

19:00-22:50

2 stops19h 50m

Belfast Intl

Mon 8/6

06:30-09:40

2 stops35h 10m

£803

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 8/10

19:00-23:25

2 stops20h 25m

Belfast Intl

Thu 22/10

06:10-17:10

3 stops43h 00m

£816

Flights are sorted by cheapest return flights first.

Showing 1-10 of 17 resultsSorted by cheapest first

How to get the cheapest flight ticket from State of Washington to Belfast Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Belfast Intl Airport?

The month of July is, on average, the cheapest month to fly to Belfast Intl Airport from State of Washington, with most prices found around £0. If you’re not able to fly to Belfast Intl Airport in July, then January is your next best option. Flight prices from State of Washington to Belfast Intl Airport during January average around £0.

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	14h 05m
Direct flights	None

The fastest flight from State of Washington to Belfast Intl Airport takes 14h 05m

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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Frequently asked questions about flying from Washington to Belfast Intl Airport

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.

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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.