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Cheap flights from Washington to Belfast from $291

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 8/2. 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
1 adult, Economy, 0 bags

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Find the cheapest flights from Washington to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:40 pm - 9:30 pm
SEA
-
BFS
21h 50m
3 stops
Multiple Airlines Logo
5:30 pm - 8:40 pm
BFS
-
SEA
35h 10m
3 stops
$893Multiple Airlines
Sun, Aug 23 - Fri, Aug 28
Multiple Airlines Logo
3:40 pm - 10:50 pm
SEA
-
BFS
23h 10m
3 stops
Multiple Airlines Logo
8:50 pm - 5:10 pm
BFS
-
SEA
28h 20m
2 stops
$946Multiple Airlines
Sun, Aug 23 - Fri, Aug 28
Multiple Airlines Logo
3:40 pm - 9:20 pm
SEA
-
BFS
21h 40m
2 stops
Multiple Airlines Logo
7:15 am - 5:55 pm
BFS
-
SEA
18h 40m
2 stops
$952Multiple Airlines
Sun, Aug 23 - Fri, Aug 28
Multiple Airlines Logo
3:40 pm - 8:40 pm
SEA
-
BFS
21h 00m
2 stops
Multiple Airlines Logo
10:25 pm - 9:40 am
BFS
-
SEA
43h 15m
3 stops
$957Multiple Airlines
Sat, Sep 19 - Sat, Sep 26
Multiple Airlines Logo
3:40 pm - 12:15 pm
SEA
-
BFS
36h 35m
2 stops
Multiple Airlines Logo
7:35 am - 7:00 pm
BFS
-
SEA
19h 25m
1 stop
$966Multiple Airlines
Sun, Aug 23 - Fri, Aug 28
Multiple Airlines Logo
7:00 pm - 10:40 pm
SEA
-
BFS
19h 40m
2 stops
Multiple Airlines Logo
9:40 am - 8:40 pm
BFS
-
SEA
19h 00m
2 stops
$1,000Multiple Airlines
Sat, Sep 19 - Sat, Sep 26
Multiple Airlines Logo
7:05 pm - 9:30 pm
PDX
-
BFS
18h 25m
3 stops
Multiple Airlines Logo
7:05 am - 1:50 pm
BFS
-
PDX
38h 45m
3 stops
$1,008Multiple Airlines
Sun, Aug 23 - Fri, Aug 28
Multiple Airlines Logo
7:00 pm - 3:50 pm
SEA
-
BFS
12h 50m
2 stops
Multiple Airlines Logo
6:40 am - 9:40 am
BFS
-
SEA
35h 00m
3 stops
$1,011Multiple Airlines
Thu, Aug 6 - Thu, Aug 13
Multiple Airlines Logo
7:00 pm - 11:30 pm
SEA
-
BFS
20h 30m
3 stops
Multiple Airlines Logo
6:40 am - 10:07 am
BFS
-
SEA
35h 27m
3 stops
$1,031Multiple Airlines
Thu, Aug 6 - Thu, Aug 13
Multiple Airlines Logo
5:50 am - 9:35 am
SEA
-
BFS
19h 45m
3 stops
Multiple Airlines Logo
10:25 pm - 9:40 am
BFS
-
SEA
43h 15m
3 stops
$1,039Multiple Airlines
Sat, Sep 19 - Sat, Sep 26

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Customize 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 832,500 searches. Data last updated June 23, 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

Cheapest round-trip

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 8/23

3:40 pm-9:30 pm

3 stops21h 50m

Belfast Intl

Fri 8/28

5:30 pm-8:40 pm

3 stops35h 10m

$893

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 8/23

3:40 pm-10:50 pm

3 stops23h 10m

Belfast Intl

Fri 8/28

8:50 pm-5:10 pm

2 stops28h 20m

$946

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 8/23

3:40 pm-9:20 pm

2 stops21h 40m

Belfast Intl

Fri 8/28

7:15 am-5:55 pm

2 stops18h 40m

$952

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 9/19

3:40 pm-8:40 pm

2 stops21h 00m

Belfast Intl

Sat 9/26

10:25 pm-9:40 am

3 stops43h 15m

$957

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 8/23

3:40 pm-12:15 pm

2 stops36h 35m

Belfast Intl

Fri 8/28

7:35 am-7:00 pm

1 stop19h 25m

$966
Quickest round-trip

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 9/19

7:00 pm-10:40 pm

2 stops19h 40m

Belfast Intl

Sat 9/26

9:40 am-8:40 pm

2 stops19h 00m

$1,000

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sun 8/23

7:05 pm-9:30 pm

3 stops18h 25m

Belfast Intl

Fri 8/28

7:05 am-1:50 pm

3 stops38h 45m

$1,008

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 8/6

7:00 pm-3:50 pm

2 stops12h 50m

Belfast Intl

Thu 8/13

6:40 am-9:40 am

3 stops35h 00m

$1,011

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Thu 8/6

7:00 pm-11:30 pm

3 stops20h 30m

Belfast Intl

Thu 8/13

6:40 am-10:07 am

3 stops35h 27m

$1,031

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 9/19

5:50 am-9:35 am

3 stops19h 45m

Belfast Intl

Sat 9/26

10:25 pm-9:40 am

3 stops43h 15m

$1,039

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 14 resultsSorted by cheapest first
1
2

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 50m

Direct flights

None
The fastest flight from State of Washington to Belfast Intl Airport takes 12h 50m
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 are refreshed on a daily basis.

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

  • 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.

Best airlines flying from State of Washington to Belfast Intl Airport

Compare and see reviews for airlines that fly from State of Washington to Belfast Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $807Free CancellationRating
6.7
8,065 reviews
Search British Airways flights

Frequently asked questions about flying from Washington to Belfast Intl Airport

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

    Search flight deals from State of Washington to Belfast Intl Airport. While viewing offers you’ll have the option to create a Price Alert.

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

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • 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.

Traveling to a place near Belfast?

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

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Washington to Belfast. Millions of users trust and use momondo every year so you are in good hands.

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

Yes. momondo allows you to filter the results for Washington to Belfast flights to just show those with flexible booking policies.

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

Once you have performed a search for Washington to Belfast 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 Washington to Belfast right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Washington to Belfast flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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