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Cheap flights from Washington to Belfast from $321

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 8/17. 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 round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:40 pm - 9:40 pm
SEA
-
BFS
22h 00m
2 stops
Multiple Airlines Logo
11:30 pm - 9:40 am
BFS
-
SEA
42h 10m
3 stops
$949Multiple Airlines
Thu, Jul 23 - Tue, Jul 28
Multiple Airlines Logo
7:00 am - 7:40 pm
SEA
-
BFS
28h 40m
3 stops
Multiple Airlines Logo
6:40 am - 8:40 pm
BFS
-
SEA
22h 00m
2 stops
$973Multiple Airlines
Tue, Sep 8 - Tue, Sep 15
Multiple Airlines Logo
7:00 am - 7:40 pm
SEA
-
BFS
28h 40m
3 stops
Multiple Airlines Logo
7:00 am - 9:40 am
BFS
-
SEA
34h 40m
3 stops
$980Multiple Airlines
Tue, Sep 8 - Tue, Sep 15
Multiple Airlines Logo
7:00 pm - 10:25 pm
SEA
-
BFS
19h 25m
2 stops
Multiple Airlines Logo
8:20 am - 11:45 am
BFS
-
SEA
35h 25m
2 stops
$1,003Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
5:45 am - 7:50 pm
SEA
-
BFS
30h 05m
3 stops
Multiple Airlines Logo
5:55 am - 6:45 pm
BFS
-
SEA
44h 50m
3 stops
$1,030Multiple Airlines
Tue, Jun 9 - Tue, Jun 16
Multiple Airlines Logo
5:45 am - 6:25 pm
SEA
-
BFS
28h 40m
3 stops
Multiple Airlines Logo
6:55 am - 10:40 pm
BFS
-
SEA
23h 45m
3 stops
$1,042Multiple Airlines
Sun, Jun 7 - Sat, Jun 13
Multiple Airlines Logo
5:45 am - 7:50 pm
SEA
-
BFS
30h 05m
3 stops
Multiple Airlines Logo
5:55 am - 9:08 pm
BFS
-
SEA
23h 13m
2 stops
$1,056Multiple Airlines
Tue, Jun 9 - Tue, Jun 16
Multiple Airlines Logo
7:00 pm - 11:20 pm
SEA
-
BFS
20h 20m
2 stops
Multiple Airlines Logo
7:00 am - 8:40 pm
BFS
-
SEA
21h 40m
2 stops
$1,059Multiple Airlines
Tue, Sep 8 - Tue, Sep 15
Multiple Airlines Logo
3:40 pm - 7:40 pm
SEA
-
BFS
20h 00m
2 stops
Multiple Airlines Logo
10:30 am - 11:45 am
BFS
-
SEA
33h 15m
2 stops
$1,076Multiple Airlines
Tue, Jun 9 - Tue, Jun 16
Multiple Airlines Logo
3:40 pm - 11:20 pm
SEA
-
BFS
23h 40m
3 stops
Multiple Airlines Logo
8:10 pm - 5:55 pm
BFS
-
SEA
29h 45m
3 stops
$1,080Multiple Airlines
Mon, Aug 17 - Tue, Aug 25

momondo Fare Finder

 
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 May 11, 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

Thu 7/23

3:40 pm-9:40 pm

2 stops22h 00m

Belfast Intl

Tue 7/28

11:30 pm-9:40 am

3 stops42h 10m

$949

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 9/8

7:00 am-7:40 pm

3 stops28h 40m

Belfast Intl

Tue 9/15

6:40 am-8:40 pm

2 stops22h 00m

$973

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 9/8

7:00 am-7:40 pm

3 stops28h 40m

Belfast Intl

Tue 9/15

7:00 am-9:40 am

3 stops34h 40m

$980

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 8/17

7:00 pm-10:25 pm

2 stops19h 25m

Belfast Intl

Tue 8/25

8:20 am-11:45 am

2 stops35h 25m

$1,003

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 6/9

5:45 am-7:50 pm

3 stops30h 05m

Belfast Intl

Tue 6/16

5:55 am-6:45 pm

3 stops44h 50m

$1,030

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 6/7

5:45 am-6:25 pm

3 stops28h 40m

Belfast Intl

Sat 6/13

6:55 am-10:40 pm

3 stops23h 45m

$1,042

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 6/9

5:45 am-7:50 pm

3 stops30h 05m

Belfast Intl

Tue 6/16

5:55 am-9:08 pm

2 stops23h 13m

$1,056
Quickest round-trip

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 9/8

7:00 pm-11:20 pm

2 stops20h 20m

Belfast Intl

Tue 9/15

7:00 am-8:40 pm

2 stops21h 40m

$1,059

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Tue 6/9

3:40 pm-7:40 pm

2 stops20h 00m

Belfast Intl

Tue 6/16

10:30 am-11:45 am

2 stops33h 15m

$1,076

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 8/17

3:40 pm-11:20 pm

3 stops23h 40m

Belfast Intl

Tue 8/25

8:10 pm-5:55 pm

3 stops29h 45m

$1,080

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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 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 $776Free CancellationRating
6.7
7,969 reviews
Search British Airways flights

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
Armagh
Cookstown
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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