Latest deals
FAQs
Price Alerts

Cheap flights from Washington to Belfast from $362

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 2/18. 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

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Washington to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:35 pm - 8:10 pm
SEA
-
BFS
21h 35m
2 stops
Multiple Airlines Logo
8:45 pm - 6:00 pm
BFS
-
SEA
52h 15m
2 stops
$606Multiple Airlines
Sun, Mar 8 - Sun, Mar 15
Multiple Airlines Logo
7:50 pm - 8:10 pm
SEA
-
BFS
17h 20m
1 stop
Multiple Airlines Logo
8:45 pm - 12:24 am
BFS
-
SEA
34h 39m
2 stops
$739Multiple Airlines
Sun, Mar 8 - Sun, Mar 15
Multiple Airlines Logo
7:50 pm - 8:10 pm
SEA
-
BFS
17h 20m
1 stop
Multiple Airlines Logo
8:45 pm - 5:55 pm
BFS
-
SEA
28h 10m
1 stop
$871Multiple Airlines
Sun, Mar 8 - Sun, Mar 15
Multiple Airlines Logo
3:45 pm - 9:50 pm
PDX
-
BFS
23h 05m
3 stops
Multiple Airlines Logo
5:10 pm - 6:00 pm
BFS
-
PDX
32h 50m
3 stops
$933Multiple Airlines
Tue, Mar 24 - Tue, Mar 31
Multiple Airlines Logo
3:30 pm - 8:40 pm
PDX
-
BFS
21h 10m
2 stops
Multiple Airlines Logo
7:20 pm - 9:10 am
BFS
-
PDX
45h 50m
3 stops
$1,030Multiple Airlines
Sat, Apr 4 - Fri, Apr 17
Multiple Airlines Logo
2:00 pm - 10:40 pm
SEA
-
BFS
24h 40m
2 stops
Multiple Airlines Logo
6:25 am - 4:40 pm
BFS
-
SEA
17h 15m
2 stops
$1,034Multiple Airlines
Sat, Mar 7 - Sat, Mar 14
Multiple Airlines Logo
3:45 pm - 9:40 pm
PDX
-
BFS
22h 55m
2 stops
Multiple Airlines Logo
5:10 pm - 6:00 pm
BFS
-
PDX
32h 50m
3 stops
$1,047Multiple Airlines
Tue, Mar 24 - Tue, Mar 31
Multiple Airlines Logo
3:00 pm - 10:35 pm
SEA
-
BFS
24h 35m
3 stops
Multiple Airlines Logo
7:35 pm - 8:40 pm
BFS
-
SEA
33h 05m
3 stops
$1,048Multiple Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
8:00 am - 9:40 pm
SEA
-
BFS
30h 40m
2 stops
Multiple Airlines Logo
7:35 pm - 8:40 pm
BFS
-
SEA
33h 05m
3 stops
$1,063Multiple Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
9:05 pm - 10:35 pm
SEA
-
BFS
18h 30m
2 stops
Multiple Airlines Logo
6:10 am - 5:10 pm
BFS
-
SEA
19h 00m
2 stops
$1,145Multiple Airlines
Mon, Mar 23 - Mon, Mar 30

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 February 7, 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

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 3/8

3:35 pm-8:10 pm

2 stops21h 35m

Belfast Intl

Sun 3/15

8:45 pm-6:00 pm

2 stops52h 15m

$606

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 3/8

7:50 pm-8:10 pm

1 stop17h 20m

Belfast Intl

Sun 3/15

8:45 pm-12:24 am

2 stops34h 39m

$739

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sun 3/8

7:50 pm-8:10 pm

1 stop17h 20m

Belfast Intl

Sun 3/15

8:45 pm-5:55 pm

1 stop28h 10m

$871

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Tue 3/24

3:45 pm-9:50 pm

3 stops23h 05m

Belfast Intl

Tue 3/31

5:10 pm-6:00 pm

3 stops32h 50m

$933

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Sat 4/4

3:30 pm-8:40 pm

2 stops21h 10m

Belfast Intl

Fri 4/17

7:20 pm-9:10 am

3 stops45h 50m

$1,030

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Sat 3/7

2:00 pm-10:40 pm

2 stops24h 40m

Belfast Intl

Sat 3/14

6:25 am-4:40 pm

2 stops17h 15m

$1,034

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Tue 3/24

3:45 pm-9:40 pm

2 stops22h 55m

Belfast Intl

Tue 3/31

5:10 pm-6:00 pm

3 stops32h 50m

$1,047

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 3/23

3:00 pm-10:35 pm

3 stops24h 35m

Belfast Intl

Mon 3/30

7:35 pm-8:40 pm

3 stops33h 05m

$1,048

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 3/23

8:00 am-9:40 pm

2 stops30h 40m

Belfast Intl

Mon 3/30

7:35 pm-8:40 pm

3 stops33h 05m

$1,063

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Mon 3/23

9:05 pm-10:35 pm

2 stops18h 30m

Belfast Intl

Mon 3/30

6:10 am-5:10 pm

2 stops19h 00m

$1,145

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 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 35m

Direct flights

None
The fastest flight from State of Washington to Belfast Intl Airport takes 12h 35m
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.
Search flight deals

  • 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.

  • 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
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.

An easier way to manage your Belfast Intl Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Mon 3/9
Mon 3/16
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Belfast

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
Flights to London Heathrow Airportfrom $379
Flights to London Gatwick Airportfrom $352
Flights to London City Airportfrom $484
Flights to London Stansted Airportfrom $343
Flights to London Luton Airportfrom $343
Flights to Glasgow Intl Airportfrom $394
Flights to London Southend Airportfrom $472
Flights to Belfast City Airportfrom $553