Latest deals
Insights
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
British Airways Logo
6:50 pm - 4:45 pm
SEA
-
BHD
13h 55m
1 stop
British Airways Logo
9:15 am - 5:55 pm
BHD
-
SEA
15h 40m
1 stop
$624British Airways
Sat, Mar 7 - Wed, Mar 18
British Airways Logo
6:50 pm - 7:40 pm
SEA
-
BHD
16h 50m
1 stop
British Airways Logo
11:25 am - 5:55 pm
BHD
-
SEA
13h 30m
1 stop
$625British Airways
Sat, Mar 7 - Wed, Mar 18
British Airways Logo
1:35 pm - 2:15 pm
SEA
-
BHD
16h 40m
1 stop
British Airways Logo
11:25 am - 5:55 pm
BHD
-
SEA
13h 30m
1 stop
$626British Airways
Sat, Mar 7 - Tue, Mar 17
British Airways Logo
6:50 pm - 7:40 pm
SEA
-
BHD
16h 50m
1 stop
British Airways Logo
6:35 am - 11:04 pm
BHD
-
SEA
23h 29m
2 stops
$630British Airways
Sat, Mar 7 - Tue, Mar 17
British Airways Logo
6:50 pm - 7:40 pm
SEA
-
BHD
16h 50m
1 stop
British Airways Logo
6:35 am - 11:04 pm
BHD
-
SEA
23h 29m
2 stops
$631British Airways
Sat, Mar 7 - Tue, Mar 17
British Airways Logo
6:50 pm - 7:40 pm
SEA
-
BHD
16h 50m
1 stop
British Airways Logo
11:25 am - 12:24 am
BHD
-
SEA
19h 59m
2 stops
$639British Airways
Sat, Mar 7 - Wed, Mar 18
British Airways Logo
6:50 pm - 7:30 am
SEA
-
BHD
28h 40m
1 stop
British Airways Logo
3:10 pm - 5:55 pm
BHD
-
SEA
33h 45m
1 stop
$640British Airways
Wed, Mar 4 - Sun, Mar 8
American Airlines Logo
11:48 am - 2:15 pm
PDX
-
BHD
18h 27m
2 stops
American Airlines Logo
8:45 am - 8:44 pm
BHD
-
PDX
19h 59m
2 stops
$693American Airlines
Wed, Feb 25 - Tue, Mar 3
Multiple Airlines Logo
1:25 pm - 4:50 pm
PDX
-
BHD
19h 25m
1 stop
Multiple Airlines Logo
5:20 pm - 11:25 am
BHD
-
PDX
26h 05m
1 stop
$700Multiple Airlines
Wed, Feb 25 - Tue, Mar 3

British Airways flights from State of Washington to Belfast

Our best British Airways deals on State of Washington to Belfast flight tickets
British Airways
Mar 7
SEA6:50 pmSeattle/Tacoma Intl
16h 50m
1 stop
BHD7:40 pmBelfast City
Mar 17
BHD6:35 amBelfast City
18h 20m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$624
British Airways
Mar 7
SEA6:50 pmSeattle/Tacoma Intl
16h 50m
1 stop
BHD7:40 pmBelfast City
Mar 17
BHD8:45 amBelfast City
16h 10m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$625
British Airways
Mar 7
SEA1:35 pmSeattle/Tacoma Intl
16h 40m
1 stop
BHD2:15 pmBelfast City
Mar 17
BHD11:25 amBelfast City
13h 30m
1 stop
SEA5:55 pmSeattle/Tacoma Intl
$626

Aer Lingus flights from State of Washington to Belfast

Our best Aer Lingus deals on State of Washington to Belfast flight tickets
Aer Lingus
Mar 23
SEA9:05 pmSeattle/Tacoma Intl
16h 50m
2 stops
BHD8:55 pmBelfast City
Mar 27
BHD8:45 amBelfast City
17h 35m
2 stops
SEA7:20 pmSeattle/Tacoma Intl
$1,064
Aer Lingus
Mar 23
SEA9:05 pmSeattle/Tacoma Intl
15h 50m
2 stops
BHD7:55 pmBelfast City
Mar 27
BHD8:45 amBelfast City
17h 35m
2 stops
SEA7:20 pmSeattle/Tacoma Intl
$1,131
Aer Lingus
Mar 23
SEA9:05 pmSeattle/Tacoma Intl
16h 50m
2 stops
BHD8:55 pmBelfast City
Mar 27
BHD8:45 amBelfast City
17h 35m
2 stops
SEA7:20 pmSeattle/Tacoma Intl
$1,137

momondo Fare Finder

 
Customize your flight search to find flights from State of Washington to Belfast 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 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 - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-4:45 pm

1 stop13h 55m

Belfast City

Wed 3/18

9:15 am-5:55 pm

1 stop15h 40m

$624

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-7:40 pm

1 stop16h 50m

Belfast City

Wed 3/18

11:25 am-5:55 pm

1 stop13h 30m

$625

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

1:35 pm-2:15 pm

1 stop16h 40m

Belfast City

Tue 3/17

11:25 am-5:55 pm

1 stop13h 30m

$626

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-7:40 pm

1 stop16h 50m

Belfast City

Tue 3/17

6:35 am-11:04 pm

2 stops23h 29m

$630

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-7:40 pm

1 stop16h 50m

Belfast City

Tue 3/17

6:35 am-11:04 pm

2 stops23h 29m

$631

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

6:50 pm-7:40 pm

1 stop16h 50m

Belfast City

Wed 3/18

11:25 am-12:24 am

2 stops19h 59m

$639

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 3/4

6:50 pm-7:30 am

1 stop28h 40m

Belfast City

Sun 3/8

3:10 pm-5:55 pm

1 stop33h 45m

$640

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 2/25

11:48 am-2:15 pm

2 stops18h 27m

Belfast City

Tue 3/3

8:45 am-8:44 pm

2 stops19h 59m

$693

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 2/25

1:25 pm-4:50 pm

1 stop19h 25m

Belfast City

Tue 3/3

5:20 pm-11:25 am

1 stop26h 05m

$700

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

See travel insights to Belfast from

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

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 airline that flies from Washington to Belfast?

British Airways is the most popular carrier operating from Washington to Belfast

Cheap State of Washington to Belfast flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from State of Washington to Belfast

Fastest flight time

12h 35m

Direct flights

None
The fastest flight from State of Washington to Belfast takes 12h 35m
There are no direct flights from State of Washington to Belfast. There are no popular flight routes from State of Washington to Belfast.
Search flight deals

  • When did momondo last update prices for flights from Washington to Belfast?

    Prices for flights from Washington to Belfast are refreshed on a daily basis.

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

  • How old do you have to be to fly from Washington to Belfast?

    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.

  • What documentation or ID do you need to fly to Belfast?

    The necessary travel and health documents for your Belfast 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.

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Washington to Belfast. momondo saves you time and could save you money on your trip.

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 in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Belfast from Washington.

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.

An easier way to manage your Belfast 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 the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport