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Cheap flights from Washington to Belfast from $214

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 4/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
British Airways Logo
7:50 pm - 6:35 pm
SEA
-
BHD
15h 45m1 stop
British Airways Logo
6:45 am - 12:30 pm
BHD
-
SEA
12h 45m1 stop
$645British Airways
Mon, Mar 23 - Fri, Mar 27
Delta Logo
3:05 pm - 9:00 pm
SEA
-
BHD
21h 55m1 stop
Delta Logo
6:30 am - 12:35 pm
BHD
-
SEA
13h 05m1 stop
$646Delta
Sat, Mar 7 - Tue, Mar 17
Delta Logo
3:05 pm - 9:00 pm
SEA
-
BHD
21h 55m1 stop
Delta Logo
6:30 am - 7:05 pm
BHD
-
SEA
19h 35m2 stops
$656Delta
Sat, Mar 7 - Tue, Mar 17
KLM Logo
5:30 pm - 4:55 pm
SEA
-
BHD
15h 25m1 stop
KLM Logo
5:30 pm - 4:30 pm
BHD
-
SEA
31h 00m1 stop
$660KLM
Wed, Apr 1 - Wed, Apr 8
British Airways Logo
7:50 pm - 4:05 pm
SEA
-
BHD
13h 15m1 stop
British Airways Logo
6:45 am - 12:30 pm
BHD
-
SEA
12h 45m1 stop
$669British Airways
Mon, Mar 23 - Fri, Mar 27
KLM Logo
5:30 pm - 4:55 pm
SEA
-
BHD
15h 25m1 stop
KLM Logo
9:50 am - 12:03 am
BHD
-
SEA
22h 13m2 stops
$670KLM
Wed, Apr 1 - Wed, Apr 8
Multiple Airlines Logo
6:44 am - 10:40 am
SEA
-
BHD
20h 56m2 stops
Multiple Airlines Logo
6:45 am - 12:30 pm
BHD
-
SEA
12h 45m1 stop
$676Multiple Airlines
Mon, Mar 23 - Fri, Mar 27
British Airways Logo
1:37 pm - 4:05 pm
SEA
-
BHD
19h 28m2 stops
British Airways Logo
6:45 am - 12:30 pm
BHD
-
SEA
12h 45m1 stop
$691British Airways
Mon, Mar 23 - Fri, Mar 27
British Airways Logo
7:15 am - 11:55 am
SEA
-
BHD
20h 40m2 stops
British Airways Logo
6:50 am - 9:46 pm
BHD
-
SEA
22h 56m2 stops
$711British Airways
Wed, Apr 1 - Wed, Apr 8
Multiple Airlines Logo
9:50 am - 5:55 pm
PDX
-
BFS
24h 05m3 stops
Multiple Airlines Logo
10:10 am - 9:15 am
BFS
-
PDX
31h 05m3 stops
$1,045Multiple Airlines
Wed, Feb 4 - Wed, Feb 11

Delta flights from State of Washington to Belfast

Our best Delta deals on State of Washington to Belfast flight tickets
Delta
Mar 7
SEA3:05 pmSeattle/Tacoma Intl
21h 55m
1 stop
BHD9:00 pmBelfast City
Mar 17
BHD6:30 amBelfast City
13h 05m
1 stop
SEA12:35 pmSeattle/Tacoma Intl
$646
Find similar
Delta
Mar 7
SEA3:05 pmSeattle/Tacoma Intl
21h 55m
1 stop
BHD9:00 pmBelfast City
Mar 17
BHD6:30 amBelfast City
19h 35m
2 stops
SEA7:05 pmSeattle/Tacoma Intl
$656
Find similar
Delta
Mar 7
SEA7:30 amSeattle/Tacoma Intl
25h 20m
2 stops
BHD4:50 pmBelfast City
Mar 18
BHD6:30 amBelfast City
20h 18m
2 stops
SEA7:48 pmSeattle/Tacoma Intl
$761
Find similar

KLM flights from State of Washington to Belfast

Our best KLM deals on State of Washington to Belfast flight tickets
KLM
Apr 1
SEA5:30 pmSeattle/Tacoma Intl
15h 25m
1 stop
BHD4:55 pmBelfast City
Apr 8
BHD5:30 pmBelfast City
31h 00m
1 stop
SEA4:30 pmSeattle/Tacoma Intl
$660
Find similar
KLM
Apr 1
SEA5:30 pmSeattle/Tacoma Intl
15h 25m
1 stop
BHD4:55 pmBelfast City
Apr 8
BHD9:50 amBelfast City
22h 13m
2 stops
SEA12:03 amSeattle/Tacoma Intl
$670
Find similar
KLM
Mar 20
PDX2:25 pmPortland
19h 25m
1 stop
BHD4:50 pmBelfast City
Mar 28
BHD5:20 pmBelfast City
24h 50m
1 stop
PDX11:10 amPortland
$1,502
Find similar

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 December 23, 2025.
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 - BHD

SEABHD

Seattle/Tacoma Intl

Mon 3/23

7:50 pm-6:35 pm

1 stop15h 45m

Belfast City

Fri 3/27

6:45 am-12:30 pm

1 stop12h 45m

$645

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

3:05 pm-9:00 pm

1 stop21h 55m

Belfast City

Tue 3/17

6:30 am-12:35 pm

1 stop13h 05m

$646

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

3:05 pm-9:00 pm

1 stop21h 55m

Belfast City

Tue 3/17

6:30 am-7:05 pm

2 stops19h 35m

$656

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 4/1

5:30 pm-4:55 pm

1 stop15h 25m

Belfast City

Wed 4/8

5:30 pm-4:30 pm

1 stop31h 00m

$660

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 3/23

7:50 pm-4:05 pm

1 stop13h 15m

Belfast City

Fri 3/27

6:45 am-12:30 pm

1 stop12h 45m

$669

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 4/1

5:30 pm-4:55 pm

1 stop15h 25m

Belfast City

Wed 4/8

9:50 am-12:03 am

2 stops22h 13m

$670

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 3/23

6:44 am-10:40 am

2 stops20h 56m

Belfast City

Fri 3/27

6:45 am-12:30 pm

1 stop12h 45m

$676

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 3/23

1:37 pm-4:05 pm

2 stops19h 28m

Belfast City

Fri 3/27

6:45 am-12:30 pm

1 stop12h 45m

$691

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 4/1

7:15 am-11:55 am

2 stops20h 40m

Belfast City

Wed 4/8

6:50 am-9:46 pm

2 stops22h 56m

$711

PortlandBelfast

PDX - BFS

PDXBFS

Portland

Wed 2/4

9:50 am-5:55 pm

3 stops24h 05m

Belfast Intl

Wed 2/11

10:10 am-9:15 am

3 stops31h 05m

$1,045

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
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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 day to depart on your flight to Belfast?

The cheapest day to depart from State of Washington to Belfast is on a Tuesday when prices can be found for as low as $724. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from State of Washington to Belfast for around $1,208.

What is the cheapest time of day to depart on your flight to Belfast?

Our data shows that the cheapest State of Washington to Belfast flights are usually those with departure times at noon. Our users have found flights to Belfast at noon for as low as $794. Try not to purchase tickets in the afternoon because they tend to be around $1,000. Of course, these prices can vary depending on the time of year and what airport you fly to.

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 30m

Direct flights

None
The fastest flight from State of Washington to Belfast takes 12h 30m
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.

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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