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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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Find the cheapest flights from Washington to Belfast

Cheap round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
8:20 pm - 8:35 pm
SEA
-
BHD
16h 15m
1 stop
British Airways Logo
12:45 pm - 6:25 pm
BHD
-
SEA
13h 40m
1 stop
$891British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
8:20 pm - 7:25 pm
SEA
-
BHD
15h 05m
1 stop
British Airways Logo
9:35 am - 6:25 pm
BHD
-
SEA
16h 50m
1 stop
$892British Airways
Mon, Oct 5 - Thu, Oct 22
British Airways Logo
1:30 pm - 12:55 pm
SEA
-
BHD
15h 25m
1 stop
British Airways Logo
4:05 pm - 6:25 pm
BHD
-
SEA
34h 20m
1 stop
$909British Airways
Mon, Oct 19 - Wed, Oct 21
British Airways Logo
7:30 pm - 5:40 pm
PDX
-
BHD
14h 10m
1 stop
British Airways Logo
8:35 pm - 5:40 pm
BHD
-
PDX
29h 05m
1 stop
$909British Airways
Sun, Aug 23 - Wed, Aug 26
British Airways Logo
8:20 pm - 6:55 pm
SEA
-
BHD
14h 35m
1 stop
British Airways Logo
11:00 am - 6:25 pm
BHD
-
SEA
15h 25m
1 stop
$910British Airways
Tue, Sep 8 - Fri, Sep 25
British Airways Logo
7:30 pm - 6:45 pm
PDX
-
BHD
15h 15m
1 stop
British Airways Logo
6:20 pm - 5:40 pm
BHD
-
PDX
31h 20m
1 stop
$910British Airways
Sun, Aug 23 - Wed, Aug 26
Multiple Airlines Logo
3:10 pm - 3:30 pm
SEA
-
BHD
16h 20m
2 stops
Multiple Airlines Logo
6:30 am - 11:35 am
BHD
-
SEA
13h 05m
1 stop
$914Multiple Airlines
Mon, Oct 5 - Thu, Oct 22
Delta Logo
1:05 pm - 9:20 am
PDX
-
BHD
12h 15m
1 stop
Delta Logo
5:30 pm - 11:10 am
BHD
-
PDX
25h 40m
1 stop
$1,088Delta
Tue, Jul 14 - Wed, Jul 22
Delta Logo
3:00 pm - 4:55 pm
PDX
-
BHD
17h 55m
2 stops
Delta Logo
5:30 pm - 11:10 am
BHD
-
PDX
25h 40m
1 stop
$1,092Delta
Tue, Jul 14 - Wed, Jul 22
Delta Logo
1:05 pm - 4:55 pm
PDX
-
BHD
19h 50m
1 stop
Delta Logo
9:50 am - 11:36 am
BHD
-
PDX
33h 46m
2 stops
$1,105Delta
Mon, Jul 13 - Thu, Jul 23

British Airways flights from State of Washington to Belfast

Our best British Airways deals on State of Washington to Belfast flight tickets
British Airways
Oct 5
SEA8:20 pmSeattle/Tacoma Intl
16h 15m
1 stop
BHD8:35 pmBelfast City
Oct 22
BHD12:45 pmBelfast City
13h 40m
1 stop
SEA6:25 pmSeattle/Tacoma Intl
$891
British Airways
Oct 5
SEA8:20 pmSeattle/Tacoma Intl
15h 05m
1 stop
BHD7:25 pmBelfast City
Oct 22
BHD9:35 amBelfast City
16h 50m
1 stop
SEA6:25 pmSeattle/Tacoma Intl
$892
British Airways
Oct 19
SEA1:30 pmSeattle/Tacoma Intl
15h 25m
1 stop
BHD12:55 pmBelfast City
Oct 21
BHD4:05 pmBelfast City
34h 20m
1 stop
SEA6:25 pmSeattle/Tacoma Intl
$909

Delta flights from State of Washington to Belfast

Our best Delta deals on State of Washington to Belfast flight tickets
Delta
Sep 8
SEA9:50 amSeattle/Tacoma Intl
23h 05m
2 stops
BHD4:55 pmBelfast City
Sep 15
BHD9:50 amBelfast City
18h 39m
2 stops
SEA8:29 pmSeattle/Tacoma Intl
$944
Delta
Oct 8
SEA9:50 amSeattle/Tacoma Intl
23h 05m
2 stops
BHD4:55 pmBelfast City
Oct 22
BHD9:50 amBelfast City
20h 14m
2 stops
SEA10:04 pmSeattle/Tacoma Intl
$994
Delta
Jul 14
PDX1:05 pmPortland
12h 15m
1 stop
BHD9:20 amBelfast City
Jul 22
BHD5:30 pmBelfast City
25h 40m
1 stop
PDX11:10 amPortland
$1,088

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 May 11, 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

Cheapest round-trip

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

8:20 pm-8:35 pm

1 stop16h 15m

Belfast City

Thu 10/22

12:45 pm-6:25 pm

1 stop13h 40m

$891

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

8:20 pm-7:25 pm

1 stop15h 05m

Belfast City

Thu 10/22

9:35 am-6:25 pm

1 stop16h 50m

$892

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/19

1:30 pm-12:55 pm

1 stop15h 25m

Belfast City

Wed 10/21

4:05 pm-6:25 pm

1 stop34h 20m

$909

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 8/23

7:30 pm-5:40 pm

1 stop14h 10m

Belfast City

Wed 8/26

8:35 pm-5:40 pm

1 stop29h 05m

$909

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Tue 9/8

8:20 pm-6:55 pm

1 stop14h 35m

Belfast City

Fri 9/25

11:00 am-6:25 pm

1 stop15h 25m

$910

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Sun 8/23

7:30 pm-6:45 pm

1 stop15h 15m

Belfast City

Wed 8/26

6:20 pm-5:40 pm

1 stop31h 20m

$910
Quickest round-trip

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Mon 10/5

3:10 pm-3:30 pm

2 stops16h 20m

Belfast City

Thu 10/22

6:30 am-11:35 am

1 stop13h 05m

$914

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Tue 7/14

1:05 pm-9:20 am

1 stop12h 15m

Belfast City

Wed 7/22

5:30 pm-11:10 am

1 stop25h 40m

$1,088

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Tue 7/14

3:00 pm-4:55 pm

2 stops17h 55m

Belfast City

Wed 7/22

5:30 pm-11:10 am

1 stop25h 40m

$1,092

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Mon 7/13

1:05 pm-4:55 pm

1 stop19h 50m

Belfast City

Thu 7/23

9:50 am-11:36 am

2 stops33h 46m

$1,105

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 month to fly to Belfast?

In general, July is the cheapest month to fly from State of Washington to Belfast. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you don’t want to visit Belfast in July, then you should wait until January to fly from State of Washington, when ticket prices are also cheap, with an average price of $0.

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

13h 15m

Direct flights

None
The fastest flight from State of Washington to Belfast takes 13h 15m
There are no direct flights from State of Washington to Belfast. There are no popular flight routes from State of Washington to Belfast.
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Frequently asked questions about flying from Washington to Belfast

  • 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.

Best airlines flying from State of Washington to Belfast

Compare and see reviews for airlines that fly from State of Washington to Belfast with momondo
Airline
Rating
Free Cancellation
Price
British AirwaysPriceFrom $776Free CancellationRating
6.7
7,969 reviews
Search British Airways flights

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