What is the cheapest airline that flies from Washington to Belfast?

British Airways is the most popular carrier operating 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?

The number of operators available for flights from Washington to Belfast is 1 as of November 2025.

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.

$346 Cheap Flights from Washington to Belfast in 2025/26

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Cheap round-trip flights

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3:45 pm - 3:15 pmSEA-BFS

15h 30m2 stops

8:10 am - 5:50 pmBFS-SEA

17h 40m2 stops

$626Multiple Airlines

Find Deal

Wed, Apr 15 - Thu, Apr 30

5:45 pm - 2:15 pmPDX-BHD

12h 30m1 stop

11:05 am - 11:32 pmBHD-PDX

20h 27m2 stops

$630Multiple Airlines

Find Deal

Mon, Jan 19 - Thu, Jan 29

3:05 pm - 4:50 pmSEA-BHD

17h 45m1 stop

5:20 pm - 11:50 amBHD-SEA

26h 30m1 stop

$632Virgin Atlantic

Find Deal

Wed, Dec 3 - Sun, Dec 7

10:05 am - 4:50 pmPDX-BHD

22h 45m2 stops

6:30 am - 11:25 amBHD-PDX

12h 55m1 stop

$637KLM

Find Deal

Thu, Dec 4 - Mon, Dec 15

3:05 pm - 4:50 pmSEA-BHD

17h 45m1 stop

5:20 pm - 8:13 pmBHD-SEA

34h 53m2 stops

$642Virgin Atlantic

Find Deal

Wed, Dec 3 - Sun, Dec 7

6:45 pm - 4:35 pmPDX-BHD

14h 50m1 stop

9:15 am - 4:55 pmBHD-PDX

14h 40m1 stop

$658British Airways

Find Deal

Wed, Mar 11 - Wed, Mar 18

2:05 pm - 6:40 pmPDX-BHD

20h 35m2 stops

8:00 pm - 3:55 pmBHD-PDX

27h 55m1 stop

$665British Airways

Find Deal

Tue, Feb 24 - Thu, Mar 5

3:05 pm - 9:00 pmSEA-BHD

21h 55m1 stop

5:20 pm - 11:50 amBHD-SEA

26h 30m1 stop

$685KLM

Find Deal

Wed, Dec 3 - Sun, Dec 7

9:59 pm - 4:50 pmSEA-BHD

34h 51m2 stops

5:20 pm - 8:13 pmBHD-SEA

34h 53m2 stops

$747Delta

Find Deal

Wed, Dec 3 - Sun, Dec 7

11:15 am - 9:00 pmSEA-BHD

25h 45m2 stops

6:30 am - 12:35 pmBHD-SEA

13h 05m1 stop

$796Delta

Find Deal

Sat, Mar 7 - Wed, Mar 18

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 11

PDX6:45 pmPortland

14h 50m

1 stop

BHD4:35 pmBelfast City

Mar 18

BHD9:15 amBelfast City

14h 40m

1 stop

PDX4:55 pmPortland

$658

Find similar

British Airways

Feb 24

PDX2:05 pmPortland

20h 35m

2 stops

BHD6:40 pmBelfast City

Mar 5

BHD8:00 pmBelfast City

27h 55m

1 stop

PDX3:55 pmPortland

$665

Find similar

British Airways

Mar 11

PDX6:00 amPortland

27h 35m

2 stops

BHD4:35 pmBelfast City

Mar 18

BHD9:15 amBelfast City

14h 40m

1 stop

PDX4:55 pmPortland

$687

Find similar

KLM flights from State of Washington to Belfast

Our best KLM deals on State of Washington to Belfast flight tickets

KLM

Dec 4

PDX10:05 amPortland

22h 45m

2 stops

BHD4:50 pmBelfast City

Dec 15

BHD6:30 amBelfast City

12h 55m

1 stop

PDX11:25 amPortland

$637

Find similar

KLM

Dec 3

SEA3:05 pmSeattle/Tacoma Intl

21h 55m

1 stop

BHD9:00 pmBelfast City

Dec 7

BHD5:20 pmBelfast City

26h 30m

1 stop

SEA11:50 amSeattle/Tacoma Intl

$685

Find similar

KLM

Dec 3

SEA3:05 pmSeattle/Tacoma Intl

21h 55m

1 stop

BHD9:00 pmBelfast City

Dec 7

BHD5:20 pmBelfast City

37h 03m

2 stops

SEA10:23 pmSeattle/Tacoma Intl

$695

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

Wed 4/15

3:45 pm-3:15 pm

2 stops15h 30m

Belfast Intl

Thu 4/30

8:10 am-5:50 pm

2 stops17h 40m

$626

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Mon 1/19

5:45 pm-2:15 pm

1 stop12h 30m

Belfast City

Thu 1/29

11:05 am-11:32 pm

2 stops20h 27m

$630

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

3:05 pm-4:50 pm

1 stop17h 45m

Belfast City

Sun 12/7

5:20 pm-11:50 am

1 stop26h 30m

$632

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Thu 12/4

10:05 am-4:50 pm

2 stops22h 45m

Belfast City

Mon 12/15

6:30 am-11:25 am

1 stop12h 55m

$637

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

3:05 pm-4:50 pm

1 stop17h 45m

Belfast City

Sun 12/7

5:20 pm-8:13 pm

2 stops34h 53m

$642

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Wed 3/11

6:45 pm-4:35 pm

1 stop14h 50m

Belfast City

Wed 3/18

9:15 am-4:55 pm

1 stop14h 40m

$658

PortlandBelfast

PDX - BHD

PDXBHD

Portland

Tue 2/24

2:05 pm-6:40 pm

2 stops20h 35m

Belfast City

Thu 3/5

8:00 pm-3:55 pm

1 stop27h 55m

$665

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

3:05 pm-9:00 pm

1 stop21h 55m

Belfast City

Sun 12/7

5:20 pm-11:50 am

1 stop26h 30m

$685

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Wed 12/3

9:59 pm-4:50 pm

2 stops34h 51m

Belfast City

Sun 12/7

5:20 pm-8:13 pm

2 stops34h 53m

$747

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

Sat 3/7

11:15 am-9:00 pm

2 stops25h 45m

Belfast City

Wed 3/18

6:30 am-12:35 pm

1 stop13h 05m

$796

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first

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

Prices

Airlines

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

Direct flights	None

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?
The number of operators available for flights from Washington to Belfast is 1 as of November 2025.
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 Airways	PriceFrom $737	Free Cancellation	Rating 6.7 7,496 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.

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.

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Find better results for your trip to the United Kingdom

Cheap flights from Washington to Belfast from $346

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 3/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Washington to Belfast

Cheap round-trip flights

Cheap one-way flights

British Airways flights from State of Washington to Belfast

Our best British Airways deals on State of Washington to Belfast flight tickets

KLM flights from State of Washington to Belfast

Our best KLM deals on State of Washington to Belfast flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Washington to Belfast that are best for you.

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?

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

Direct flights

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

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?

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

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

Why use momondo?

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

Can I find flights from Washington to Belfast with flexible booking policies on momondo?

How can momondo help me find flights from Washington to Belfast?

I’m not ready to book a flight from Washington to Belfast right now. Can momondo alert me if prices 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

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