What are the cheapest airlines to fly from State of Washington to Belfast one-way?

One-way options have recently been found by users for as low as £318 on British Airways. Other airlines that offer cheap prices include KLM from £384 and Delta from £388 one-way.

What is the cheapest month to book a flight from State of Washington to Belfast?

Currently, January is the cheapest month in which you can book a flight from State of Washington to Belfast (average of £67). Flying from State of Washington to Belfast in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

In terms of precipitation, rainfall in Belfast ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast when rainfall is around 50.0 mm.

If weather is an important factor for your trip to Belfast, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

What are the most popular routes from State of Washington to Belfast?

When deciding which route to take from State of Washington to Belfast consider Seattle/Tacoma Intl - Belfast Intl, Seattle/Tacoma Intl - Belfast City or Portland - Belfast Intl as they are the most popular.

What is the cheapest month to fly from State of Washington to Belfast?

Flights from State of Washington to Belfast lean towards being more expensive in July. Prices are generally better when you fly from State of Washington to Belfast in March, with the cheapest ticket starting at £534.

What is the cheapest time of day to fly from WA to BFS?

When flying from State of Washington to Belfast, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Can I find deals for flights from Washington to Belfast that include hotel bookings?

Yes. In addition to deals on Washington to Belfast flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Washington to Belfast?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Belfast.

Can I find deals for business class flights from Washington to Belfast?

Yes. Cheapflights offers flight deals from Washington to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£294+ Flights from Washington to Belfast

Cheap flight deals from Washington to Belfast

Round-trip from	£426
One-way from	£294
Popular in	July
Cheapest in	March
Average price	£689

14/9-29/9
4 total stops
41h 20m total
Washington to Belfast

Search Deals

16/8
3 total stops
51h 52m total
Washington to Belfast

Search Deals

Highest demand for flights based on searches. 12% potential increase in price (£70 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (£14 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2025

Search Deals

Find flight deals from Washington to Belfast

Cheapest flights from Washington to Belfast
Explore the most affordable flight options available from Washington to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 agosto 2025.

dom 14/919:00SEA - BFS

2 stops19h 25mMultiple Airlines

lun 29/906:45BFS - SEA

2 stops21h 55mMultiple Airlines

Deal found 31/7£426

dom 14/919:00SEA - BHD

2 stops17h 25mMultiple Airlines

lun 29/907:05BHD - SEA

2 stops21h 35mMultiple Airlines

Deal found 31/7£496

sab 23/823:59PDX - BHD

2 stops25h 21mBritish Airways

dom 31/806:50BHD - PDX

2 stops23h 14mBritish Airways

Deal found 30/7£558

mer 10/915:00SEA - BHD

2 stops16h 35mBritish Airways

lun 15/919:30BHD - SEA

1 stop23h 40mBritish Airways

Deal found 30/7£561

dom 14/917:40SEA - BHD

1 stop15h 15mKLM

lun 29/917:25BHD - SEA

2 stops30h 41mKLM

Deal found 31/7£626

dom 14/909:40SEA - BHD

2 stops23h 15mDelta

lun 29/906:30BHD - SEA

2 stops17h 36mDelta

Deal found 31/7£673

mar 2/1201:23SEA - BHD

2 stops28h 52mAmerican Airlines

dom 7/1206:30BHD - SEA

2 stops19h 50mAmerican Airlines

Deal found 30/7£744

mar 23/1206:00SEA - BHD

2 stops26h 50mVirgin Atlantic

dom 11/117:20BHD - SEA

2 stops31h 40mVirgin Atlantic

Deal found 30/7£1,189

Best flights from Washington to Belfast
Discover carefully curated flight deals from Washington to Belfast that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 1 agosto 2025.

dom 14/919:00SEA - BFS

2 stops19h 25mMultiple Airlines

lun 29/906:45BFS - SEA

2 stops21h 55mMultiple Airlines

Deal found 31/7£426

sab 23/823:59PDX - BHD

2 stops25h 21mBritish Airways

dom 31/806:50BHD - PDX

2 stops23h 14mBritish Airways

Deal found 30/7£558

dom 14/917:40SEA - BHD

1 stop15h 15mKLM

lun 29/917:25BHD - SEA

2 stops30h 41mKLM

Deal found 31/7£626

dom 14/909:40SEA - BHD

2 stops23h 15mDelta

lun 29/906:30BHD - SEA

2 stops17h 36mDelta

Deal found 31/7£673

mar 2/1201:23SEA - BHD

2 stops28h 52mAmerican Airlines

dom 7/1206:30BHD - SEA

2 stops19h 50mAmerican Airlines

Deal found 30/7£744

dom 14/919:00SEA - BHD

2 stops17h 25mMultiple Airlines

lun 29/907:05BHD - SEA

2 stops21h 35mMultiple Airlines

Deal found 31/7£496

mer 10/915:00SEA - BHD

2 stops16h 35mBritish Airways

lun 15/919:30BHD - SEA

1 stop23h 40mBritish Airways

Deal found 30/7£561

mar 23/1206:00SEA - BHD

2 stops26h 50mVirgin Atlantic

dom 11/117:20BHD - SEA

2 stops31h 40mVirgin Atlantic

Deal found 30/7£1,189

Last-minute flights from Washington to Belfast
Discover last-minute flight deals from Washington to Belfast. Data last updated 1 agosto 2025 and is based on user searches.

sab 23/823:59PDX - BHD

2 stops25h 21mBritish Airways

dom 31/806:50BHD - PDX

2 stops23h 14mBritish Airways

Deal found 30/7£558

sab 23/800:46SEA - BHD

2 stops28h 19mMultiple Airlines

gio 4/906:35BHD - SEA

2 stops20h 34mMultiple Airlines

Deal found 29/7£856

dom 24/807:44SEA - BHD

2 stops17h 36mBritish Airways

gio 4/919:25BHD - SEA

2 stops30h 04mBritish Airways

Deal found 29/7£648

dom 24/817:40SEA - BHD

1 stop19h 35mKLM

gio 4/906:40BHD - SEA

1 stop17h 25mKLM

Deal found 29/7£721

dom 24/816:00SEA - BFS

2 stops23h 20mMultiple Airlines

gio 4/921:10BFS - SEA

3 stops47h 49mMultiple Airlines

Deal found 29/7£750

One-way flights from Washington to Belfast
Search for one-way flight options from Washington to Belfast. Find affordable one-way fares based on user searches. Data last updated 1 agosto 2025.

sab 16/819:48SEA - BFS

3 stops51h 52mMultiple Airlines

Deal found 30/7£294

gio 18/913:08PDX - BHD

2 stops47h 17mMultiple Airlines

Deal found 30/7£311

gio 18/916:46PDX - BFS

3 stops56h 39mMultiple Airlines

Deal found 30/7£317

sab 23/823:59PDX - BHD

2 stops25h 21mBritish Airways

Deal found 31/7£318

gio 21/819:35SEA - BHD

3 stops54h 15mMultiple Airlines

Deal found 30/7£332

mar 19/813:30SEA - BHD

1 stop13h 05mBritish Airways

Deal found 30/7£361

mer 20/817:40SEA - BHD

1 stop19h 35mKLM

Deal found 30/7£384

mer 20/809:25SEA - BHD

2 stops27h 50mDelta

Deal found 30/7£388

ven 22/810:40SEA - BHD

2 stops23h 35mAmerican Airlines

Deal found 30/7£464

Fly from

Fly to

Route

Depart

Return

Price

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

dom 14/9

19:00-22:25

2 stops19h 25m

Belfast Intl

lun 29/9

06:45-20:40

2 stops21h 55m

£426

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

dom 14/9

19:00-20:25

2 stops17h 25m

Belfast City

lun 29/9

07:05-20:40

2 stops21h 35m

£496

PortlandBelfast

PDX - BHD

PDXBHD

Portland

sab 23/8

23:59-09:20

2 stops25h 21m

Belfast City

dom 31/8

06:50-22:04

2 stops23h 14m

£558

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

mer 10/9

15:00-15:35

2 stops16h 35m

Belfast City

lun 15/9

19:30-11:10

1 stop23h 40m

£561

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

dom 14/9

17:40-16:55

1 stop15h 15m

Belfast City

lun 29/9

17:25-16:06

2 stops30h 41m

£626

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

dom 14/9

09:40-16:55

2 stops23h 15m

Belfast City

lun 29/9

06:30-16:06

2 stops17h 36m

£673

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

mar 2/12

01:23-14:15

2 stops28h 52m

Belfast City

dom 7/12

06:30-18:20

2 stops19h 50m

£744

SeattleBelfast

SEA - BHD

SEABHD

Seattle/Tacoma Intl

mar 23/12

06:00-16:50

2 stops26h 50m

Belfast City

dom 11/1

17:20-17:00

2 stops31h 40m

£1,189

SeattleBelfast

SEA - BFS

SEABFS

Seattle/Tacoma Intl

sab 16/8

19:48-07:40

3 stops51h 52m

£294

PortlandBelfast

PDX - BHD

PDXBHD

Portland

gio 18/9

13:08-20:25

2 stops47h 17m

£311

Flights are sorted by cheapest return flights first.

Deals found on 30/7

Showing 1-10 of 17 results

Best time to book a flight from Washington to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Washington with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington to Belfast

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Belfast

Check out reviews from past customers who have flown with Delta, KLM, andVirgin Atlantic from Washington to Belfast to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,981 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,981 reviews

Delta

8.0

Very Good

7,981 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,383 reviews

Delta

8.0

Very Good

7,981 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Virgin Atlantic

7.4

Good

655 reviews

Delta

8.0

Very Good

7,981 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very Good

7,981 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

British Airways

6.6

Okay

7,222 reviews

Delta

8.0

Very Good

7,981 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What are the cheapest airlines to fly from State of Washington to Belfast one-way?
One-way options have recently been found by users for as low as £318 on British Airways. Other airlines that offer cheap prices include KLM from £384 and Delta from £388 one-way.
What are the most popular routes from State of Washington to Belfast?
When deciding which route to take from State of Washington to Belfast consider Seattle/Tacoma Intl - Belfast Intl, Seattle/Tacoma Intl - Belfast City or Portland - Belfast Intl as they are the most popular.
Can I find deals for flights from Washington to Belfast that include hotel bookings?
Yes. In addition to deals on Washington to Belfast flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Washington to Belfast?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Belfast.
Can I find deals for business class flights from Washington to Belfast?
Yes. Cheapflights offers flight deals from Washington to Belfast by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from State of Washington to Belfast?
Currently, January is the cheapest month in which you can book a flight from State of Washington to Belfast (average of £67). Flying from State of Washington to Belfast in July is currently the most expensive (average of £90). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Washington to Belfast

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Raleigh to Belfast City flights

Fly with Cheapflights

How does Cheapflights help users find flights from Washington to Belfast?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Washington to Belfast. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Washington to Belfast?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Belfast from Washington.

Can Cheapflights find flights from Washington to Belfast with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Washington to Belfast, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Washington to Belfast become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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Cheap flights from Washington to Belfast from £294

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/8. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Washington to Belfast

Keep the following information in mind while searching for Washington to Belfast flight deals. Data was last updated 1 agosto 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Washington to Belfast

Cheapest flights from Washington to BelfastExplore the most affordable flight options available from Washington to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 agosto 2025.

Explore the most affordable flight options available from Washington to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 agosto 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Washington to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast from Washington with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington to Belfast

Reviews of airlines servicing Belfast

Check out reviews from past customers who have flown with Delta, KLM, andVirgin Atlantic from Washington to Belfast to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Washington to Belfast. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines to fly from State of Washington to Belfast one-way?

What are the most popular routes from State of Washington to Belfast?

Can I find deals for flights from Washington to Belfast that include hotel bookings?

How can I find direct flights from Washington to Belfast?

Can I find deals for business class flights from Washington to Belfast?

What is the cheapest month to book a flight from State of Washington to Belfast?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Washington to Belfast

See prices for flight routes from nearby airports that may be better suited for you.

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Washington to Belfast?

Why should you use Cheapflights to find cheap flight tickets from Washington to Belfast?

Can Cheapflights find flights from Washington to Belfast with no change fees?

Can Cheapflights notify me if prices for flights from Washington to Belfast become cheaper?

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Washington to Belfast
Explore the most affordable flight options available from Washington to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 agosto 2025.