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

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

How old do you have to be to fly from Northern Ireland to Washington?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Northern Ireland to Washington.

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

The required travel and health documents for your Washington trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$439 Cheap Flights from Northern Ireland to Washington in 2026

Find the cheapest flights from Northern Ireland to Washington

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:35 am - 11:35 amBHD Belfast City-SEA Seattle/Tacoma Intl

32h 00m1 stop London Heathrow

1:30 pm - 10:10 amSEA Seattle/Tacoma Intl-BHD Belfast City

12h 40m1 stop London Heathrow

$868Iberia

Mon, Oct 5 - Thu, Oct 22

11:35 am - 12:36 amBHD Belfast City-SEA Seattle/Tacoma Intl

21h 01m2 stops London Heathrow Chicago O'Hare Intl

3:14 pm - 3:30 pmSEA Seattle/Tacoma Intl-BHD Belfast City

16h 16m2 stops Chicago O'Hare Intl London Heathrow

$873Iberia

Mon, Oct 5 - Thu, Oct 22

9:10 pm - 9:40 amBFS Belfast Intl-SEA Seattle/Tacoma Intl

44h 30m3 stops London Gatwick Toronto Pearson Intl Calgary

3:40 pm - 9:00 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

21h 20m2 stops Reykjavik Keflavik Intl Glasgow Intl

$884Multiple Airlines

Sun, Sep 27 - Sun, Oct 4

9:10 pm - 9:40 amBFS Belfast Intl-SEA Seattle/Tacoma Intl

44h 30m3 stops London Gatwick Toronto Pearson Intl Calgary

3:40 pm - 8:55 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

21h 15m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Edinburgh Turnhouse

$901Multiple Airlines

Sun, Sep 27 - Sun, Oct 4

6:40 am - 10:42 pmBFS Belfast Intl-SEA Seattle/Tacoma Intl

24h 02m3 stops London Stansted Munich Franz Josef Strauss Vancouver Intl

7:00 pm - 11:05 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

20h 05m2 stops Reykjavik Keflavik Intl Glasgow Intl

$948Multiple Airlines

Mon, Oct 5 - Thu, Oct 22

6:40 am - 10:42 pmBFS Belfast Intl-SEA Seattle/Tacoma Intl

24h 02m3 stops London Stansted Munich Franz Josef Strauss Vancouver Intl

7:00 pm - 11:25 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

20h 25m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen London Stansted

$953Multiple Airlines

Mon, Oct 5 - Thu, Oct 22

6:15 am - 9:40 amBFS Belfast Intl-SEA Seattle/Tacoma Intl

35h 25m3 stops London Gatwick Halifax Intl Calgary

7:00 pm - 9:05 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

18h 05m2 stops Reykjavik Keflavik Intl London Gatwick

$959Multiple Airlines

Tue, Sep 29 - Tue, Oct 6

7:10 am - 1:45 pmBFS Belfast Intl-SEA Seattle/Tacoma Intl

14h 35m2 stops Manchester Kastrup Copenhagen

3:55 pm - 9:30 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

21h 35m2 stops Kastrup Copenhagen Manchester

$961Multiple Airlines

Sun, Sep 27 - Sun, Oct 4

8:20 am - 8:40 pmBFS Belfast Intl-SEA Seattle/Tacoma Intl

20h 20m2 stops London Gatwick Reykjavik Keflavik Intl

7:00 pm - 9:05 pmSEA Seattle/Tacoma Intl-BFS Belfast Intl

18h 05m2 stops Reykjavik Keflavik Intl London Gatwick

$962Multiple Airlines

Tue, Sep 29 - Tue, Oct 6

7:40 am - 4:50 pmBHD Belfast City-SEA Seattle/Tacoma Intl

17h 10m1 stop London Heathrow

6:12 am - 2:15 pmSEA Seattle/Tacoma Intl-BHD Belfast City

24h 03m2 stops Chicago O'Hare Intl London Heathrow

$975British Airways

Thu, Nov 5 - Mon, Nov 9

Cheap last minute flights

Enter your travel dates to find the best prices.

9:50 am - 5:10 pmBHD Belfast City-SEA Seattle/Tacoma Intl

15h 20m2 stops Glasgow Intl Dublin

7:10 pm - 8:50 pmSEA Seattle/Tacoma Intl-BHD Belfast City

17h 40m2 stops Dublin Edinburgh Turnhouse

$4,442Aer Lingus

Thu, Aug 20 - Mon, Aug 24

9:50 am - 5:10 pmBHD Belfast City-SEA Seattle/Tacoma Intl

15h 20m2 stops Glasgow Intl Dublin

7:10 pm - 6:00 pmSEA Seattle/Tacoma Intl-BHD Belfast City

14h 50m2 stops Dublin Edinburgh Turnhouse

$4,446Aer Lingus

Thu, Aug 20 - Mon, Aug 24

9:50 am - 5:10 pmBHD Belfast City-SEA Seattle/Tacoma Intl

15h 20m2 stops Glasgow Intl Dublin

7:10 pm - 6:00 pmSEA Seattle/Tacoma Intl-BHD Belfast City

14h 50m2 stops Dublin Edinburgh Turnhouse

$4,447Aer Lingus

Thu, Aug 20 - Mon, Aug 24

9:50 am - 5:10 pmBHD Belfast City-SEA Seattle/Tacoma Intl

15h 20m2 stops Glasgow Intl Dublin

7:10 pm - 9:05 pmSEA Seattle/Tacoma Intl-BHD Belfast City

17h 55m2 stops Dublin Manchester

$4,458Aer Lingus

Wed, Aug 19 - Mon, Aug 24

9:50 am - 5:10 pmBHD Belfast City-SEA Seattle/Tacoma Intl

15h 20m2 stops Glasgow Intl Dublin

7:10 pm - 9:05 pmSEA Seattle/Tacoma Intl-BHD Belfast City

17h 55m2 stops Dublin Manchester

$4,463Aer Lingus

Wed, Aug 19 - Mon, Aug 24

6:20 pm - 5:10 pmBHD Belfast City-SEA Seattle/Tacoma Intl

30h 50m2 stops Manchester Dublin

7:10 pm - 9:05 pmSEA Seattle/Tacoma Intl-BHD Belfast City

17h 55m2 stops Dublin Manchester

$4,480Aer Lingus

Wed, Aug 19 - Mon, Aug 24

9:50 am - 4:27 pmBHD Belfast City-SEA Seattle/Tacoma Intl

14h 37m1 stop Amsterdam Schiphol

6:05 am - 9:20 amSEA Seattle/Tacoma Intl-BHD Belfast City

19h 15m2 stops Minneapolis St Paul Amsterdam Schiphol

$7,949Delta

Wed, Aug 19 - Mon, Aug 24

5:30 pm - 11:37 amBHD Belfast City-SEA Seattle/Tacoma Intl

26h 07m1 stop Amsterdam Schiphol

1:33 pm - 4:55 pmSEA Seattle/Tacoma Intl-BHD Belfast City

19h 22m2 stops Vancouver Intl Amsterdam Schiphol

$7,951KLM

Wed, Aug 19 - Mon, Aug 24

5:30 pm - 11:37 amBHD Belfast City-SEA Seattle/Tacoma Intl

26h 07m1 stop Amsterdam Schiphol

1:33 pm - 4:55 pmSEA Seattle/Tacoma Intl-BHD Belfast City

19h 22m2 stops Vancouver Intl Amsterdam Schiphol

$7,957KLM

Wed, Aug 19 - Mon, Aug 24

9:50 am - 4:27 pmBHD Belfast City-SEA Seattle/Tacoma Intl

14h 37m1 stop Amsterdam Schiphol

1:50 pm - 4:55 pmSEA Seattle/Tacoma Intl-BHD Belfast City

19h 05m1 stop Amsterdam Schiphol

$7,959Delta

Wed, Aug 19 - Mon, Aug 24

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Iberia flights from Northern Ireland to State of Washington

Our best Iberia deals on Northern Ireland to State of Washington flight tickets

Iberia

Oct 5

BHD11:35 amBelfast City

32h 00m

1 stop

SEA11:35 amSeattle/Tacoma Intl

Oct 22

SEA1:30 pmSeattle/Tacoma Intl

12h 40m

1 stop

BHD10:10 amBelfast City

$868

Iberia

Oct 5

BHD11:35 amBelfast City

21h 01m

2 stops

SEA12:36 amSeattle/Tacoma Intl

Oct 22

SEA3:14 pmSeattle/Tacoma Intl

16h 16m

2 stops

BHD3:30 pmBelfast City

$873

British Airways flights from Northern Ireland to State of Washington

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

British Airways

Nov 5

BHD7:40 amBelfast City

17h 10m

1 stop

SEA4:50 pmSeattle/Tacoma Intl

Nov 9

SEA6:12 amSeattle/Tacoma Intl

24h 03m

2 stops

BHD2:15 pmBelfast City

$975

British Airways

Oct 7

BHD11:35 amBelfast City

32h 00m

1 stop

SEA11:35 amSeattle/Tacoma Intl

Oct 11

SEA8:20 pmSeattle/Tacoma Intl

16h 15m

1 stop

BHD8:35 pmBelfast City

$976

British Airways

Nov 5

BHD6:30 amBelfast City

12h 55m

1 stop

SEA11:25 amSeattle/Tacoma Intl

Nov 9

SEA10:41 amSeattle/Tacoma Intl

21h 24m

2 stops

BHD4:05 pmBelfast City

$977

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 10/5

11:35 am-11:35 am

1 stop32h 00m

Seattle/Tacoma Intl

Thu 10/22

1:30 pm-10:10 am

1 stop12h 40m

$868

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Mon 10/5

11:35 am-12:36 am

2 stops21h 01m

Seattle/Tacoma Intl

Thu 10/22

3:14 pm-3:30 pm

2 stops16h 16m

$873

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 9/27

9:10 pm-9:40 am

3 stops44h 30m

Seattle/Tacoma Intl

Sun 10/4

3:40 pm-9:00 pm

2 stops21h 20m

$884

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 9/27

9:10 pm-9:40 am

3 stops44h 30m

Seattle/Tacoma Intl

Sun 10/4

3:40 pm-8:55 pm

3 stops21h 15m

$901

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Mon 10/5

6:40 am-10:42 pm

3 stops24h 02m

Seattle/Tacoma Intl

Thu 10/22

7:00 pm-11:05 pm

2 stops20h 05m

$948

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Mon 10/5

6:40 am-10:42 pm

3 stops24h 02m

Seattle/Tacoma Intl

Thu 10/22

7:00 pm-11:25 pm

3 stops20h 25m

$953

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 9/29

6:15 am-9:40 am

3 stops35h 25m

Seattle/Tacoma Intl

Tue 10/6

7:00 pm-9:05 pm

2 stops18h 05m

$959

Quickest round-trip

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Sun 9/27

7:10 am-1:45 pm

2 stops14h 35m

Seattle/Tacoma Intl

Sun 10/4

3:55 pm-9:30 pm

2 stops21h 35m

$961

BelfastSeattle

BFS Belfast Intl - SEA Seattle/Tacoma Intl

BFSSEA

Belfast Intl

Tue 9/29

8:20 am-8:40 pm

2 stops20h 20m

Seattle/Tacoma Intl

Tue 10/6

7:00 pm-9:05 pm

2 stops18h 05m

$962

BelfastSeattle

BHD Belfast City - SEA Seattle/Tacoma Intl

BHDSEA

Belfast City

Thu 11/5

7:40 am-4:50 pm

1 stop17h 10m

Seattle/Tacoma Intl

Mon 11/9

6:12 am-2:15 pm

2 stops24h 03m

$975

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Northern Ireland to State of Washington

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 Northern Ireland to Washington?

British Airways is the most popular carrier operating from Northern Ireland to Washington

Cheap Northern Ireland to State of Washington flight deals and tips

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

Fastest flight time	12h 55m
Direct flights	None

The fastest flight from Northern Ireland to State of Washington takes 12h 55m

There are no direct flights from Northern Ireland to State of Washington. There are no popular flight routes from Northern Ireland to State of Washington.

Search flight deals

Frequently asked questions about flying from Northern Ireland to Washington

When did momondo last update prices for flights from Northern Ireland to Washington?
Prices for flights from Northern Ireland to Washington are refreshed on a daily basis.
How old do you have to be to fly from Northern Ireland to Washington?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Northern Ireland to Washington.
What documentation or ID do you need to fly to Washington?
The required travel and health documents for your Washington trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

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

It is quick and easy to find Northern Ireland to Washington flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Washington that suits you.

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

Yes. momondo allows you to filter the results for Northern Ireland to Washington flights to just show those with flexible booking policies.

How can momondo help me find flights from Northern Ireland to Washington?

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 Washington from Northern Ireland.

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

Of course. momondo tracks the price of Northern Ireland to Washington flights. All you need is a valid email address and we will do the rest; it is that quick and easy.