HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seattle

$333+ Cheap flights from Belfast to Seattle (SEA)

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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Belfast to Seattle with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Belfast to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Belfast (BF1) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 20, 2025.

Round-trip from

$793
(EaseMyTrip)

One-way from

$333
(Kiwi.com)
From Belfast to Seattle/Tacoma Intl
Search Deals
One-way flight from Belfast to Seattle/Tacoma Intl
Search Deals

Find flight deals from Belfast to Seattle

Cheapest flights from Belfast to Seattle
Explore the most affordable flight options available from Belfast to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This Expedia deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:40 amBHD - SEA
1 stop12h 55mMultiple Airlines
Sun 9/213:05 pmSEA - BHD
2 stops18h 40mMultiple Airlines
Deal found 2/20$775
This EaseMyTrip deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure EaseMyTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/85:25 pmBHD - SEA
1 stop26h 15mVirgin Atlantic
Thu 5/222:10 pmSEA - BHD
1 stop23h 05mVirgin Atlantic
Deal found 2/20$793
This EaseMyTrip deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure EaseMyTrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/84:20 pmBHD - SEA
1 stop34h 00mIberia
Thu 5/222:25 pmSEA - BHD
2 stops17h 05mIberia
Deal found 2/20$795
This Delta deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/86:30 amBHD - SEA
1 stop17h 20mDelta
Thu 5/226:10 pmSEA - BHD
1 stop14h 45mDelta
Deal found 2/20$800
This TravelUp deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:30 amBHD - SEA
1 stop13h 15mKLM
Sun 9/211:55 pmSEA - BHD
1 stop23h 20mKLM
Deal found 2/20$807
This Mytrip deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/62:55 pmBFS - SEA
2 stops41h 04mMultiple Airlines
Sun 4/133:45 pmSEA - BFS
2 stops22h 35mMultiple Airlines
Deal found 2/20$900
This ChecknFly deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure ChecknFly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/87:25 pmBHD - SEA
2 stops29h 34mAer Lingus
Thu 5/226:45 pmSEA - BHD
2 stops30h 30mAer Lingus
Deal found 2/20$948
This Gotogate deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/157:30 pmBHD - SEA
1 stop30h 50mBritish Airways
Sun 9/218:20 pmSEA - BHD
1 stop13h 25mBritish Airways
Deal found 2/20$1,758

Find flights from Belfast to Seattle within your budget

Customize your flight search to find flights from Belfast to Seattle 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, Cheapflights users made 2,558,603 searches. Data last updated February 20, 2025.

Fly from

Belfast

Fly to

Seattle

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/8

5:25 pm-11:40 am

1 stop26h 15m

Seattle/Tacoma Intl

Thu 5/22

2:10 pm-9:15 pm

1 stop23h 05m

$793

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/8

4:20 pm-6:20 pm

1 stop34h 00m

Seattle/Tacoma Intl

Thu 5/22

2:25 pm-3:30 pm

2 stops17h 05m

$795

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/8

6:30 am-3:50 pm

1 stop17h 20m

Seattle/Tacoma Intl

Thu 5/22

6:10 pm-4:55 pm

1 stop14h 45m

$800

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/8

6:30 am-3:50 pm

1 stop17h 20m

Seattle/Tacoma Intl

Thu 5/29

2:10 pm-4:55 pm

1 stop18h 45m

$835

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Fri 5/9

6:30 am-11:40 am

1 stop13h 10m

Seattle/Tacoma Intl

Fri 5/30

6:10 pm-9:15 pm

1 stop19h 05m

$873

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Sun 4/6

2:55 pm-11:59 pm

2 stops41h 04m

Seattle/Tacoma Intl

Sun 4/13

3:45 pm-10:20 pm

2 stops22h 35m

$900

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Thu 5/8

7:25 pm-4:59 pm

2 stops29h 34m

Seattle/Tacoma Intl

Thu 5/22

6:45 pm-9:15 am

2 stops30h 30m

$948

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Tue 3/4

4:20 pm-9:59 pm

3 stops37h 39m

$333

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 3/17

9:05 pm-8:43 am

2 stops42h 38m

$398

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Mon 3/17

7:30 pm-12:20 pm

1 stop23h 50m

$1,051

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 12 results
1
2

Best time to book a flight from Belfast to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Belfast with our price prediction graph.
Estimated round-trip 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.

Travel insights for flights from Belfast to Seattle

Get recent, data-driven insights about flights from Belfast to Seattle including ideal travel times, pricing trends, and more.

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated February 20, 2025.
Delta
8.0
Very good
8,220 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta
8.0
Very good
8,220 reviews
Delta
8.0
Very good
8,220 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
8,220 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Virgin Atlantic
7.5
Good
654 reviews
Delta
8.0
Very good
8,220 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Aer Lingus
7.0
Good
1,070 reviews
Delta
8.0
Very good
8,220 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Iberia
7.0
Good
2,639 reviews
Delta
8.0
Very good
8,220 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

8.0

Reviews

1 / 20

10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

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

  • What airport do you fly into for flights to Seattle from Belfast?

    Seattle/Tacoma Intl (SEA) is the airport you will fly into if you book a flight from Belfast to Seattle. You should not have trouble finding flights to Seattle/Tacoma Intl from Belfast; the airport handles an average of 0 inbound flights from Belfast per day. You should also have plenty of airline options to choose from since 0 airlines have flights to the Seattle airport from Belfast. It is only a 11.4 mi journey from Seattle/Tacoma Intl (SEA) to Seattle’s city center.

  • What are the cheapest airlines flying from Belfast to Seattle round-trip?

    Flying on Virgin Atlantic is currently your cheapest option to Seattle, with prices starting at $793. Additional round-trip tickets that might be worth considering are offered by Iberia and Delta, with the lowest prices starting at $795 and $800, respectively.

  • What are the cheapest airlines to fly from Belfast to Seattle one-way?

    The cheapest airline one-way is Aer Lingus, with whom users have recently found tickets for as low as $1,051. However, be on the lookout for offers from Iberia and Delta, as they are both options that can get you from Belfast to Seattle for a low price.

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

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

  • How can I find direct flights from Belfast to Seattle?

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

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

    Yes. Cheapflights offers flight deals from Belfast to Seattle 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 Belfast to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Belfast to Seattle (average of $238). Flying from Belfast to Seattle in July is currently the most expensive (average of $411). 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

Traveling to a place near Belfast?

Book flights to Belfast if you plan to visit one of these locations
SeaTac
Tukwila
Renton
Tacoma
Lacey
Ocean Shores
Leavenworth
Olympia
Federal Way
Centralia
Marysville
Cle Elum
Mukilteo
Aberdeen
Lakewood
Issaquah
Shoreline
Lynnwood
Shelton
Silverdale

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 Belfast to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Belfast Intl to Seattle flights
Belfast City to Seattle flights
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.