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$503+ Cheap flights from Belfast Intl (BFS) to Seattle (SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — SEA
Jan 26 — Feb 21
Sun 1/26
Sun 2/2
1 adult, Economy
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Cheap flight deals from Belfast Intl to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Belfast Intl (BFS) 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 January 21, 2025.

Round-trip from

$503
(Trip.com)

Popular in

July

Cheapest in

February

Average price

$957
From Belfast Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($170 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in January 2025
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Find flight deals from Belfast Intl to Seattle

Cheapest flights from Belfast Intl to Seattle
Explore the most affordable flight options available from Belfast Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2025.

This Trip.com deal was found by Cheapflights users on 1/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/36:30 amBFS - SEA
2 stops18h 30mMultiple Airlines
Mon 3/103:35 pmSEA - BFS
2 stops21h 35mMultiple Airlines
Deal found 1/21$503

Find flights from Belfast Intl to Seattle within your budget

Customize your flight search to find flights from Belfast Intl 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 January 21, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

BelfastSeattle

BFS - SEA

BFSSEA

Belfast Intl

Mon 3/3

6:30 am-5:00 pm

2 stops18h 30m

Seattle/Tacoma Intl

Mon 3/10

3:35 pm-8:10 pm

2 stops21h 35m

$503

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Best time to book a flight from Belfast Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Belfast Intl 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 Intl to Seattle

Get recent, data-driven insights about flights from Belfast Intl 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).

Related info for your journey

Find useful and relevant information for your journey from Belfast Intl 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 Intl?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Belfast Intl to Seattle. 0 airlines have flights to Seattle/Tacoma Intl from Belfast Intl on a regular basis. Booking flights from Belfast Intl to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 0 inbound flights from Belfast Intl per day.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Belfast Intl Airport to Seattle (average of $238). Flying from Belfast Intl Airport 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 Intl Airport?

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

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Alternative routes for Belfast Intl to Seattle

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