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Cheap flights from Belfast City Airport to Seattle from £553

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
BHD — SEA
5 May — 12 May1
1 adult

Cheap flight deals from Belfast City to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Belfast City (BHD) 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 30 April 2025.

Round-trip from

£668

Popular in

July

Cheapest in

May

Average price

£515
KLM
  • KLM
  • 21/5-30/5
  • 2 total stops
  • 36h 35m total
  • Belfast to Seattle
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£109 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find flight deals from Belfast City to Seattle

Cheapest flights from Belfast City to Seattle
Explore the most affordable flight options available from Belfast City to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 April 2025.

Thu 8/517:25BHD - SEA
1 stop30h 32mKLM
Thu 22/518:07SEA - BHD
1 stop19h 08mKLM
Deal found 30/4£553
Thu 8/512:40BHD - SEA
2 stops18h 29mBritish Airways
Thu 22/513:30SEA - BHD
1 stop13h 40mBritish Airways
Deal found 30/4£561
Thu 8/506:35BHD - SEA
1 stop13h 00mAmerican Airlines
Thu 22/513:30SEA - BHD
1 stop13h 40mAmerican Airlines
Deal found 29/4£609
Thu 8/506:30BHD - SEA
2 stops20h 00mDelta
Thu 29/511:40SEA - BHD
2 stops21h 15mDelta
Deal found 29/4£644
Wed 21/506:30BHD - SEA
2 stops21h 53mMultiple Airlines
Fri 30/513:30SEA - BHD
2 stops23h 45mMultiple Airlines
Deal found 29/4£766

Cheapflights Fare Finder

Customise your flight search to find flights from Belfast City 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 858,174 searches. Data last updated 30 April 2025.
Use the filters below to find and compare flights from Belfast City Airport to Seattle that are best for you.

Fly from

Belfast City

Fly to

Seattle

Route

Depart

Return

Price

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/5

06:30-15:57

1 stop17h 27m

Seattle/Tacoma Intl

Fri 30/5

18:07-21:15

1 stop19h 08m

£668

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Sat 17/5

06:30-16:36

2 stops18h 06m

Seattle/Tacoma Intl

Sat 24/5

18:07-16:55

1 stop14h 48m

£702

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 21/5

06:30-20:23

2 stops21h 53m

Seattle/Tacoma Intl

Fri 30/5

13:30-21:15

2 stops23h 45m

£766

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 30/7

06:50-17:50

2 stops19h 00m

£807

BelfastSeattle

BHD - SEA

BHDSEA

Belfast City

Wed 30/7

20:15-11:35

1 stop23h 20m

£890

Flights are sorted by cheapest return flights first.

Deals found on 29/4

Best time to book a flight from Belfast City to Seattle

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

What is the cheapest time of day to fly from BHD to SEA?

Find hourly flight availability from Belfast City to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 30 April 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast City Airport to Seattle as you normally would.

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 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit Seattle when rainfall is around 18.0 mm.

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 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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 30 April 2025.
See what other customers who have flown with Delta, KLM and Aer Lingus from Belfast to Seattle have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Crew

8.5

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
7,934 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Crew

8.5

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
1,334 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Crew

8.5

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
1,076 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Food

7.3

Comfort

7.9

Crew

8.5

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 City 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 City?

    Most people fly into Seattle/Tacoma Intl (SEA) if they book a flight to Seattle from Belfast City. On average, Seattle/Tacoma Intl has 0 inbound flights from Belfast City per day from 0 airlines. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

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

    Our cheapest airline available from Belfast City Airport to Seattle is KLM. Our recent data shows that you can find tickets from as low as £668 on this airline. An additional option worth looking into is Delta, starting at £702.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Belfast City Airport to Seattle (average of £622). Flying from Belfast City Airport to Seattle in July is currently the most expensive (average of £946). 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

Travelling to a place near Belfast City Airport?

Book flights to Belfast City Airport if you plan to visit one of these locations
Tacoma
Leavenworth
Bothell

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Belfast City to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
Belfast Intl to Seattle flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Belfast City to Seattle?

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Belfast City to Seattle for you. Better yet — we are completely free to use.

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

Yes! Cheapflights helps users easily find flights from Belfast City to Seattle with no change fees.

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

Yes! Start tracking prices for Belfast City to Seattle flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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