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$427+ Cheap flights from Glasgow Intl (GLA) 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 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
GLA — SEA
Feb 25 — Mar 41
Wed 2/25
Wed 3/4
1 adult, Economy
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Cheap flight deals from Glasgow Intl to Seattle

Cheapest flights from Glasgow Intl to Seattle
Explore the most affordable flight options available from Glasgow Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/712:35 pm
GLA
-
SEA
1 stop12h 25m
Icelandair
Tue 3/173:35 pm
SEA
-
GLA
1 stop11h 20m
Icelandair
Deal found 1/24$427
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/812:35 pm
GLA
-
SEA
1 stop12h 25m
Icelandair
Tue 3/173:35 pm
SEA
-
GLA
1 stop11h 20m
Icelandair
Deal found 1/24$431
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1112:35 pm
GLA
-
SEA
1 stop12h 25m
Icelandair
Mon 3/163:35 pm
SEA
-
GLA
1 stop11h 20m
Icelandair
Deal found 1/24$453
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/97:35 am
GLA
-
SEA
1 stop17h 20m
British Airways
Sun 3/157:50 pm
SEA
-
GLA
1 stop16h 35m
British Airways
Deal found 1/24$515
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1010:50 am
GLA
-
SEA
1 stop14h 05m
British Airways
Sun 3/157:50 pm
SEA
-
GLA
1 stop16h 35m
British Airways
Deal found 1/24$516
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/612:35 pm
GLA
-
SEA
1 stop12h 25m
Icelandair
Tue 3/173:35 pm
SEA
-
GLA
1 stop11h 20m
Icelandair
Deal found 1/24$527
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/129:55 am
GLA
-
SEA
1 stop15h 00m
British Airways
Sun 3/157:50 pm
SEA
-
GLA
1 stop16h 35m
British Airways
Deal found 1/24$545
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:35 am
GLA
-
SEA
1 stop12h 55m
British Airways
Sun 3/157:50 pm
SEA
-
GLA
1 stop13h 50m
British Airways
Deal found 1/24$546
This Mytrip deal was found by Cheapflights users on 1/23. 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.
Wed 3/412:35 pm
GLA
-
SEA
1 stop12h 25m
Icelandair
Sun 3/83:35 pm
SEA
-
GLA
1 stop11h 20m
Icelandair
Deal found 1/23$581
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/612:35 pm
GLA
-
SEA
1 stop12h 25m
Icelandair
Fri 3/133:35 pm
SEA
-
GLA
1 stop11h 20m
Icelandair
Deal found 1/24$591
This deal was found by Cheapflights users on 1/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/812:35 pm
GLA
-
SEA
1 stop12h 25m
Icelandair
Fri 3/133:35 pm
SEA
-
GLA
1 stop11h 20m
Icelandair
Deal found 1/24$595
This Cheapflightsfares deal was found by Cheapflights users on 1/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/612:35 pm
GLA
-
SEA
1 stop12h 25m
Icelandair
Tue 2/102:35 pm
SEA
-
GLA
1 stop11h 20m
Icelandair
Deal found 1/24$596

Find flight deals from Glasgow Intl to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Glasgow Intl (GLA) 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 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$427

Popular in

July

Cheapest in

January

Average price

$656
Provider with most accurate pricing for Glasgow Intl-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Glasgow Intl-Seattle/Tacoma Intl flights.
Search Deals
From Glasgow Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($174 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Glasgow 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 26, 2026.
Use the filters below to find and compare flights from Glasgow Intl Airport to Seattle that are best for you.

Fly from

Glasgow Intl

Fly to

Seattle

Route

Depart

Return

Price

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Thu 3/12

12:35 pm-6:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Tue 3/17

3:35 pm-9:55 am

1 stop11h 20m

$427

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Sat 3/7

12:35 pm-5:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Mon 3/16

3:35 pm-9:55 am

1 stop11h 20m

$427

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Mon 3/9

12:35 pm-6:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Tue 3/17

3:35 pm-9:55 am

1 stop11h 20m

$427

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Mon 3/9

12:35 pm-6:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Mon 3/16

3:35 pm-9:55 am

1 stop11h 20m

$427

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Tue 3/10

12:35 pm-6:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Tue 3/17

3:35 pm-9:55 am

1 stop11h 20m

$427

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Sat 3/7

12:35 pm-5:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Tue 3/17

3:35 pm-9:55 am

1 stop11h 20m

$427

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Thu 3/12

12:35 pm-6:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Mon 3/16

3:35 pm-9:55 am

1 stop11h 20m

$427

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Sun 3/8

12:35 pm-6:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Mon 3/16

3:35 pm-9:55 am

1 stop11h 20m

$431

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Wed 3/11

12:35 pm-6:00 pm

1 stop12h 25m

Seattle/Tacoma Intl

Mon 3/16

3:35 pm-9:55 am

1 stop11h 20m

$453

GlasgowSeattle

GLA - SEA

GLASEA

Glasgow Intl

Mon 3/9

7:35 am-5:55 pm

1 stop17h 20m

Seattle/Tacoma Intl

Sun 3/15

7:50 pm-7:25 pm

1 stop16h 35m

$515

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/24

Showing 1-10 of 22 results
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Compare providers for flights from Glasgow Intl to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Glasgow Intl to Seattle in January.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Glasgow Intl Airport-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Glasgow Intl Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Glasgow Intl Airport-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Glasgow Intl Airport-Seattle flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Glasgow Intl Airport-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Glasgow Intl to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Glasgow 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.

Cheapflights Insights

Everything you need to know about your flight from Glasgow Intl Airport to Seattle

How far ahead should I book a flight from Glasgow Intl Airport to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Glasgow Intl to Seattle. Price data was last updated on January 23, 2026.

Booking 70 days in advance of your planned departure date is, on average, the best time to get cheap flights from Glasgow Intl Airport to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Glasgow Intl Airport to Seattle?

Currently, March is the cheapest month in which you can book a flight from Glasgow Intl Airport to Seattle (average of $488). Flying from Glasgow Intl Airport to Seattle in December is currently the most expensive (average of $796). 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.

How much does it cost to fly round-trip from Glasgow Intl Airport to Seattle?

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 January 26, 2026.
Peruse reviews from past customers who have flown with British Airways from Glasgow Intl Airport to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
British Airways
6.7
Okay
7,700 reviews

Boarding

6.9

Overall

6.7

Entertainment

6.4

Food

6.4

Comfort

6.8

Crew

7.6

Reviews

1 / 20
6.0
Good

Roxanne,Sep 2025

LHR - IAD

Food was mediocre. Couldn't use headphones because no information on how to use. Staff paid so much attention on a family with a baby . They got VIP treatment.
British Airways
6.7
Okay
7,700 reviews
British Airways
6.7
Okay
7,700 reviews

Boarding

6.9

Overall

6.7

Entertainment

6.4

Food

6.4

Comfort

6.8

Crew

7.6

Reviews

1 / 20
6.0
Good

Roxanne,Sep 2025

LHR - IAD

Food was mediocre. Couldn't use headphones because no information on how to use. Staff paid so much attention on a family with a baby . They got VIP treatment.

Related info for your journey

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

    Located just 11.4 mi from the city center, Seattle/Tacoma Intl is the airport most travelers will use when flying to Seattle from Glasgow Intl. Booking flights from Glasgow Intl to Seattle/Tacoma Intl (SEA) should be relatively easy as there are 0 daily inbound flights from Glasgow Intl from 1 airline.

  • How long is the flight from Glasgow Intl Airport to Seattle?

    A quick flight from Glasgow Intl Airport to Seattle can take about 12h 25m. Icelandair provides one of the quickest options available for as low as $427. The distance from Glasgow Intl Airport to Seattle is about 4445 mi.

  • What is the cheapest airline to fly from Glasgow Intl Airport to Seattle round-trip?

    Flying on British Airways is currently your cheapest option to Seattle, with prices starting at $814. British Airways is currently priced 1% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from Glasgow Intl Airport to Seattle one-way?

    For one-way options, check prices for Icelandair. According to our data, you can fly for as low as $582. Users have also found prices from $609 and $633 on Aer Lingus and British Airways, respectively.

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

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

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

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

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

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

    Currently, March is the cheapest month in which you can book a flight from Glasgow Intl Airport to Seattle (average of $488). Flying from Glasgow Intl Airport to Seattle in December is currently the most expensive (average of $796). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Lacey
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Glasgow Intl to Seattle

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

Top airline flying from Glasgow Intl to Seattle

Discover the top airline that operate flights from Glasgow Intl to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$814Average$916FlexibilityNo cancel feeOn-time70%

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