$490+ Cheap flights from Keflavik Intl (KEF) 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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — SEA
Sep 19 — Sep 261
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Keflavik Intl 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 Keflavik Intl to Seattle
Cheapest
Best
Last-minute
One-way
Cheapest flights from Keflavik Intl to SeattleExplore the most affordable flight options available from Keflavik Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2026.
Explore the most affordable flight options available from Keflavik Intl to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2026.
This Ticket deal was found by Cheapflights users on 8/19. 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 Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/17:45 pm -
Nonstop7h 55m
Wed 10/77:00 pm -
Nonstop7h 25m
Deal found 8/19![Icelandair logo]()
$592
This Gotogate deal was found by Cheapflights users on 8/18. 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.
Fri 10/27:45 pm -
Nonstop7h 55m
Fri 10/97:00 pm -
Nonstop7h 25m
Deal found 8/18![Icelandair logo]()
$642
This Gotogate deal was found by Cheapflights users on 8/20. 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.
Fri 10/27:45 pm -
Nonstop7h 55m
Sat 10/107:00 pm -
Nonstop7h 25m
Deal found 8/20![Icelandair logo]()
$647
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/49:00 am -
1 stop29h 20m
Sun 9/137:35 pm -
1 stop29h 05m
Deal found 8/16![Multiple Airlines logo]()
$649
This Gotogate deal was found by Cheapflights users on 8/16. 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.
Fri 9/410:40 am -
Nonstop8h 05m
Sun 9/137:00 pm -
Nonstop7h 25m
Deal found 8/16![Icelandair logo]()
$662
Best flights from Keflavik Intl to SeattleDiscover carefully curated flight deals from Keflavik Intl to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 20, 2026.
Discover carefully curated flight deals from Keflavik Intl to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 20, 2026.
This Icelandair deal was found by Cheapflights users on 8/18. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/17:45 pm -
Nonstop7h 55m
Wed 10/712:58 pm -
1 stop10h 37m
Deal found 8/18![Multiple Airlines logo]()
$833
This Delta deal was found by Cheapflights users on 8/19. 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.
Fri 9/1811:25 am -
1 stop29h 55m
Thu 9/2411:59 pm -
1 stop24h 01m
Deal found 8/19![Delta logo]()
$916
This Mytrip deal was found by Cheapflights users on 8/16. 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.
Fri 9/49:00 am -
2 stops20h 42m
Sun 9/135:50 am -
3 stops18h 50m
Deal found 8/16![Multiple Airlines logo]()
$896
This Delta deal was found by Cheapflights users on 8/19. 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 10/111:25 am -
2 stops17h 40m
Wed 10/77:20 am -
2 stops19h 10m
Deal found 8/19![Delta logo]()
$944
Last-minute flights from Keflavik Intl to SeattleDiscover last-minute flight deals from Keflavik Intl to Seattle. Data last updated August 20, 2026 and is based on user searches.
Discover last-minute flight deals from Keflavik Intl to Seattle. Data last updated August 20, 2026 and is based on user searches.
This Gotogate deal was found by Cheapflights users on 8/17. 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.
Tue 9/110:40 am -
Nonstop8h 05m
Tue 9/111:25 pm -
Nonstop7h 35m
Deal found 8/17![Icelandair logo]()
$820
This Kiwi.com deal was found by Cheapflights users on 8/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/49:00 am -
1 stop29h 20m
Sun 9/137:35 pm -
1 stop29h 05m
Deal found 8/16![Multiple Airlines logo]()
$649
This Gotogate deal was found by Cheapflights users on 8/16. 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.
Fri 9/410:40 am -
Nonstop8h 05m
Sun 9/137:00 pm -
Nonstop7h 25m
Deal found 8/16![Icelandair logo]()
$662
This Delta deal was found by Cheapflights users on 8/17. 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.
Tue 9/1511:25 am -
1 stop29h 55m
Tue 9/2212:00 pm -
1 stop12h 00m
Deal found 8/17![Delta logo]()
$901
This Kiwi.com deal was found by Cheapflights users on 8/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/187:45 pm -
Nonstop7h 55m
Thu 9/247:00 pm -
Nonstop7h 25m
Deal found 8/19![Icelandair logo]()
$899
This Delta deal was found by Cheapflights users on 8/19. 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.
Fri 9/1811:25 am -
1 stop29h 55m
Thu 9/2411:59 pm -
1 stop24h 01m
Deal found 8/19![Delta logo]()
$916
This oojo deal was found by Cheapflights users on 8/19. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/184:50 pm -
1 stop23h 47m
Thu 9/246:31 pm -
1 stop29h 04m
Deal found 8/19![Multiple Airlines logo]()
$953
One-way flights from Keflavik Intl to SeattleSearch for one-way flight options from Keflavik Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated August 20, 2026.
Search for one-way flight options from Keflavik Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated August 20, 2026.
This Mytrip deal was found by Cheapflights users on 8/18. 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.
Mon 10/265:00 pm -
Nonstop8h 00m
Deal found 8/18![Icelandair logo]()
$490
This Mytrip deal was found by Cheapflights users on 8/18. 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.
Thu 10/17:45 pm -
Nonstop7h 55m
Deal found 8/18![Icelandair logo]()
$491
This Mytrip deal was found by Cheapflights users on 8/16. 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.
Thu 10/87:45 pm -
Nonstop7h 55m
Deal found 8/16![Icelandair logo]()
$492
This Gotogate deal was found by Cheapflights users on 8/19. 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.
Thu 10/295:00 pm -
Nonstop8h 00m
Deal found 8/19![Icelandair logo]()
$495
This Mytrip deal was found by Cheapflights users on 8/16. 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.
Tue 10/67:45 pm -
Nonstop7h 55m
Deal found 8/16![Icelandair logo]()
$496
This Ovago deal was found by Cheapflights users on 8/16. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/29:00 am -
2 stops17h 03m
Deal found 8/16![WestJet logo]()
$497
This Super.com deal was found by Cheapflights users on 8/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/47:45 pm -
Nonstop7h 55m
Deal found 8/17![Icelandair logo]()
$498
This oojo deal was found by Cheapflights users on 8/16. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/137:45 pm -
Nonstop7h 55m
Deal found 8/16![Icelandair logo]()
$499
This Mytrip deal was found by Cheapflights users on 8/16. 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 9/29:00 am -
3 stops20h 42m
Deal found 8/16![Multiple Airlines logo]()
$504
This FlightHub deal was found by Cheapflights users on 8/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/27:45 pm -
Nonstop7h 55m
Deal found 8/17![Icelandair logo]()
$506
Find flight deals from Keflavik Intl to Seattle
Discover tips and strategies to find the most affordable flight options for your journey from Keflavik Intl (KEF) 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 August 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $592 (Ticket) |
One-way from | $490 (Mytrip) |
Good round-trip deal | $786 or less |
Good one-way deal | $657 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Keflavik 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 7,457,451 searches. Data last updated August 20, 2026.
Use the filters below to find and compare flights from Reykjavik Keflavik Intl Airport to Seattle that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Thu 10/1
7:45 pm-8:40 pm
Nonstop7h 55m
Seattle/Tacoma Intl
Wed 10/7
12:58 pm-6:35 am
1 stop10h 37m
$833
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Fri 9/4
9:00 am-10:42 pm
2 stops20h 42m
Seattle/Tacoma Intl
Sun 9/13
5:50 am-7:40 am
3 stops18h 50m
$896
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Fri 9/18
11:25 am-10:20 am
1 stop29h 55m
Seattle/Tacoma Intl
Thu 9/24
11:59 pm-7:00 am
1 stop24h 01m
$916
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Thu 10/1
11:25 am-10:05 pm
2 stops17h 40m
Seattle/Tacoma Intl
Wed 10/7
7:20 am-9:30 am
2 stops19h 10m
$944
Cheapest one-way
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Sat 1/9
5:00 pm-5:00 pm
Nonstop8h 00m
$506
Quickest one-way
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Tue 10/6
7:45 pm-8:40 pm
Nonstop7h 55m
$514
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Wed 10/7
4:50 pm-5:55 pm
Nonstop8h 05m
$611
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Mon 9/7
10:40 am-11:45 am
Nonstop8h 05m
$636
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Tue 9/8
4:45 pm-3:08 pm
2 stops29h 23m
$689
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Tue 10/13
5:15 pm-12:36 am
2 stops38h 21m
$715
Showing 1-10 of 15 resultsSorted by cheapest first
- Most accurate provider: When it comes to deals on Reykjavik Keflavik 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 Reykjavik Keflavik Intl Airport-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Reykjavik Keflavik Intl Airport-Seattle flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Reykjavik Keflavik 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 Reykjavik Keflavik 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 Keflavik Intl to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Keflavik Intl with our price prediction graph.
KEF-SEA
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 Reykjavik Keflavik Intl Airport to Seattle
Prices
Airlines
Related info for your journey
Find useful and relevant information for your journey from Keflavik Intl to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
Renton
Tacoma
Lacey
Leavenworth
Tukwila
Olympia
Edmonds
Snoqualmie
Lynnwood
Tumwater
Centralia
Puyallup
Kent
Marysville
Ellensburg
Ocean Shores
Lakewood
Fife
Poulsbo
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
Complete your trip
Flights by cabin class
Other flight options
Other flights from Keflavik Intl
Popular flights
Seattle flight routes