$493+ Cheap flights from Keflavik Intl (KEF) 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — SEA
Oct 30 — Nov 61
Round-trip
1 adult, Economy
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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
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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 September 30, 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 September 30, 2026.
This Travelis deal was found by Cheapflights users on 9/27. 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 Travelis is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/205:00 pm -
Nonstop8h 00m
Thu 11/262:35 pm -
Nonstop7h 40m
Deal found 9/27![Icelandair logo]()
$628
This Ticket deal was found by Cheapflights users on 9/30. 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.
Mon 11/235:00 pm -
Nonstop8h 00m
Tue 12/12:35 pm -
Nonstop7h 40m
Deal found 9/30![Icelandair logo]()
$644
This FlightHub deal was found by Cheapflights users on 9/27. 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.
Mon 12/215:00 pm -
Nonstop8h 00m
Fri 1/12:35 pm -
Nonstop7h 40m
Deal found 9/27![Icelandair logo]()
$672
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
Tue 12/225:00 pm -
Nonstop8h 00m
Fri 1/12:35 pm -
Nonstop7h 40m
Deal found 9/27![Icelandair logo]()
$681
This Icelandair deal was found by Cheapflights users on 9/27. 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.
Fri 12/185:00 pm -
Nonstop8h 00m
Tue 1/52:35 pm -
Nonstop7h 40m
Deal found 9/27![Icelandair logo]()
$683
This FlightHub deal was found by Cheapflights users on 9/27. 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.
Mon 12/215:00 pm -
Nonstop8h 00m
Sun 1/32:35 pm -
Nonstop7h 40m
Deal found 9/27![Icelandair logo]()
$684
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
Tue 12/225:00 pm -
Nonstop8h 00m
Wed 12/302:35 pm -
Nonstop7h 40m
Deal found 9/27![Icelandair logo]()
$693
This Icelandair deal was found by Cheapflights users on 9/27. 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 12/175:00 pm -
Nonstop8h 00m
Tue 1/52:35 pm -
Nonstop7h 40m
Deal found 9/27![Icelandair logo]()
$695
This FlightHub deal was found by Cheapflights users on 9/27. 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.
Sat 12/195:00 pm -
Nonstop8h 00m
Sat 1/22:35 pm -
Nonstop7h 40m
Deal found 9/27![Icelandair logo]()
$696
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 September 30, 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 September 30, 2026.
This Booking.com deal was found by Cheapflights users on 9/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/235:00 pm -
Nonstop8h 00m
Tue 12/12:35 pm -
Nonstop7h 40m
Deal found 9/30![Icelandair logo]()
$658
This FlightHub deal was found by Cheapflights users on 9/29. 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 11/206:05 pm -
2 stops36h 55m
Thu 11/267:27 am -
2 stops25h 53m
Deal found 9/29![Scandinavian Airlines logo]()
$936
This flugladen.de deal was found by Cheapflights users on 9/28. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/124:55 pm -
1 stop24h 12m
Thu 11/193:41 pm -
1 stop30h 34m
Deal found 9/28![Multiple Airlines logo]()
$962
This United Airlines deal was found by Cheapflights users on 9/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/2312:00 pm -
1 stop35h 32m
Tue 12/15:35 pm -
2 stops32h 25m
Deal found 9/30![United Airlines logo]()
$989
This Gotogate deal was found by Cheapflights users on 9/29. 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 11/205:00 pm -
Nonstop8h 00m
Thu 11/2611:29 am -
1 stop10h 36m
Deal found 9/29![Icelandair logo]()
$799
This oojo deal was found by Cheapflights users on 9/28. 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 11/135:00 pm -
Nonstop8h 00m
Fri 11/209:37 pm -
1 stop24h 28m
Deal found 9/28![Icelandair logo]()
$873
This Flighttix deal was found by Cheapflights users on 9/28. 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 Flighttix is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:05 pm -
2 stops36h 55m
Thu 11/1910:39 am -
2 stops22h 41m
Deal found 9/28![Scandinavian Airlines logo]()
$961
This United Airlines deal was found by Cheapflights users on 9/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2112:00 pm -
1 stop15h 06m
Thu 12/3111:58 pm -
2 stops26h 02m
Deal found 9/27![United Airlines logo]()
$997
This United Airlines deal was found by Cheapflights users on 9/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1712:00 pm -
1 stop15h 06m
Sun 1/37:00 am -
1 stop19h 00m
Deal found 9/27![United Airlines logo]()
$997
Last-minute flights from Keflavik Intl to SeattleDiscover last-minute flight deals from Keflavik Intl to Seattle. Data last updated September 30, 2026 and is based on user searches.
Discover last-minute flight deals from Keflavik Intl to Seattle. Data last updated September 30, 2026 and is based on user searches.
This Gotogate deal was found by Cheapflights users on 9/30. 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 10/210:59 pm -
1 stop24h 16m
Deal found 9/30![Icelandair logo]()
$1,366
This Kiwi.com deal was found by Cheapflights users on 9/30. 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 10/24:50 pm -
Nonstop8h 05m
Fri 10/29:45 pm -
2 stops49h 50m
Deal found 9/30![Multiple Airlines logo]()
$1,508
This United Airlines deal was found by Cheapflights users on 9/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/29:15 am -
2 stops18h 22m
Fri 10/211:14 pm -
2 stops50h 36m
Deal found 9/30![United Airlines logo]()
$2,071
This Booking.com deal was found by Cheapflights users on 9/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/54:50 pm -
Nonstop8h 05m
Sun 10/117:00 pm -
Nonstop7h 25m
Deal found 9/30![Icelandair logo]()
$874
This Justfly.com deal was found by Cheapflights users on 9/30. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/55:05 pm -
1 stop27h 40m
Sun 10/113:55 pm -
1 stop34h 45m
Deal found 9/30![Scandinavian Airlines logo]()
$915
This Booking.com deal was found by Cheapflights users on 9/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/58:00 pm -
3 stops21h 05m
Sun 10/116:50 pm -
3 stops32h 35m
Deal found 9/30![Multiple Airlines logo]()
$2,104
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 September 30, 2026.
Search for one-way flight options from Keflavik Intl to Seattle. Find affordable one-way fares based on user searches. Data last updated September 30, 2026.
This Booking.com deal was found by Cheapflights users on 9/26. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/295:00 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Icelandair logo]()
$493
This Booking.com deal was found by Cheapflights users on 9/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/195:00 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Icelandair logo]()
$495
This Mytrip deal was found by Cheapflights users on 9/27. 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 1/135:00 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Icelandair logo]()
$498
This Kiwi.com deal was found by Cheapflights users on 9/29. 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.
Wed 11/1810:00 am -
3 stops59h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/29![Multiple Airlines logo]()
$512
This FlightHub deal was found by Cheapflights users on 9/27. 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 3/194:50 pm -
Nonstop8h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Icelandair logo]()
$515
This Kiwi.com deal was found by Cheapflights users on 9/26. 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.
Tue 10/275:00 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Icelandair logo]()
$518
This Kiwi.com deal was found by Cheapflights users on 9/30. 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.
Wed 1/65:00 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Icelandair logo]()
$521
This Icelandair deal was found by Cheapflights users on 9/26. 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.
Sun 10/255:00 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Icelandair logo]()
$524
This Kiwi.com deal was found by Cheapflights users on 9/30. 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.
Wed 10/286:05 pm -
3 stops55h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/30![Multiple Airlines logo]()
$546
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
Tue 1/55:00 pm -
Nonstop8h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Icelandair logo]()
$556
This Kiwi.com deal was found by Cheapflights users on 9/27. 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.
Wed 1/1310:30 am -
3 stops54h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/27![Multiple Airlines logo]()
$561
This Sembo deal was found by Cheapflights users on 9/26. 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 Sembo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/67:45 pm -
Nonstop7h 55m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/26![Icelandair logo]()
$601
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 September 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $628 (Travelis) |
One-way from | $493 (Booking.com) |
Good one-way deal | $724 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 September 30, 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
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Wed 11/18
10:00 am-1:40 pm
3 stops59h 40m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$512
Quickest round-trip
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Tue 10/27
5:00 pm-6:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$524
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Mon 11/23
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Tue 12/1
2:35 pm-6:15 am
Nonstop7h 40m
$658
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Sat 12/19
9:05 pm-4:50 pm
3 stops51h 45m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$661
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Wed 1/13
5:00 pm-12:17 pm
1 stop27h 17m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$680
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Tue 10/27
5:15 pm-3:12 pm
2 stops28h 57m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$740
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Wed 10/7
7:50 pm-9:44 am
1 stop20h 54m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$748
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Tue 10/13
4:25 pm-9:42 am
1 stop24h 17m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-8:00 am
Nonstop0h 00m
$762
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Fri 11/20
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Thu 11/26
11:29 am-6:05 am
1 stop10h 36m
$799
ReykjavikSeattle
KEF Reykjavik Keflavik Intl - SEA Seattle/Tacoma Intl
KEFSEA
Reykjavik Keflavik Intl
Fri 11/13
5:00 pm-5:00 pm
Nonstop8h 00m
Seattle/Tacoma Intl
Fri 11/20
9:37 pm-6:05 am
1 stop24h 28m
$873
Showing 1-10 of 19 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
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Traveling to a place near Seattle?
Book flights to Seattle if you plan to visit one of these locationsSeaTac
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