$408+ Cheap flights from Seattle (SEA) to Keflavik Intl (KEF)
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 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
Nov 22 — Nov 291
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Keflavik Intl 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.Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Reykjavik Keflavik Intl are usually found in May or January, booked 59 days in advance, depart on a Wednesday or Sunday and return on a Thursday
Cheap flight deals from Seattle to Keflavik Intl
Cheapest
Best
Last-minute
One-way
Cheapest flights from Seattle to Keflavik IntlExplore the most affordable flight options available from Seattle to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 23, 2026.
Explore the most affordable flight options available from Seattle to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 23, 2026.
This United Airlines deal was found by Cheapflights users on 10/22. 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 10/297:04 pm -
2 stops31h 56m
Thu 11/512:00 pm -
2 stops36h 12m
Deal found 10/22![United Airlines logo]()
$484
This United Airlines deal was found by Cheapflights users on 10/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:23 pm -
2 stops56h 37m
Mon 11/1612:00 pm -
2 stops29h 47m
Deal found 10/18![United Airlines logo]()
$508
This United deal was found by Cheapflights users on 10/18. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:50 pm -
1 stop15h 30m
Mon 12/712:00 pm -
1 stop18h 43m
Deal found 10/18![Multiple Airlines logo]()
$510
This United Airlines deal was found by Cheapflights users on 10/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:20 pm -
3 stops61h 40m
Mon 11/1612:00 pm -
2 stops29h 47m
Deal found 10/19![United Airlines logo]()
$514
This United deal was found by Cheapflights users on 10/19. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/112:50 pm -
1 stop15h 30m
Mon 11/1612:00 pm -
2 stops29h 47m
Deal found 10/19![Multiple Airlines logo]()
$515
This United deal was found by Cheapflights users on 10/21. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/297:04 pm -
2 stops31h 56m
Thu 11/53:10 pm -
1 stop29h 50m
Deal found 10/21![Multiple Airlines logo]()
$526
This Ovago deal was found by Cheapflights users on 10/20. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2510:50 am -
1 stop16h 10m
Mon 11/212:00 pm -
1 stop19h 07m
Deal found 10/20![Multiple Airlines logo]()
$542
This Globehunters deal was found by Cheapflights users on 10/20. 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 Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/121:50 pm -
1 stop16h 35m
Thu 11/193:10 pm -
1 stop29h 50m
Deal found 10/20![Lufthansa logo]()
$543
Best flights from Seattle to Keflavik IntlDiscover carefully curated flight deals from Seattle to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 23, 2026.
Discover carefully curated flight deals from Seattle to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 23, 2026.
This United Airlines deal was found by Cheapflights users on 10/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:04 pm -
2 stops30h 56m
Thu 11/1912:00 pm -
1 stop19h 07m
Deal found 10/20![United Airlines logo]()
$508
This United deal was found by Cheapflights users on 10/18. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:50 pm -
1 stop15h 30m
Mon 12/712:00 pm -
2 stops17h 58m
Deal found 10/18![Multiple Airlines logo]()
$515
This Icelandair deal was found by Cheapflights users on 10/23. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/166:50 pm -
1 stop27h 25m
Mon 2/225:00 pm -
Nonstop8h 00m
Deal found 10/23![Icelandair logo]()
$844
This KLM deal was found by Cheapflights users on 10/20. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/119:55 pm -
1 stop28h 35m
Wed 4/288:15 am -
2 stops17h 23m
Deal found 10/20![Multiple Airlines logo]()
$641
This United Airlines deal was found by Cheapflights users on 10/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/112:25 pm -
2 stops37h 35m
Mon 12/712:00 pm -
1 stop18h 43m
Deal found 10/18![United Airlines logo]()
$648
This United deal was found by Cheapflights users on 10/18. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/132:30 pm -
1 stop11h 30m
Sun 11/153:20 pm -
1 stop28h 40m
Deal found 10/18![Multiple Airlines logo]()
$660
This United deal was found by Cheapflights users on 10/21. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/103:35 pm -
2 stops34h 25m
Tue 11/173:20 pm -
1 stop28h 40m
Deal found 10/21![Multiple Airlines logo]()
$723
This United deal was found by Cheapflights users on 10/22. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1310:48 am -
1 stop15h 12m
Sun 12/203:20 pm -
1 stop28h 40m
Deal found 10/22![Multiple Airlines logo]()
$742
This United deal was found by Cheapflights users on 10/21. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/174:39 pm -
2 stops33h 21m
Tue 11/243:20 pm -
1 stop28h 40m
Deal found 10/21![Multiple Airlines logo]()
$815
This United deal was found by Cheapflights users on 10/22. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:05 am -
2 stops20h 55m
Sun 11/83:20 pm -
1 stop28h 40m
Deal found 10/22![Multiple Airlines logo]()
$815
This United deal was found by Cheapflights users on 10/18. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/277:00 am -
1 stop19h 00m
Sun 11/293:20 pm -
1 stop28h 40m
Deal found 10/18![Multiple Airlines logo]()
$862
Last-minute flights from Seattle to Keflavik IntlDiscover last-minute flight deals from Seattle to Keflavik Intl. Data last updated October 23, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Keflavik Intl. Data last updated October 23, 2026 and is based on user searches.
This Ovago deal was found by Cheapflights users on 10/20. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/2510:50 am -
1 stop16h 10m
Mon 11/212:00 pm -
1 stop19h 07m
Deal found 10/20![Multiple Airlines logo]()
$542
This United Airlines deal was found by Cheapflights users on 10/22. 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 10/297:04 pm -
2 stops31h 56m
Thu 11/512:00 pm -
2 stops36h 12m
Deal found 10/22![United Airlines logo]()
$484
This United deal was found by Cheapflights users on 10/21. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/297:04 pm -
2 stops31h 56m
Thu 11/53:10 pm -
1 stop29h 50m
Deal found 10/21![Multiple Airlines logo]()
$526
This Kiwi.com deal was found by Cheapflights users on 10/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/293:35 pm -
Nonstop7h 40m
Thu 11/55:00 pm -
Nonstop8h 00m
Deal found 10/21![Icelandair logo]()
$549
This United Airlines deal was found by Cheapflights users on 10/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/63:49 pm -
2 stops58h 11m
Thu 11/1912:00 pm -
1 stop15h 03m
Deal found 10/18![United Airlines logo]()
$508
This United Airlines deal was found by Cheapflights users on 10/19. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:20 pm -
3 stops61h 40m
Mon 11/1612:00 pm -
2 stops29h 47m
Deal found 10/19![United Airlines logo]()
$514
This United deal was found by Cheapflights users on 10/19. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/112:50 pm -
1 stop15h 30m
Mon 11/1612:00 pm -
2 stops29h 47m
Deal found 10/19![Multiple Airlines logo]()
$515
This KAYAK deal was found by Cheapflights users on 10/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/112:50 pm -
1 stop15h 30m
Mon 11/1612:00 pm -
1 stop19h 07m
Deal found 10/19![Lufthansa logo]()
$560
This Globehunters deal was found by Cheapflights users on 10/20. 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 Globehunters is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/121:50 pm -
1 stop16h 35m
Thu 11/193:10 pm -
1 stop29h 50m
Deal found 10/20![Lufthansa logo]()
$543
One-way flights from Seattle to Keflavik IntlSearch for one-way flight options from Seattle to Keflavik Intl. Find affordable one-way fares based on user searches. Data last updated October 23, 2026.
Search for one-way flight options from Seattle to Keflavik Intl. Find affordable one-way fares based on user searches. Data last updated October 23, 2026.
This American Airlines deal was found by Cheapflights users on 10/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/76:45 pm -
1 stop32h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![American Airlines logo]()
$408
This Expedia deal was found by Cheapflights users on 10/22. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/312:10 pm -
1 stop15h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Lufthansa logo]()
$415
This Travelocity deal was found by Cheapflights users on 10/19. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/11:50 pm -
1 stop16h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Lufthansa logo]()
$428
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/102:30 pm -
2 stops33h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Multiple Airlines logo]()
$431
This American Airlines deal was found by Cheapflights users on 10/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/78:21 am -
2 stops18h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Multiple Airlines logo]()
$433
This Finnair deal was found by Cheapflights users on 10/19. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/16:45 pm -
2 stops38h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Finnair logo]()
$437
This oojo deal was found by Cheapflights users on 10/19. 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.
Thu 11/122:35 pm -
Nonstop7h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Icelandair logo]()
$446
This Kiwi.com deal was found by Cheapflights users on 10/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/152:30 pm -
2 stops19h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Multiple Airlines logo]()
$447
This oojo deal was found by Cheapflights users on 10/20. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/42:35 pm -
Nonstop7h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Icelandair logo]()
$456
This oojo deal was found by Cheapflights users on 10/19. 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.
Mon 12/282:35 pm -
Nonstop7h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Icelandair logo]()
$457
Find flight deals from Seattle to Keflavik Intl
Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Keflavik Intl (KEF). 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 October 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $497 (United Airlines) |
One-way from | $408 (American Airlines) |
Popular in | December |
Cheapest in | May |
Average price | $590 |
Good round-trip deal | $557 or less |
Good one-way deal | $344 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Seattle to Keflavik Intl 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 October 23, 2026.
Use the filters below to find and compare flights from Seattle to Reykjavik Keflavik Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Wed 3/31
2:10 pm-12:55 pm
1 stop15h 45m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$415
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Sun 3/7
2:50 pm-3:50 pm
3 stops41h 00m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$434
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Wed 3/31
1:35 pm-7:50 am
2 stops35h 15m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$437
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Mon 2/15
6:45 pm-5:15 pm
2 stops38h 30m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$437
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Mon 2/1
6:45 pm-5:15 pm
2 stops38h 30m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$437
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Fri 1/15
11:00 am-5:35 pm
3 stops22h 35m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$448
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Sat 3/6
1:50 pm-6:45 pm
3 stops44h 55m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$461
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Thu 11/12
2:30 pm-9:45 am
3 stops35h 15m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$461
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Thu 11/12
7:04 pm-10:00 am
2 stops30h 56m
Reykjavik Keflavik Intl
Thu 11/19
12:00 pm-11:07 pm
1 stop19h 07m
$508
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Wed 12/2
2:50 pm-2:20 pm
1 stop15h 30m
Reykjavik Keflavik Intl
Mon 12/7
12:00 pm-9:58 pm
2 stops17h 58m
$515
Showing 1-10 of 23 resultsSorted by cheapest first
Compare providers for flights from Seattle to Keflavik Intl
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 Seattle to Keflavik Intl in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Seattle-Reykjavik Keflavik Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Reykjavik Keflavik Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Reykjavik Keflavik Intl Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Seattle-Reykjavik Keflavik Intl Airport 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 Seattle-Reykjavik Keflavik Intl Airport 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 Seattle to Keflavik Intl
Have a flexible travel schedule? Discover the best time to fly to Keflavik Intl from Seattle with our price prediction graph.
SEA-KEF
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 Seattle to Reykjavik Keflavik Intl Airport
How far ahead should I book a flight from Seattle to Reykjavik Keflavik Intl Airport?
The price you pay for your flight from Seattle to Reykjavik Keflavik Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 58 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Seattle to Reykjavik Keflavik Intl Airport?
Currently, May is the cheapest month in which you can book a flight from Seattle to Reykjavik Keflavik Intl Airport (average of $545). Flying from Seattle to Reykjavik Keflavik Intl Airport in December is currently the most expensive (average of $975). 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.
What is the cheapest time of day to fly from SEA to KEF?
Find hourly flight availability from Seattle to Keflavik Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 23, 2026.
When flying from Seattle to Reykjavik Keflavik Intl Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Reviews of airlines servicing Keflavik Intl
Get insights into the airlines that provide service to Keflavik Intl. 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 Keflavik Intl. Reviews last updated October 23, 2026.
Read through reviews of airlines operating flights from Seattle to Reykjavik Keflavik Intl Airport, such as Alaska Airlines and Icelandair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Food
7.0
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Related info for your journey
Find useful and relevant information for your journey from Seattle to Keflavik Intl. 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 Reykjavik Keflavik Intl Airport?
Book flights to Reykjavik Keflavik Intl Airport if you plan to visit one of these locationsHveragerdi
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Other flights to Keflavik Intl
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Top 2 airlines flying from Seattle to Keflavik Intl
Discover the top 2 airlines that operate flights from Seattle to Keflavik Intl. 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 7,457,451 searches. Data last updated October 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$426 | Average$649 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$496 | Average$841 | FlexibilityNo cancel fee | On-time75% |