$304+ 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — KEF
Oct 10 — Oct 171
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 90 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 September 10, 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 September 10, 2026.
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Sat 10/173:40 pm -
Nonstop7h 35m
Mon 10/265:00 pm -
Nonstop8h 00m
Deal found 9/8![Icelandair logo]()
$459
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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.
Mon 10/123:40 pm -
Nonstop7h 35m
Mon 10/265:00 pm -
Nonstop8h 00m
Deal found 9/9![Icelandair logo]()
$461
This Delta deal was found by Cheapflights users on 9/5. 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.
Wed 9/306:00 am -
1 stop18h 00m
Thu 10/1511:25 am -
1 stop18h 39m
Deal found 9/5![Delta logo]()
$473
This KLM deal was found by Cheapflights users on 9/5. 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.
Fri 9/1110:40 pm -
1 stop27h 50m
Tue 9/229:30 am -
1 stop21h 25m
Deal found 9/5![Multiple Airlines logo]()
$478
This Delta deal was found by Cheapflights users on 9/8. 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.
Sat 10/1010:59 pm -
1 stop27h 31m
Thu 10/1511:25 am -
1 stop18h 39m
Deal found 9/8![Delta logo]()
$481
This Delta deal was found by Cheapflights users on 9/6. 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 9/1111:50 am -
1 stop14h 40m
Thu 9/1711:25 am -
1 stop18h 55m
Deal found 9/6![Delta logo]()
$487
This KLM deal was found by Cheapflights users on 9/6. 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.
Sat 9/126:00 am -
2 stops20h 30m
Thu 9/1711:25 am -
1 stop18h 55m
Deal found 9/6![Multiple Airlines logo]()
$491
This Delta deal was found by Cheapflights users on 9/5. 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.
Sat 9/56:05 pm -
1 stop29h 55m
Thu 9/2411:25 am -
1 stop15h 56m
Deal found 9/5![Delta logo]()
$492
This Delta deal was found by Cheapflights users on 9/9. 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 9/1111:59 pm -
1 stop24h 01m
Fri 9/189:30 am -
1 stop21h 25m
Deal found 9/9![Delta logo]()
$493
This Delta deal was found by Cheapflights users on 9/5. 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 9/104:01 pm -
1 stop34h 29m
Thu 9/2411:25 am -
1 stop15h 56m
Deal found 9/5![Delta logo]()
$495
This KLM deal was found by Cheapflights users on 9/7. 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.
Fri 9/115:50 pm -
2 stops32h 40m
Fri 9/1811:25 am -
1 stop18h 55m
Deal found 9/7![KLM logo]()
$497
This KLM deal was found by Cheapflights users on 9/5. 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.
Sat 9/55:50 pm -
2 stops30h 10m
Thu 9/2411:25 am -
1 stop18h 55m
Deal found 9/5![KLM logo]()
$498
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 September 10, 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 September 10, 2026.
This Delta deal was found by Cheapflights users on 9/9. 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.
Sun 10/45:50 pm -
2 stops32h 40m
Tue 10/1311:25 am -
1 stop18h 39m
Deal found 9/9![Delta logo]()
$587
This Virgin Atlantic deal was found by Cheapflights users on 9/5. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/47:15 am -
1 stop19h 15m
Mon 10/1211:25 am -
2 stops34h 25m
Deal found 9/5![Virgin Atlantic logo]()
$681
This United Airlines deal was found by Cheapflights users on 9/8. 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.
Sat 10/105:07 pm -
1 stop32h 43m
Wed 10/149:15 am -
3 stops42h 22m
Deal found 9/8![United Airlines logo]()
$756
This Delta deal was found by Cheapflights users on 9/9. 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 10/134:00 pm -
1 stop34h 30m
Thu 10/2211:25 am -
1 stop18h 39m
Deal found 9/9![Delta logo]()
$602
This United Airlines deal was found by Cheapflights users on 9/5. 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 12/112:19 pm -
1 stop11h 41m
Mon 12/1412:00 pm -
3 stops34h 18m
Deal found 9/5![United Airlines logo]()
$771
This United Airlines deal was found by Cheapflights users on 9/7. 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 10/2211:13 pm -
1 stop26h 37m
Thu 10/2912:00 pm -
1 stop14h 03m
Deal found 9/7![United Airlines logo]()
$776
This United Airlines deal was found by Cheapflights users on 9/9. 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 11/1210:56 pm -
1 stop27h 04m
Mon 11/1612:00 pm -
1 stop19h 07m
Deal found 9/9![United Airlines logo]()
$776
This United Airlines deal was found by Cheapflights users on 9/8. 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 12/13:30 pm -
2 stops34h 30m
Mon 12/712:00 pm -
1 stop18h 33m
Deal found 9/8![United Airlines logo]()
$779
Last-minute flights from Seattle to Keflavik IntlDiscover last-minute flight deals from Seattle to Keflavik Intl. Data last updated September 10, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Keflavik Intl. Data last updated September 10, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 9/5. 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 9/104:01 pm -
1 stop34h 29m
Thu 9/2411:25 am -
1 stop15h 56m
Deal found 9/5![Delta logo]()
$495
This KLM deal was found by Cheapflights users on 9/5. 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.
Fri 9/1110:40 pm -
1 stop27h 50m
Tue 9/229:30 am -
1 stop21h 25m
Deal found 9/5![Multiple Airlines logo]()
$478
This Delta deal was found by Cheapflights users on 9/6. 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 9/1111:50 am -
1 stop14h 40m
Wed 9/1611:25 am -
1 stop15h 56m
Deal found 9/6![Delta logo]()
$487
This Delta deal was found by Cheapflights users on 9/8. 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 9/1111:59 pm -
1 stop24h 01m
Fri 9/1811:25 am -
1 stop15h 56m
Deal found 9/8![Delta logo]()
$492
This KLM deal was found by Cheapflights users on 9/7. 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.
Fri 9/115:50 pm -
2 stops32h 40m
Fri 9/1811:25 am -
1 stop18h 55m
Deal found 9/7![KLM logo]()
$497
This KLM deal was found by Cheapflights users on 9/6. 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.
Sat 9/126:00 am -
2 stops20h 30m
Thu 9/1711:25 am -
1 stop18h 55m
Deal found 9/6![Multiple Airlines logo]()
$491
This Delta deal was found by Cheapflights users on 9/5. 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.
Wed 9/306:00 am -
1 stop18h 00m
Thu 10/1511:25 am -
1 stop18h 39m
Deal found 9/5![Delta logo]()
$473
This Delta deal was found by Cheapflights users on 9/8. 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.
Sat 10/1010:59 pm -
1 stop27h 31m
Thu 10/1511:25 am -
1 stop18h 39m
Deal found 9/8![Delta logo]()
$481
This BusinessClass deal was found by Cheapflights users on 9/8. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/117:15 am -
1 stop19h 15m
Thu 10/1511:25 am -
1 stop15h 44m
Deal found 9/8![Air Europa logo]()
$543
This Cheapflightsfares deal was found by Cheapflights users on 9/9. 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.
Mon 10/123:40 pm -
Nonstop7h 35m
Mon 10/265:00 pm -
Nonstop8h 00m
Deal found 9/9![Icelandair logo]()
$461
This Mytrip deal was found by Cheapflights users on 9/8. 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.
Sat 10/173:40 pm -
Nonstop7h 35m
Mon 10/265:00 pm -
Nonstop8h 00m
Deal found 9/8![Icelandair logo]()
$459
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 September 10, 2026.
Search for one-way flight options from Seattle to Keflavik Intl. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/8. 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 10/43:55 pm -
3 stops44h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Multiple Airlines logo]()
$304
This Kiwi.com deal was found by Cheapflights users on 9/5. 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 9/177:35 pm -
1 stop29h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![WestJet logo]()
$329
This Kiwi.com deal was found by Cheapflights users on 9/7. 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.
Sat 10/103:55 pm -
3 stops35h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Scandinavian Airlines logo]()
$340
This Kiwi.com deal was found by Cheapflights users on 9/7. 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.
Sat 10/107:35 pm -
2 stops53h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Multiple Airlines logo]()
$373
This Kiwi.com deal was found by Cheapflights users on 9/8. 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 10/43:55 pm -
1 stop34h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Scandinavian Airlines logo]()
$393
This American Airlines deal was found by Cheapflights users on 9/6. 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.
Wed 1/136:45 pm -
1 stop32h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![American Airlines logo]()
$407
This American Airlines deal was found by Cheapflights users on 9/6. 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.
Wed 1/133:44 pm -
2 stops35h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Multiple Airlines logo]()
$416
This American Airlines deal was found by Cheapflights users on 9/9. 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.
Tue 1/192:37 pm -
2 stops36h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![American Airlines logo]()
$428
This Kiwi.com deal was found by Cheapflights users on 9/6. 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 11/202:30 pm -
2 stops19h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Multiple Airlines logo]()
$431
This Kiwi.com deal was found by Cheapflights users on 9/6. 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 11/222:30 pm -
2 stops33h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Multiple Airlines logo]()
$432
This Mytrip deal was found by Cheapflights users on 9/6. 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 10/213:40 pm -
Nonstop7h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Icelandair logo]()
$433
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 September 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $459 (Mytrip) |
One-way from | $304 (Kiwi.com) |
Popular in | August |
Cheapest in | May |
Average price | $686 |
Good round-trip deal | $629 or less |
Good one-way deal | $314 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 September 10, 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
Thu 9/17
7:35 pm-7:40 am
1 stop29h 05m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$329
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Sun 10/25
3:35 pm-6:15 am
Nonstop7h 40m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$433
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Thu 10/15
7:00 pm-9:25 am
Nonstop7h 25m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$449
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Sun 10/25
3:50 pm-11:10 am
2 stops36h 20m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$478
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Wed 12/23
2:35 pm-6:15 am
Nonstop7h 40m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$498
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Sat 11/21
11:17 pm-10:00 am
2 stops26h 43m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$551
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Sun 10/25
10:50 am-10:00 am
1 stop16h 10m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$551
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Tue 11/24
12:20 pm-10:00 am
3 stops37h 40m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$557
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Thu 10/15
5:50 am-7:55 am
2 stops19h 05m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-4:00 pm
Nonstop0h 00m
$584
SeattleReykjavik
SEA Seattle/Tacoma Intl - KEF Reykjavik Keflavik Intl
SEAKEF
Seattle/Tacoma Intl
Sun 10/4
5:50 pm-9:30 am
2 stops32h 40m
Reykjavik Keflavik Intl
Tue 10/13
11:25 am-11:04 pm
1 stop18h 39m
$587
Showing 1-10 of 19 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 September.
| 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 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
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Airlines
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 89 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 August is currently the most expensive (average of $979). 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 September 10, 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 September 10, 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.
Entertainment
7.0
Crew
8.5
Overall
7.9
Comfort
7.8
Boarding
8.1
Food
7.0
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Entertainment
7.0
Crew
8.5
Overall
7.9
Comfort
7.8
Boarding
8.1
Food
7.0
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Entertainment
7.0
Crew
8.5
Overall
7.9
Comfort
7.8
Boarding
8.1
Food
7.0
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 locationsKeflavik
Hveragerdi
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Other flights to Keflavik Intl
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Seattle and Keflavik Intl flights
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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 September 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$414 | Average$645 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$496 | Average$832 | FlexibilityNo cancel fee | On-time75% |