$593+ Cheap flights from St. Louis (STL) 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 11/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — KEF
Nov 19 — Nov 261
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from St. Louis 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.Cheap flight deals from St. Louis to Keflavik Intl
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to Keflavik IntlExplore the most affordable flight options available from St. Louis to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2026.
Explore the most affordable flight options available from St. Louis to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 20, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/15. 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 11/147:59 pm -
1 stop28h 06m
Sat 11/214:55 pm -
2 stops20h 59m
Deal found 10/15![Multiple Airlines logo]()
$789
This Finnair deal was found by Cheapflights users on 10/17. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/710:25 am -
2 stops24h 50m
Mon 12/1410:00 am -
2 stops42h 20m
Deal found 10/17![Multiple Airlines logo]()
$790
This United Airlines deal was found by Cheapflights users on 10/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/89:40 am -
1 stop18h 20m
Thu 11/1912:00 pm -
1 stop12h 09m
Deal found 10/17![United Airlines logo]()
$811
This Finnair deal was found by Cheapflights users on 10/16. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/3010:21 am -
2 stops24h 54m
Mon 12/710:00 am -
2 stops40h 27m
Deal found 10/16![Multiple Airlines logo]()
$821
This United Airlines deal was found by Cheapflights users on 10/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/71:00 pm -
2 stops39h 00m
Thu 11/1912:00 pm -
2 stops26h 53m
Deal found 10/16![United Airlines logo]()
$827
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.
Thu 12/311:05 am -
2 stops40h 55m
Thu 12/1012:00 pm -
2 stops16h 31m
Deal found 10/19![United Airlines logo]()
$828
This Icelandair 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/68:25 am -
1 stop16h 10m
Thu 12/105:00 pm -
1 stop21h 10m
Deal found 10/18![Multiple Airlines logo]()
$844
This Scandinavian Airlines deal was found by Cheapflights users on 10/16. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:29 pm -
2 stops22h 51m
Thu 11/1911:35 am -
2 stops42h 21m
Deal found 10/16![Scandinavian Airlines logo]()
$845
This FlightHub deal was found by Cheapflights users on 10/17. 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.
Wed 11/113:40 pm -
1 stop16h 45m
Tue 11/173:20 pm -
1 stop28h 25m
Deal found 10/17![Lufthansa logo]()
$850
This KAYAK deal was found by Cheapflights users on 10/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/91:00 pm -
2 stops19h 25m
Thu 11/193:10 pm -
2 stops38h 14m
Deal found 10/17![Lufthansa logo]()
$852
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.
Mon 11/165:00 pm -
2 stops59h 00m
Mon 11/2312:00 pm -
1 stop15h 40m
Deal found 10/19![United Airlines logo]()
$853
Best flights from St. Louis to Keflavik IntlDiscover carefully curated flight deals from St. Louis to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 20, 2026.
Discover carefully curated flight deals from St. Louis to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 20, 2026.
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/283:40 pm -
2 stops36h 50m
Wed 3/3111:25 am -
2 stops17h 14m
Deal found 10/19![Delta logo]()
$772
This Finnair deal was found by Cheapflights users on 10/15. 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 2/2210:20 am -
2 stops24h 55m
Mon 3/16:00 pm -
2 stops35h 10m
Deal found 10/15![Multiple Airlines logo]()
$782
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.
Thu 12/33:00 pm -
2 stops37h 00m
Thu 12/1012:00 pm -
1 stop10h 24m
Deal found 10/19![United Airlines logo]()
$828
This United deal was found by Cheapflights users on 10/15. 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 11/128:00 am -
2 stops44h 00m
Thu 11/193:20 pm -
1 stop28h 25m
Deal found 10/15![Multiple Airlines logo]()
$861
This Icelandair 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/31:55 pm -
1 stop10h 35m
Sun 3/75:00 pm -
1 stop12h 55m
Deal found 10/19![Multiple Airlines logo]()
$869
This Icelandair 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/241:55 pm -
1 stop10h 35m
Sat 1/305:00 pm -
1 stop27h 55m
Deal found 10/19![Multiple Airlines logo]()
$879
This Icelandair deal was found by Cheapflights users on 10/17. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/311:45 pm -
1 stop10h 45m
Sat 2/65:00 pm -
1 stop27h 55m
Deal found 10/17![Multiple Airlines logo]()
$879
Last-minute flights from St. Louis to Keflavik IntlDiscover last-minute flight deals from St. Louis to Keflavik Intl. Data last updated October 20, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Keflavik Intl. Data last updated October 20, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 10/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/71:00 pm -
2 stops39h 00m
Thu 11/1912:00 pm -
2 stops26h 53m
Deal found 10/16![United Airlines logo]()
$827
This United Airlines deal was found by Cheapflights users on 10/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/89:40 am -
1 stop18h 20m
Thu 11/1912:00 pm -
1 stop12h 09m
Deal found 10/17![United Airlines logo]()
$811
This KAYAK deal was found by Cheapflights users on 10/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/91:00 pm -
2 stops19h 25m
Thu 11/193:10 pm -
2 stops38h 14m
Deal found 10/17![Lufthansa logo]()
$852
This KAYAK deal was found by Cheapflights users on 10/17. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:50 pm -
2 stops37h 35m
Thu 11/193:10 pm -
2 stops38h 14m
Deal found 10/17![Lufthansa logo]()
$857
This Scandinavian Airlines deal was found by Cheapflights users on 10/16. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:29 pm -
2 stops22h 51m
Thu 11/1911:35 am -
2 stops42h 21m
Deal found 10/16![Scandinavian Airlines logo]()
$845
This FlightHub deal was found by Cheapflights users on 10/17. 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.
Wed 11/113:40 pm -
1 stop16h 45m
Tue 11/173:20 pm -
1 stop28h 25m
Deal found 10/17![Lufthansa logo]()
$850
This Kiwi.com deal was found by Cheapflights users on 10/15. 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 11/147:59 pm -
1 stop28h 06m
Sat 11/214:55 pm -
2 stops20h 59m
Deal found 10/15![Multiple Airlines logo]()
$789
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.
Mon 11/165:00 pm -
2 stops59h 00m
Mon 11/2312:00 pm -
1 stop15h 40m
Deal found 10/19![United Airlines logo]()
$853
This Finnair deal was found by Cheapflights users on 10/16. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/3010:21 am -
2 stops24h 54m
Mon 12/710:00 am -
2 stops40h 27m
Deal found 10/16![Multiple Airlines logo]()
$821
One-way flights from St. Louis to Keflavik IntlSearch for one-way flight options from St. Louis to Keflavik Intl. Find affordable one-way fares based on user searches. Data last updated October 20, 2026.
Search for one-way flight options from St. Louis to Keflavik Intl. Find affordable one-way fares based on user searches. Data last updated October 20, 2026.
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:14 pm -
2 stops36h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Multiple Airlines logo]()
$593
Find flight deals from St. Louis to Keflavik Intl
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) 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 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $754 (Expedia) |
One-way from | $593 (Kiwi.com) |
Good round-trip deal | $472 or less |
Good one-way deal | $458 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis 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 20, 2026.
Use the filters below to find and compare flights from St. Louis to Reykjavik Keflavik Intl Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisReykjavik
STL Lambert-St Louis - KEF Reykjavik Keflavik Intl
STLKEF
Lambert-St Louis
Thu 11/12
12:14 pm-6:30 am
3 stops36h 16m
Reykjavik Keflavik Intl
Wed 12/31
12:00 am-6:00 pm
Nonstop0h 00m
$652
St. LouisReykjavik
STL Lambert-St Louis - KEF Reykjavik Keflavik Intl
STLKEF
Lambert-St Louis
Sun 3/28
3:40 pm-9:30 am
2 stops36h 50m
Reykjavik Keflavik Intl
Wed 3/31
11:25 am-11:39 pm
2 stops17h 14m
$772
St. LouisReykjavik
STL Lambert-St Louis - KEF Reykjavik Keflavik Intl
STLKEF
Lambert-St Louis
Mon 2/22
10:20 am-5:15 pm
2 stops24h 55m
Reykjavik Keflavik Intl
Mon 3/1
6:00 pm-11:10 pm
2 stops35h 10m
$782
St. LouisReykjavik
STL Lambert-St Louis - KEF Reykjavik Keflavik Intl
STLKEF
Lambert-St Louis
Thu 12/3
3:00 pm-10:00 am
2 stops37h 00m
Reykjavik Keflavik Intl
Thu 12/10
12:00 pm-4:24 pm
1 stop10h 24m
$828
St. LouisReykjavik
STL Lambert-St Louis - KEF Reykjavik Keflavik Intl
STLKEF
Lambert-St Louis
Thu 11/12
8:00 am-10:00 am
2 stops44h 00m
Reykjavik Keflavik Intl
Thu 11/19
3:20 pm-1:45 pm
1 stop28h 25m
$861
Quickest round-trip
St. LouisReykjavik
STL Lambert-St Louis - KEF Reykjavik Keflavik Intl
STLKEF
Lambert-St Louis
Wed 3/3
1:55 pm-6:30 am
1 stop10h 35m
Reykjavik Keflavik Intl
Sun 3/7
5:00 pm-11:55 pm
1 stop12h 55m
$869
St. LouisReykjavik
STL Lambert-St Louis - KEF Reykjavik Keflavik Intl
STLKEF
Lambert-St Louis
Sun 1/24
1:55 pm-6:30 am
1 stop10h 35m
Reykjavik Keflavik Intl
Sat 1/30
5:00 pm-2:55 pm
1 stop27h 55m
$879
St. LouisReykjavik
STL Lambert-St Louis - KEF Reykjavik Keflavik Intl
STLKEF
Lambert-St Louis
Sun 1/31
1:45 pm-6:30 am
1 stop10h 45m
Reykjavik Keflavik Intl
Sat 2/6
5:00 pm-2:55 pm
1 stop27h 55m
$879
Sorted by cheapest first
Compare providers for flights from St. Louis 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 St. Louis 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 |
- Most accurate provider: When it comes to deals on St. Louis-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 St. Louis-Reykjavik Keflavik Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Reykjavik Keflavik Intl Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-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 St. Louis-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 St. Louis to Keflavik Intl
Have a flexible travel schedule? Discover the best time to fly to Keflavik Intl from St. Louis with our price prediction graph.
STL-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.
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 20, 2026.
See what other customers who have flown with Delta and United Airlines from St. Louis to Reykjavik Keflavik Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Crew
8.5
Overall
7.8
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
6.0
GoodEllen,Oct 2026
GRR - ATL
Boarding
8.1
Crew
8.5
Overall
7.8
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
6.0
GoodEllen,Oct 2026
GRR - ATL
Boarding
8.1
Crew
8.5
Overall
7.8
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
6.0
GoodEllen,Oct 2026
GRR - ATL
Related info for your journey
Find useful and relevant information for your journey from St. Louis 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
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
Keflavik Intl flight routes
Other flight options
Other flights from St. Louis
Popular flights
Alternative routes for St. Louis to Keflavik Intl
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Keflavik Intl by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Keflavik Intl by cabin class
Find flights from St. Louis to Keflavik Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Keflavik Intl
Explore flights to Keflavik Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 20, 2026.
St. Louis and Keflavik Intl flights
Browse other St. Louis and Keflavik Intl flight options. Last updated on October 20, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on October 20, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 2 airlines flying from St. Louis to Keflavik Intl
Discover the top 2 airlines that operate flights from St. Louis 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 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$783 | Average$1,131 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$784 | Average$1,164 | FlexibilityNo cancel fee | On-timeN/A |