$584+ Cheap flights from St. Louis (STL) to Keflavik Intl (KEF)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — KEF
May 9 — May 161
Round-trip
1 adult, Economy
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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 April 9, 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 April 9, 2026.
This KLM deal was found by Cheapflights users on 4/4. 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 8/164:13 pm
STL
- KEF
1 stop12h 17m
KLM
Wed 8/268:45 am
KEF
- STL
1 stop13h 04m
KLM
Deal found 4/4![KLM logo]()
$775
This KLM deal was found by Cheapflights users on 4/5. 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.
Tue 5/511:42 am
STL
- KEF
2 stops16h 48m
KLM
Tue 5/128:45 am
KEF
- STL
1 stop17h 24m
KLM
Deal found 4/5![KLM logo]()
$779
This KLM deal was found by Cheapflights users on 4/6. 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 8/154:13 pm
STL
- KEF
1 stop12h 32m
KLM
Wed 8/268:45 am
KEF
- STL
1 stop13h 04m
KLM
Deal found 4/6![KLM logo]()
$825
This KAYAK deal was found by Cheapflights users on 4/6. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/51:02 pm
STL
- KEF
2 stops15h 28m
Scandinavian Airlines
Wed 5/1311:25 am
KEF
- STL
1 stop10h 40m
Scandinavian Airlines
Deal found 4/6![Scandinavian Airlines logo]()
$828
This KLM deal was found by Cheapflights users on 4/5. 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.
Mon 5/49:59 am
STL
- KEF
2 stops18h 31m
Multiple Airlines
Mon 5/1111:25 am
KEF
- STL
2 stops14h 44m
Multiple Airlines
Deal found 4/5![Multiple Airlines logo]()
$829
This Kiwi.com deal was found by Cheapflights users on 4/4. 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 6/138:08 pm
STL
- KEF
1 stop28h 52m
Multiple Airlines
Tue 6/2310:45 am
KEF
- STL
1 stop13h 38m
Multiple Airlines
Deal found 4/4![Multiple Airlines logo]()
$830
This KLM deal was found by Cheapflights users on 4/6. 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.
Tue 5/1211:25 am
STL
- KEF
1 stop15h 15m
KLM
Wed 5/209:30 am
KEF
- STL
1 stop12h 16m
KLM
Deal found 4/6![KLM logo]()
$855
This KLM deal was found by Cheapflights users on 4/6. 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.
Tue 5/121:27 pm
STL
- KEF
2 stops12h 33m
Multiple Airlines
Wed 5/2011:25 am
KEF
- STL
2 stops14h 44m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$859
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 April 9, 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 April 9, 2026.
This KLM deal was found by Cheapflights users on 4/4. 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.
Tue 5/121:27 pm
STL
- KEF
2 stops12h 33m
KLM
Wed 5/209:30 am
KEF
- STL
1 stop12h 16m
KLM
Deal found 4/4![KLM logo]()
$859
This United Airlines deal was found by Cheapflights users on 4/4. 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 9/11:18 pm
STL
- KEF
1 stop14h 32m
United Airlines
Wed 9/309:15 am
KEF
- STL
1 stop14h 26m
United Airlines
Deal found 4/4![United Airlines logo]()
$947
This KLM deal was found by Cheapflights users on 4/5. 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.
Thu 5/141:27 pm
STL
- KEF
2 stops12h 33m
Multiple Airlines
Thu 5/2111:25 am
KEF
- STL
1 stop10h 40m
Multiple Airlines
Deal found 4/5![Multiple Airlines logo]()
$998
This United Airlines deal was found by Cheapflights users on 4/8. 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 8/156:55 pm
STL
- KEF
2 stops32h 00m
United Airlines
Wed 8/2610:00 am
KEF
- STL
2 stops31h 49m
United Airlines
Deal found 4/8![United Airlines logo]()
$962
This KLM deal was found by Cheapflights users on 4/4. 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 7/410:20 am
STL
- KEF
1 stop16h 20m
Multiple Airlines
Thu 7/1611:25 am
KEF
- STL
1 stop10h 33m
Multiple Airlines
Deal found 4/4![Multiple Airlines logo]()
$1,094
This United Airlines deal was found by Cheapflights users on 4/4. 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 7/45:46 pm
STL
- KEF
2 stops33h 09m
United Airlines
Thu 7/169:15 am
KEF
- STL
1 stop14h 27m
United Airlines
Deal found 4/4![United Airlines logo]()
$1,055
This United Airlines deal was found by Cheapflights users on 4/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/306:49 pm
STL
- KEF
1 stop9h 01m
United Airlines
Tue 10/610:00 am
KEF
- STL
2 stops41h 06m
United Airlines
Deal found 4/6![United Airlines logo]()
$1,055
Last-minute flights from St. Louis to Keflavik IntlDiscover last-minute flight deals from St. Louis to Keflavik Intl. Data last updated April 9, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Keflavik Intl. Data last updated April 9, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/6. 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.
Thu 4/307:00 am
STL
- KEF
1 stop21h 25m
Multiple Airlines
Mon 5/47:45 pm
KEF
- STL
1 stop25h 05m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$934
This KAYAK deal was found by Cheapflights users on 4/5. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/211:42 am
STL
- KEF
2 stops23h 33m
Scandinavian Airlines
Wed 5/65:35 pm
KEF
- STL
2 stops35h 24m
Scandinavian Airlines
Deal found 4/5![Scandinavian Airlines logo]()
$982
This KLM deal was found by Cheapflights users on 4/5. 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.
Mon 5/49:59 am
STL
- KEF
2 stops18h 31m
Multiple Airlines
Mon 5/1111:25 am
KEF
- STL
2 stops14h 44m
Multiple Airlines
Deal found 4/5![Multiple Airlines logo]()
$829
This KLM deal was found by Cheapflights users on 4/5. 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.
Tue 5/511:42 am
STL
- KEF
2 stops16h 48m
KLM
Tue 5/128:45 am
KEF
- STL
1 stop17h 24m
KLM
Deal found 4/5![KLM logo]()
$779
This KAYAK deal was found by Cheapflights users on 4/6. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/51:02 pm
STL
- KEF
2 stops15h 28m
Scandinavian Airlines
Wed 5/1311:25 am
KEF
- STL
1 stop10h 40m
Scandinavian Airlines
Deal found 4/6![Scandinavian Airlines logo]()
$828
This KAYAK deal was found by Cheapflights users on 4/6. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/511:42 am
STL
- KEF
2 stops24h 03m
Scandinavian Airlines
Fri 5/155:45 pm
KEF
- STL
2 stops32h 44m
Scandinavian Airlines
Deal found 4/6![Scandinavian Airlines logo]()
$952
This KLM deal was found by Cheapflights users on 4/6. 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.
Wed 5/69:59 am
STL
- KEF
2 stops18h 31m
KLM
Wed 5/138:45 am
KEF
- STL
2 stops14h 01m
KLM
Deal found 4/6![KLM logo]()
$979
This Delta deal was found by Cheapflights users on 4/6. 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.
Thu 5/75:36 pm
STL
- KEF
1 stop9h 04m
Delta
Fri 5/159:30 am
KEF
- STL
1 stop10h 01m
Delta
Deal found 4/6![Delta logo]()
$955
This KLM deal was found by Cheapflights users on 4/6. 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.
Tue 5/1211:25 am
STL
- KEF
1 stop15h 15m
KLM
Wed 5/209:30 am
KEF
- STL
1 stop12h 16m
KLM
Deal found 4/6![KLM logo]()
$855
This KLM deal was found by Cheapflights users on 4/6. 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.
Tue 5/121:27 pm
STL
- KEF
2 stops12h 33m
Multiple Airlines
Wed 5/2011:25 am
KEF
- STL
2 stops14h 44m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$859
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 April 9, 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 April 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/5. 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.
Mon 7/138:08 pm
STL
- KEF
3 stops30h 32m
Multiple Airlines
Deal found 4/5![Multiple Airlines logo]()
$584
This United Airlines deal was found by Cheapflights users on 4/5. 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.
Mon 7/1312:10 pm
STL
- KEF
1 stop14h 45m
United Airlines
Deal found 4/5![United Airlines logo]()
$629
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 April 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $775 (KLM) |
One-way from | $584 (Kiwi.com) |
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 2,558,603 searches. Data last updated April 9, 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 - KEF
STLKEF
Lambert-St Louis
Tue 5/12
1:27 pm-7:00 am
2 stops12h 33m
Reykjavik Keflavik Intl
Wed 5/20
9:30 am-4:46 pm
1 stop12h 16m
$859
St. LouisReykjavik
STL - KEF
STLKEF
Lambert-St Louis
Tue 9/1
1:18 pm-8:50 am
1 stop14h 32m
Reykjavik Keflavik Intl
Wed 9/30
9:15 am-6:41 pm
1 stop14h 26m
$947
St. LouisReykjavik
STL - KEF
STLKEF
Lambert-St Louis
Sat 8/15
6:55 pm-7:55 am
2 stops32h 00m
Reykjavik Keflavik Intl
Wed 8/26
10:00 am-12:49 pm
2 stops31h 49m
$962
Quickest round-trip
St. LouisReykjavik
STL - KEF
STLKEF
Lambert-St Louis
Thu 5/14
1:27 pm-7:00 am
2 stops12h 33m
Reykjavik Keflavik Intl
Thu 5/21
11:25 am-5:05 pm
1 stop10h 40m
$998
St. LouisReykjavik
STL - KEF
STLKEF
Lambert-St Louis
Sat 7/4
5:46 pm-7:55 am
2 stops33h 09m
Reykjavik Keflavik Intl
Thu 7/16
9:15 am-6:42 pm
1 stop14h 27m
$1,055
St. LouisReykjavik
STL - KEF
STLKEF
Lambert-St Louis
Wed 9/30
6:49 pm-8:50 am
1 stop9h 01m
Reykjavik Keflavik Intl
Tue 10/6
10:00 am-10:06 pm
2 stops41h 06m
$1,055
St. LouisReykjavik
STL - KEF
STLKEF
Lambert-St Louis
Sat 7/4
10:20 am-7:40 am
1 stop16h 20m
Reykjavik Keflavik Intl
Thu 7/16
11:25 am-4:58 pm
1 stop10h 33m
$1,094
Cheapest one-way
St. LouisReykjavik
STL - KEF
STLKEF
Lambert-St Louis
Mon 7/13
8:08 pm-7:40 am
3 stops30h 32m
$584
Quickest one-way
St. LouisReykjavik
STL - KEF
STLKEF
Lambert-St Louis
Mon 7/13
12:10 pm-7:55 am
1 stop14h 45m
$629
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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 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 April 9, 2026.
See what other customers who have flown with Delta,KLM, andUnited 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.
Food
7.2
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - 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 locationsKeflavik
Hveragerdi
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St. Louis and Keflavik Intl flights
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Top 4 airlines flying from St. Louis to Keflavik Intl
Discover the top 4 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 2,558,603 searches. Data last updated April 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$592 | Average$1,074 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$604 | Average$870 | FlexibilityNo cancel fee | On-time67% | |
| Cheapest$636 | Average$997 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$756 | Average$1,080 | FlexibilityNo cancel fee | On-time75% |