Keflavik Intl

$525+ 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 7/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — KEF
Jul 8 — Jul 151
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Find cheap flights from St. Louis to Keflavik Intl with Cheapflights

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Cheap flight deals from St. Louis to Keflavik Intl

Cheapest flights from St. Louis to Keflavik Intl
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 June 8, 2026.

This KLM deal was found by Cheapflights users on 6/3. 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 8/153:29 pm
STL
-
KEF
1 stop10h 31m
Multiple Airlines
Wed 8/269:30 am
KEF
-
STL
1 stop18h 56m
Multiple Airlines
Deal found 6/3$825
This Delta deal was found by Cheapflights users on 6/3. 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 8/153:44 pm
STL
-
KEF
2 stops12h 46m
Delta
Wed 8/2611:25 am
KEF
-
STL
2 stops16h 56m
Delta
Deal found 6/3$830
This Delta deal was found by Cheapflights users on 6/3. 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 8/1311:13 am
STL
-
KEF
1 stop14h 47m
Delta
Sat 8/228:45 am
KEF
-
STL
1 stop16h 57m
Delta
Deal found 6/3$875
This KLM deal was found by Cheapflights users on 6/3. 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 8/1311:13 am
STL
-
KEF
1 stop14h 47m
KLM
Sat 8/228:45 am
KEF
-
STL
2 stops12h 32m
KLM
Deal found 6/3$880
This Orbitz deal was found by Cheapflights users on 6/6. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1912:10 pm
STL
-
KEF
1 stop14h 45m
Air Canada
Wed 9/210:00 am
KEF
-
STL
1 stop15h 07m
Air Canada
Deal found 6/6$911
This Air Canada deal was found by Cheapflights users on 6/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1612:10 pm
STL
-
KEF
1 stop14h 45m
Air Canada
Tue 9/19:15 am
KEF
-
STL
2 stops31h 47m
Air Canada
Deal found 6/6$913
This Air Canada deal was found by Cheapflights users on 6/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/182:40 pm
STL
-
KEF
1 stop13h 05m
Air Canada
Tue 9/19:15 am
KEF
-
STL
2 stops31h 47m
Air Canada
Deal found 6/6$918
This Air Canada deal was found by Cheapflights users on 6/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/169:30 am
STL
-
KEF
2 stops17h 25m
Air Canada
Wed 9/210:00 am
KEF
-
STL
2 stops34h 38m
Air Canada
Deal found 6/6$922
This Air Canada deal was found by Cheapflights users on 6/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/1612:10 pm
STL
-
KEF
1 stop14h 45m
Air Canada
Thu 9/39:15 am
KEF
-
STL
1 stop14h 27m
Air Canada
Deal found 6/6$926
This United Airlines deal was found by Cheapflights users on 6/6. 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.
Tue 8/1812:27 pm
STL
-
KEF
1 stop13h 33m
United Airlines
Tue 9/19:15 am
KEF
-
STL
1 stop14h 27m
United Airlines
Deal found 6/6$927
This Air Canada deal was found by Cheapflights users on 6/6. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:54 pm
STL
-
KEF
2 stops32h 01m
Air Canada
Fri 9/49:15 am
KEF
-
STL
1 stop14h 27m
Air Canada
Deal found 6/6$931

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 June 8, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$825
(KLM)

One-way from

$525
(KLM)
Provider with most accurate pricing for Lambert-St Louis-Reykjavik Keflavik Intl flight deals.
Provider most trusted by Cheapflights users for Lambert-St Louis-Reykjavik Keflavik Intl flights.
From Lambert-St Louis to Reykjavik Keflavik Intl
One-way flight from Lambert-St Louis to Reykjavik Keflavik Intl

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 June 8, 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

Price

Cheapest round-trip
Quickest round-trip

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 8/15

3:44 pm-9:30 am

2 stops12h 46m

Reykjavik Keflavik Intl

Wed 8/26

11:25 am-11:21 pm

2 stops16h 56m

$830

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Wed 10/7

1:09 pm-8:50 am

2 stops14h 41m

Reykjavik Keflavik Intl

Wed 10/14

9:15 am-2:17 pm

2 stops34h 02m

$955

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 10/6

5:10 am-7:55 am

2 stops21h 45m

Reykjavik Keflavik Intl

Tue 10/13

10:00 am-12:13 pm

2 stops31h 13m

$959

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Mon 9/21

12:59 pm-8:50 am

1 stop14h 51m

Reykjavik Keflavik Intl

Wed 9/30

9:15 am-3:43 pm

2 stops35h 28m

$964

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sun 9/20

8:50 am-8:50 am

1 stop19h 00m

Reykjavik Keflavik Intl

Wed 9/30

9:15 am-2:11 pm

2 stops33h 56m

$964

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 7/18

4:53 pm-7:55 am

2 stops34h 02m

Reykjavik Keflavik Intl

Tue 7/28

9:15 am-12:11 pm

2 stops31h 56m

$977
Cheapest one-way

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Fri 7/24

3:58 pm-9:30 am

2 stops12h 32m

$525
Quickest one-way

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Fri 7/24

3:57 pm-7:00 am

1 stop10h 03m

$525

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Fri 7/24

12:10 pm-7:55 am

1 stop14h 45m

$534

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 8/22

6:08 pm-7:40 am

3 stops32h 32m

$1,064

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/4

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

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 June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • 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.
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 June 8, 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.

Entertainment

7.8

Comfort

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Entertainment

7.8

Comfort

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Entertainment

7.8

Comfort

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Entertainment

7.8

Comfort

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

Entertainment

7.8

Comfort

7.8

Crew

8.5

Overall

7.9

Boarding

8.1

Food

7.2

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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.
  • What airport do you fly from for flights from St. Louis to Reykjavik Keflavik Intl?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Reykjavik Keflavik Intl from St. Louis. Booking flights from Lambert-St Louis (STL) to Reykjavik Keflavik Intl should be relatively easy as there are 0 daily outbound flights to Reykjavik Keflavik Intl from 4 different airlines.

  • How long is the flight from St. Louis to Reykjavik Keflavik Intl Airport?

    Departing from St. Louis to Reykjavik Keflavik Intl Airport will take you 12h 46m. The distance from St. Louis to Reykjavik Keflavik Intl Airport is about 3191 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines flying from St. Louis to Reykjavik Keflavik Intl Airport round-trip?

    Our cheapest airline available from St. Louis to Reykjavik Keflavik Intl Airport is United Airlines. Our recent data shows that you can find tickets from as low as $595 on this airline. Additional options worth looking into are Air Canada and KLM, starting at $604 and $756 round-trip.

  • Can I find deals for flights from St. Louis to Keflavik Intl that include hotel bookings?

    Yes. In addition to deals on St. Louis to Keflavik Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Keflavik Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Keflavik Intl.

  • Can I find deals for business class flights from St. Louis to Keflavik Intl?

    Yes. Cheapflights offers flight deals from St. Louis to Keflavik Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near Reykjavik Keflavik Intl Airport?

Book flights to Reykjavik Keflavik Intl Airport if you plan to visit one of these locations
Keflavik
Hveragerdi

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Alternative routes for St. Louis to Keflavik Intl

See prices for flight routes from nearby airports that may be better suited for you.

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 June 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$595Average$1,086FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$604Average$870FlexibilityNo cancel feeOn-time67%
KLMCheapest$756Average$1,080FlexibilityNo cancel feeOn-time75%
DeltaCheapest$784Average$1,080FlexibilityNo cancel feeOn-timeN/A

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