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Keflavik Intl

$416+ 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 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — KEF
feb. 7 — feb. 141
sáb. 2/7
sáb. 2/14
1 adult, Economy
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Cheap 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 enero 8, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$506
(Finnair)

One-way from

$416
(Kiwi.com)

Popular in

March

Cheapest in

February

Average price

$701
Provider with most accurate pricing for Lambert-St Louis-Reykjavik Keflavik Intl flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Reykjavik Keflavik Intl flights.
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From Lambert-St Louis to Reykjavik Keflavik Intl
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One-way flight from Lambert-St Louis to Reykjavik Keflavik Intl
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Highest demand for flights based on searches. 6% potential increase in price ($73 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($35 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find 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 enero 8, 2026.

This Finnair deal was found by Cheapflights users on 1/6. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/712:27 pmSTL - KEF
2 stops23h 03mMultiple Airlines
lun. 4/138:35 amKEF - STL
2 stops39h 55mMultiple Airlines
Deal found 1/6$506
This KLM deal was found by Cheapflights users on 1/6. 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.
sáb. 4/1110:07 amSTL - KEF
2 stops18h 23mKLM
sáb. 4/1811:25 amKEF - STL
2 stops17h 08mKLM
Deal found 1/6$594
This Gotogate deal was found by Cheapflights users on 1/8. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/16:49 pmSTL - KEF
2 stops32h 56mAir Canada
mié. 9/169:15 amKEF - STL
2 stops34h 03mAir Canada
Deal found 1/8$727
This Kiwi.com deal was found by Cheapflights users on 1/6. 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.
sáb. 4/187:00 amSTL - KEF
1 stop18h 15mMultiple Airlines
sáb. 4/257:45 pmKEF - STL
1 stop25h 05mMultiple Airlines
Deal found 1/6$729
This KLM deal was found by Cheapflights users on 1/8. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/12:18 pmSTL - KEF
1 stop11h 02mKLM
mié. 9/1611:25 amKEF - STL
1 stop10h 15mKLM
Deal found 1/8$733
This Kiwi.com deal was found by Cheapflights users on 1/7. 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.
vie. 2/277:00 amSTL - KEF
1 stop17h 15mMultiple Airlines
mié. 3/45:00 pmKEF - STL
1 stop26h 51mMultiple Airlines
Deal found 1/7$736
This United Airlines deal was found by Cheapflights users on 1/7. 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.
mar. 9/221:30 pmSTL - KEF
1 stop13h 25mUnited Airlines
mar. 9/2910:00 amKEF - STL
2 stops41h 06mUnited Airlines
Deal found 1/7$747
This Air Canada deal was found by Cheapflights users on 1/6. 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.
mié. 9/231:30 pmSTL - KEF
2 stops14h 15mAir Canada
mié. 9/309:15 amKEF - STL
2 stops34h 03mAir Canada
Deal found 1/6$751
This Mytrip deal was found by Cheapflights users on 1/6. 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.
dom. 8/165:00 amSTL - KEF
2 stops21h 55mAir Canada
dom. 8/2310:00 amKEF - STL
2 stops37h 27mAir Canada
Deal found 1/6$754

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 enero 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

St. Louis

Fly to

Keflavik Intl

Route

Depart

Return

Price

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

mar. 4/7

12:27 pm-4:30 pm

2 stops23h 03m

Reykjavik Keflavik Intl

lun. 4/13

8:35 am-7:30 pm

2 stops39h 55m

$506

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

sáb. 4/11

10:07 am-9:30 am

2 stops18h 23m

Reykjavik Keflavik Intl

sáb. 4/18

11:25 am-11:33 pm

2 stops17h 08m

$594

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

mié. 4/1

12:04 pm-9:30 am

2 stops16h 26m

Reykjavik Keflavik Intl

jue. 4/9

11:25 am-8:42 pm

2 stops14h 17m

$793

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

dom. 5/10

6:00 pm-8:30 am

2 stops57h 30m

Reykjavik Keflavik Intl

dom. 5/17

12:00 pm-8:54 pm

2 stops37h 54m

$835

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

vie. 2/27

3:47 pm-10:45 am

2 stops36h 58m

Reykjavik Keflavik Intl

mié. 3/4

11:30 am-11:36 pm

2 stops42h 06m

$843

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

jue. 4/23

1:11 pm-11:50 pm

2 stops29h 39m

Reykjavik Keflavik Intl

lun. 4/27

5:05 pm-9:17 pm

2 stops33h 12m

$847

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

lun. 5/18

5:30 pm-7:00 am

1 stop8h 30m

Reykjavik Keflavik Intl

dom. 5/24

8:50 am-4:49 pm

1 stop12h 59m

$879

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

vie. 6/12

2:20 pm-8:45 am

1 stop13h 25m

Reykjavik Keflavik Intl

vie. 6/19

9:15 am-8:05 pm

1 stop15h 50m

$916

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

lun. 4/13

10:44 pm-8:00 am

3 stops52h 16m

$416

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

lun. 4/13

11:43 am-9:30 am

2 stops16h 47m

$475

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 12 results
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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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
AranGrantPrice Accuracy2 starsTrust Score*3 stars
eDreamsPrice 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on St. Louis-Reykjavik Keflavik Intl Airport flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 enero 8, 2026.
See what other customers who have flown with Delta, KLM, 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.
Delta
7.9
Good
8,031 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,031 reviews
Delta
7.9
Good
8,031 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
KLM
7.7
Good
1,434 reviews
Delta
7.9
Good
8,031 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,142 reviews
Delta
7.9
Good
8,031 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Air Canada
7.1
Good
10,603 reviews
Delta
7.9
Good
8,031 reviews

Entertainment

7.8

Food

7.2

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 16h 26m. 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 Air Canada. Our recent data shows that you can find tickets from as low as $566 on this airline. Additional options worth looking into are United Airlines and Delta, starting at $595 and $636 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.
Kansas City to Keflavik Intl flights
Springfield to Keflavik Intl flights

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 enero 8, 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$566Average$763FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$595Average$1,106FlexibilityNo cancel feeOn-time69%
DeltaCheapest$636Average$1,036FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$828Average$1,147FlexibilityNo cancel feeOn-time75%

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