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Keflavik Intl

$503+ 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 7/23. Fares are subject to change and may not be available on all flights or dates of travel.
STL — KEF
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$651
(Expedia)

Popular in

November

Cheapest in

December

Average price

$983
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.
Search Deals
From Lambert-St Louis to Reykjavik Keflavik Intl
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($24 potential savings vs. average RT price).
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Average for round-trip flights in February 2025
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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 February 20, 2025.

This Booking.com deal was found by Cheapflights users on 2/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/229:15 amSTL - KEF
2 stops41h 55mAir Canada
Thu 7/319:30 amKEF - STL
2 stops34h 46mAir Canada
Deal found 2/20$599
This Expedia deal was found by Cheapflights users on 2/19. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/1111:55 amSTL - KEF
2 stops41h 50mBritish Airways
Tue 3/1811:45 amKEF - STL
2 stops39h 33mBritish Airways
Deal found 2/19$651
This United Airlines deal was found by Cheapflights users on 2/20. 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 3/306:30 amSTL - KEF
2 stops36h 05mMultiple Airlines
Sat 4/512:25 amKEF - STL
2 stops20h 22mMultiple Airlines
Deal found 2/20$717
This United deal was found by Cheapflights users on 2/20. 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.
Sun 8/245:18 pmSTL - KEF
1 stop10h 12mUnited Airlines
Mon 9/112:00 pmKEF - STL
1 stop31h 18mUnited Airlines
Deal found 2/20$737
This Lufthansa deal was found by Cheapflights users on 2/19. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/33:45 pmSTL - KEF
2 stops16h 30mLufthansa
Thu 12/113:10 pmKEF - STL
2 stops28h 45mLufthansa
Deal found 2/19$802
This Delta deal was found by Cheapflights users on 2/20. 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 9/1411:51 amSTL - KEF
2 stops16h 39mDelta
Sun 9/2811:25 amKEF - STL
2 stops14h 05mDelta
Deal found 2/20$851
This KLM deal was found by Cheapflights users on 2/19. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/121:00 pmSTL - KEF
2 stops15h 30mKLM
Tue 5/208:50 amKEF - STL
1 stop13h 00mKLM
Deal found 2/19$933
This KAYAK deal was found by Cheapflights users on 2/20. 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 9/612:24 pmSTL - KEF
2 stops29h 56mAustrian Airlines
Fri 9/1912:10 amKEF - STL
2 stops26h 00mAustrian Airlines
Deal found 2/20$1,003
This StudentUniverse deal was found by Cheapflights users on 2/19. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/911:06 amSTL - KEF
2 stops39h 54mFinnair
Sun 4/135:15 pmKEF - STL
2 stops33h 57mFinnair
Deal found 2/19$1,004

Find flights from St. Louis to Keflavik Intl within your budget

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 February 20, 2025.

Fly from

St. Louis

Fly to

Keflavik Intl

Route

Depart

Return

Price

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 7/22

9:15 am-8:10 am

2 stops41h 55m

Reykjavik Keflavik Intl

Thu 7/31

9:30 am-3:16 pm

2 stops34h 46m

$599

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 3/11

11:55 am-10:45 am

2 stops41h 50m

Reykjavik Keflavik Intl

Tue 3/18

11:45 am-10:18 pm

2 stops39h 33m

$651

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sun 3/30

6:30 am-11:35 pm

2 stops36h 05m

Reykjavik Keflavik Intl

Sat 4/5

12:25 am-3:47 pm

2 stops20h 22m

$717

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Wed 7/30

9:50 am-8:35 am

2 stops17h 45m

Reykjavik Keflavik Intl

Tue 8/5

12:00 pm-10:45 pm

1 stop15h 45m

$737

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sun 3/30

3:30 pm-11:35 pm

1 stop27h 05m

Reykjavik Keflavik Intl

Sat 4/5

12:25 am-3:47 pm

2 stops44h 22m

$892

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Mon 5/12

1:00 pm-9:30 am

2 stops15h 30m

Reykjavik Keflavik Intl

Tue 5/20

8:50 am-4:50 pm

1 stop13h 00m

$933

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Wed 7/30

12:00 pm-9:30 am

1 stop16h 30m

Reykjavik Keflavik Intl

Thu 8/7

11:25 am-8:41 am

1 stop26h 16m

$982

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Wed 4/9

11:06 am-8:00 am

2 stops39h 54m

Reykjavik Keflavik Intl

Sun 4/13

5:15 pm-10:12 pm

2 stops33h 57m

$1,004

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Thu 5/22

1:10 pm-8:30 am

1 stop14h 20m

Reykjavik Keflavik Intl

Sun 5/25

12:10 am-9:25 pm

2 stops26h 15m

$1,240

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Fri 3/21

4:45 pm-11:20 pm

2 stops25h 35m

Reykjavik Keflavik Intl

Fri 3/28

7:35 am-11:31 pm

2 stops20h 56m

$1,265

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 13 results
1
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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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*1 star

*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.

Travel insights for flights from St. Louis to Keflavik Intl

Get recent, data-driven insights about flights from St. Louis to Keflavik Intl including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from St. Louis to Reykjavik Keflavik Intl Airport?

Currently, November is the cheapest month in which you can book a flight from St. Louis to Reykjavik Keflavik Intl Airport (average of $328). Flying from St. Louis to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $657). 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 STL to KEF?

Find hourly flight availability from St. Louis 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 February 20, 2025.

When flying from St. Louis to Reykjavik Keflavik Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 19% versus a flight in the afternoon.

Rainfall in Keflavik Intl by month

Plan your trip to Keflavik Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Reykjavik Keflavik Intl Airport ranges from 1.6 - 3.1 inches per month. January is typically the wettest month, when rainfall can reach 3.1 in. May is typically the driest time to visit Reykjavik Keflavik Intl Airport when rainfall is around 1.6 in.

Temperature in Keflavik Intl by month

Plan your trip to Keflavik Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Reykjavik Keflavik Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 51.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 February 20, 2025.
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Alaska Airlines
8.0
Very good
9,697 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

KLM
7.8
Good
1,333 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Finnair
7.6
Good
1,274 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

United Airlines
7.4
Good
8,765 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Scandinavian Airlines
7.3
Good
1,325 reviews
Alaska Airlines
8.0
Very good
9,697 reviews

Comfort

7.9

Entertainment

7.1

Food

7.1

Overall

8.0

Crew

8.5

Boarding

8.2

Reviews

1 / 20

10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.

  • 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 British Airways. Our recent data shows that you can find tickets from as low as $651 on this airline. Additional options worth looking into are Lufthansa and KLM, starting at $892 and $933 round-trip. British Airways is 29% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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.

  • What is the cheapest month to book a flight from St. Louis to Reykjavik Keflavik Intl Airport?

    Currently, November is the cheapest month in which you can book a flight from St. Louis to Reykjavik Keflavik Intl Airport (average of $328). Flying from St. Louis to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $657). 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.

See more FAQs

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Alternative routes for St. Louis to Keflavik Intl

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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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$568Average$786FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$626Average$1,028FlexibilityNo cancel feeOn-time69%
DeltaCheapest$666Average$872FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$675Average$1,157FlexibilityNo cancel feeOn-time75%
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