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$452+ Cheap flights from Keflavik Intl (KEF) to St. Louis (STL)

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 8/13. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — STL
May 5 — May 121
Mon 5/5
Mon 5/12
1 adult, Economy
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Cheap flight deals from Keflavik Intl to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Keflavik Intl (KEF) to St. Louis (STL). 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 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
2 stars

Round-trip from

$744
(United Airlines)

One-way from

$452
(Cheapflightsfares)
Provider with most accurate pricing for Reykjavik Keflavik Intl-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Reykjavik Keflavik Intl-Lambert-St Louis flights.
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From Reykjavik Keflavik Intl to Lambert-St Louis
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One-way flight from Reykjavik Keflavik Intl to Lambert-St Louis
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Find flight deals from Keflavik Intl to St. Louis

Cheapest flights from Keflavik Intl to St. Louis
Explore the most affordable flight options available from Keflavik Intl to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 30, 2025.

This United Airlines deal was found by Cheapflights users on 4/29. 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.
Fri 6/1312:00 pmKEF - STL
2 stops39h 27mUnited Airlines
Fri 6/208:25 amSTL - KEF
2 stops19h 05mUnited Airlines
Deal found 4/29$744
This Delta deal was found by Cheapflights users on 4/29. 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 5/1511:25 amKEF - STL
1 stop14h 23mDelta
Mon 5/196:00 amSTL - KEF
1 stop22h 30mDelta
Deal found 4/29$779
This Expedia deal was found by Cheapflights users on 4/29. 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.
Thu 5/1511:25 amKEF - STL
2 stops34h 10mKLM
Mon 5/197:06 pmSTL - KEF
2 stops30h 14mKLM
Deal found 4/29$787
This Air France deal was found by Cheapflights users on 4/29. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/149:30 amKEF - STL
1 stop18h 52mAir France
Sat 6/213:42 pmSTL - KEF
2 stops12h 48mAir France
Deal found 4/29$806
This KLM deal was found by Cheapflights users on 4/29. 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 5/1511:25 amKEF - STL
2 stops17h 13mMultiple Airlines
Mon 5/193:40 pmSTL - KEF
2 stops12h 50mMultiple Airlines
Deal found 4/29$905
This Gurufare deal was found by Cheapflights users on 4/29. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/1312:25 amKEF - STL
2 stops27h 20mLufthansa
Sat 6/211:10 pmSTL - KEF
2 stops29h 25mLufthansa
Deal found 4/29$1,010

Cheapflights Fare Finder

Customize your flight search to find flights from Keflavik Intl to St. Louis 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 30, 2025.
Use the filters below to find and compare flights from Reykjavik Keflavik Intl Airport to St. Louis that are best for you.

Fly from

Keflavik Intl

Fly to

St. Louis

Route

Depart

Return

Price

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 6/13

12:00 pm-10:45 am

1 stop27h 45m

Lambert-St Louis

Fri 6/20

8:25 am-8:30 am

2 stops19h 05m

$744

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Thu 5/15

11:25 am-8:48 pm

1 stop14h 23m

Lambert-St Louis

Mon 5/19

6:00 am-9:30 am

1 stop22h 30m

$779

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Thu 5/15

11:25 am-4:35 pm

2 stops34h 10m

Lambert-St Louis

Mon 5/19

7:06 pm-6:20 am

2 stops30h 14m

$787

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Sat 6/14

9:30 am-11:22 pm

1 stop18h 52m

Lambert-St Louis

Sat 6/21

3:42 pm-9:30 am

2 stops12h 48m

$806

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Thu 5/15

11:25 am-11:38 pm

2 stops17h 13m

Lambert-St Louis

Mon 5/19

3:40 pm-9:30 am

2 stops12h 50m

$905

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 6/13

12:25 am-10:45 pm

2 stops27h 20m

Lambert-St Louis

Sat 6/21

1:10 pm-11:35 pm

2 stops29h 25m

$1,010

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Wed 8/13

9:35 am-8:30 pm

2 stops15h 55m

$452

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Wed 9/3

7:35 pm-12:10 pm

2 stops21h 35m

$621

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 8/29

8:50 am-4:47 pm

1 stop12h 57m

$739

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Wed 8/13

9:30 am-9:35 pm

3 stops17h 05m

$1,374

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 11 results
1
2
  • Most accurate provider: When it comes to deals on Reykjavik Keflavik Intl Airport-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Reykjavik Keflavik Intl Airport-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Reykjavik Keflavik Intl Airport-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Reykjavik Keflavik Intl Airport-St. Louis 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 Reykjavik Keflavik Intl Airport-St. Louis 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 Keflavik Intl to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Keflavik Intl 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.

Cheapflights Insights

Everything you need to know about your flight from Reykjavik Keflavik Intl Airport to St. Louis

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, 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 80.6 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 St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated April 30, 2025.
Delta
8.0
Very good
7,936 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,936 reviews
Delta
8.0
Very good
7,936 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,333 reviews
Delta
8.0
Very good
7,936 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.6
Good
780 reviews
Delta
8.0
Very good
7,936 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Air France
7.4
Good
1,446 reviews
Delta
8.0
Very good
7,936 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,936 reviews

Food

7.3

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Crew

8.5

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Keflavik Intl to St. Louis. 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 into for flights to St. Louis from Reykjavik Keflavik Intl?

    If you book a flight to St. Louis from Reykjavik Keflavik Intl, you will be flying to Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 0 flights from Reykjavik Keflavik Intl to Lambert-St Louis per day from 0 different airlines.

  • What are the cheapest airlines to fly from Reykjavik Keflavik Intl Airport to St. Louis one-way?

    For one-way options, check prices for WestJet. According to our data, you can fly for as low as $452. Users have also found prices from $739 and $1,374 on Delta and Air Canada, respectively.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Keflavik Intl to St. Louis 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 Reykjavik Keflavik Intl Airport to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Reykjavik Keflavik Intl Airport to St. Louis (average of $311). Flying from Reykjavik Keflavik Intl Airport to St. Louis in March is currently the most expensive (average of $356). 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

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
Fenton
Maryland Heights
Fairview Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Glencoe
Alton
Farmington
O'Fallon

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