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$294+ 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 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — STL
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
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 September 14, 2025.

Round-trip from

$853
(Kiwi.com)

One-way from

$294
(Kiwi.com)
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 September 14, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Tue 10/284:55 pmKEF - STL
1 stop21h 12mMultiple Airlines
Tue 11/47:45 pmSTL - KEF
1 stop28h 20mMultiple Airlines
Deal found 9/13$853

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 September 14, 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

Tue 10/28

4:55 pm-9:07 am

1 stop21h 12m

Lambert-St Louis

Tue 11/4

7:45 pm-6:05 am

1 stop28h 20m

$853

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 2/13

6:10 pm-9:44 pm

2 stops33h 34m

Lambert-St Louis

Tue 2/17

6:32 pm-10:55 am

2 stops58h 23m

$961

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Sat 10/4

9:35 am-9:06 am

2 stops52h 31m

$294

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Sat 10/11

3:05 pm-10:02 am

2 stops23h 57m

$300

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Wed 10/8

3:05 pm-10:37 am

2 stops24h 32m

$310

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 10/10

12:10 am-11:47 pm

2 stops28h 37m

$1,297

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

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.

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.

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

    A quick flight from Reykjavik Keflavik Intl Airport to St. Louis can take about 33h 34m. American Airlines provides one of the quickest options available for as low as $961. The distance from Reykjavik Keflavik Intl Airport to St. Louis is about 3191 mi.

  • 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 St. Louis?

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