HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$629+ 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 5/22. Fares are subject to change and may not be available on all flights or dates of travel.
KEF — STL
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Keflavik Intl to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Keflavik Intl to St. Louis

Best flights from Keflavik Intl to St. Louis
Discover carefully curated flight deals from Keflavik Intl to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 15, 2025.

This American Airlines deal was found by Cheapflights users on 12/12. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1811:50 amKEF - STL
2 stops41h 02mAmerican Airlines
Sun 3/226:33 pmSTL - KEF
2 stops59h 17mAmerican Airlines
Deal found 12/12$987

Find 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 December 15, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
1 star

Round-trip from

$987
(American Airlines)

One-way from

$629
(American Airlines)
Provider with most accurate pricing for Reykjavik Keflavik Intl-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Reykjavik Keflavik Intl-Lambert-St Louis flights.
Search Deals
From Reykjavik Keflavik Intl to Lambert-St Louis
Search Deals
One-way flight from Reykjavik Keflavik Intl to Lambert-St Louis
Search Deals

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 December 15, 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

Wed 3/18

11:50 am-11:52 pm

2 stops41h 02m

Lambert-St Louis

Sun 3/22

6:33 pm-10:50 am

2 stops59h 17m

$987

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 5/22

8:35 am-11:23 pm

2 stops19h 48m

$629

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

  • 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.

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 41h 02m. American Airlines provides one of the quickest options available for as low as $987. 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.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Swansea
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Keflavik Intl to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Keflavik Intl to Kansas City flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.