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

$620+ 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
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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

One-way flights from Keflavik Intl to St. Louis
Search for one-way flight options from Keflavik Intl to St. Louis. Find affordable one-way fares based on user searches. Data last updated January 29, 2026.

This Finnair deal was found by Cheapflights users on 1/27. 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.
Fri 5/225:10 pm
KEF
-
STL
2 stops35h 32m
Finnair
Deal found 1/27$620
This Finnair deal was found by Cheapflights users on 1/28. 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.
Thu 7/25:15 pm
KEF
-
STL
2 stops35h 27m
Finnair
Deal found 1/28$710
This KLM deal was found by Cheapflights users on 1/27. 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.
Fri 5/229:30 am
KEF
-
STL
1 stop10h 01m
KLM
Deal found 1/27$895
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Thu 7/27:45 pm
KEF
-
STL
1 stop27h 49m
Multiple Airlines
Deal found 1/28$911

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars
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

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 January 29, 2026.
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 5/22

5:10 pm-11:42 pm

2 stops35h 32m

$620

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Thu 7/2

5:15 pm-11:42 pm

2 stops35h 27m

$710

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 5/22

9:30 am-2:31 pm

1 stop10h 01m

$895

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Thu 7/2

7:45 pm-6:34 pm

1 stop27h 49m

$911

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

  • 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.

  • 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
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.