$582 Cheap Flights from Reykjavik (KEF) to St. Louis (STL)

View $582 flight on Fri, Oct 2, 2026Opens in a new window

Popular airlines from Reykjavik–Keflavik Intl. Airport (KEF) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Reykjavik to St. Louis (KEF-STL)

Prices were available within the past 7 days and start at $582 for one-way flights and $773 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Thu, Jan 22 - Sun, Jan 25
KEF
Reykjavik
STL
St. Louis
$773 Roundtrip, found 4 days ago
$773
Roundtrip
found 4 days ago
Select Icelandair flight, departing Thu, Jan 22 from Reykjavik to St. Louis, returning Sun, Jan 25, priced at $773 found 4 days ago
Icelandair
Wed, Jul 8 - Wed, Jul 15
KEF
Reykjavik
STL
St. Louis
$774 Roundtrip, found 3 days ago
$774
Roundtrip
found 3 days ago
Select Icelandair flight, departing Wed, Jul 8 from Reykjavik to St. Louis, returning Wed, Jul 15, priced at $774 found 3 days ago
Icelandair
Fri, Jul 10 - Sat, Jul 18
KEF
Reykjavik
STL
St. Louis
$776 Roundtrip, found 23 hours ago
$776
Roundtrip
found 23 hours ago
Select Icelandair flight, departing Fri, Jul 10 from Reykjavik to St. Louis, returning Sat, Jul 18, priced at $776 found 23 hours ago
Icelandair
Fri, Jul 10 - Sat, Jul 18
KEF
Reykjavik
STL
St. Louis
$779 Roundtrip, found 23 hours ago
$779
Roundtrip
found 23 hours ago
Select Icelandair flight, departing Fri, Jul 10 from Reykjavik to St. Louis, returning Sat, Jul 18, priced at $779 found 23 hours ago
Icelandair
Fri, Jul 10 - Sat, Jul 18
KEF
Reykjavik
STL
St. Louis
$783 Roundtrip, found 23 hours ago
$783
Roundtrip
found 23 hours ago
Select Icelandair flight, departing Fri, Jul 10 from Reykjavik to St. Louis, returning Sat, Jul 18, priced at $783 found 23 hours ago
Icelandair
Fri, Jul 10 - Sat, Jul 18
KEF
Reykjavik
STL
St. Louis
$783 Roundtrip, found 23 hours ago
$783
Roundtrip
found 23 hours ago
Select Icelandair flight, departing Fri, Jul 10 from Reykjavik to St. Louis, returning Sat, Jul 18, priced at $783 found 23 hours ago
Lufthansa
Mon, Sep 7 - Sun, Sep 13
KEF
Reykjavik
STL
St. Louis
$791 Roundtrip, found 1 day ago
$791
Roundtrip
found 1 day ago
Select Lufthansa flight, departing Mon, Sep 7 from Reykjavik to St. Louis, returning Sun, Sep 13, priced at $791 found 1 day ago
Air Canada
Fri, Jul 24 - Fri, Jul 31
KEF
Reykjavik
STL
St. Louis
$801 Roundtrip, found 2 days ago
$801
Roundtrip
found 2 days ago
Select Air Canada flight, departing Fri, Jul 24 from Reykjavik to St. Louis, returning Fri, Jul 31, priced at $801 found 2 days ago
United
Fri, Jul 24 - Fri, Jul 31
KEF
Reykjavik
STL
St. Louis
$801 Roundtrip, found 2 days ago
$801
Roundtrip
found 2 days ago
Select United flight, departing Fri, Jul 24 from Reykjavik to St. Louis, returning Fri, Jul 31, priced at $801 found 2 days ago
Delta
Fri, May 15 - Fri, May 22
KEF
Reykjavik
STL
St. Louis
$815 Roundtrip, found 8 hours ago
$815
Roundtrip
found 8 hours ago
Select Delta flight, departing Fri, May 15 from Reykjavik to St. Louis, returning Fri, May 22, priced at $815 found 8 hours ago

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Flights from Reykjavik (KEF) to St. Louis (STL)
Origin airport
Keflavik Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Air Canada, Air France, British Airways, Delta, KLM, Lufthansa, United, Virgin Atlantic
Roundtrip price
$773
Distance
3192 mi

Reykjavik to St. Louis Flights

The cheapest times to fly from Reykjavik to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Reykjavik to St. Louis are during the month of January. You can find some of the cheapest flights from Reykjavik to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Reykjavik to St. Louis

Sunday is one of the best days to book for cheap flights from Reykjavik to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Reykjavik to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Reykjavik to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $582 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Reykjavik to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Reykjavik to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL) cost?
Snag a cheap one-way flight from $582 or cheap return flight from $773 from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from KEF to STL is January, when demand is low. Off-peak season is generally when airlines offer lower prices between these airports.
What is the cheapest airline that flies from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll fly you from KEF to STL. Then, sort your results by "Price (lowest to highest)" to pick up the best deal available.
How many flights per day from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and choose either "1 Stop" or "2+ Stops."
What day of the week has the most flights from KEF to STL?
Typically you'll find the most flight options available on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the season, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL)?
To reach Lambert-St. Louis Intl. Airport (STL) on time, pick a flight that leaves Keflavik Intl. Airport (KEF) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until just before your trip to book a ticket from KEF to STL generally means paying more. While it's possible to find some last-minute deals, they aren't always guaranteed. Keep your travel plans flexible for a better chance of snagging a bargain.
Is it cheaper to book a KEF to STL flight and hotel package?
You can save money by booking a KEF to STL flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. After selecting your ideal accommodations and flights, consider adding extras including activities, tours and car rentals.
Can I cancel or change the date of my flight from Keflavik Intl. Airport (KEF) to Lambert-St. Louis Intl. Airport (STL)?
In most instances, you're able to cancel or reschedule your KEF to STL flight. However, there may be additional charges, especially if you booked over 24 hours ago. Double-check your itinerary for the airline's fees and guidelines on flight changes, or if you need more details, go to our Customer Service portal.

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*Available to One Key members.