Cheap Flights from St Louis to Reykjavik Keflavik

Compare St Louis to Reykjavik Keflavik flight deals

Find the cheapest month or even day of the year to fly to Reykjavik Keflavik

Book the best Reykjavik Keflavik fare with no extra fees

Flight deals from St Louis to Reykjavik Keflavik

Looking for a cheap last-minute deal or the best return flight from St Louis to Reykjavik Keflavik? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from St Louis to Reykjavik Keflavik

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Reykjavik Keflavik flights are currently cheapest in September.

St Louis to Reykjavik Keflavik: Alternative routes

Compare routes from St Louis to Reykjavik below. You may find an airport to fly into that's cheaper, faster, or easier than Reykjavik Keflavik.

St Louis to Reykjavik: Flight information

The things to know before you go.
Cheapest flight foundR 6,308
Cheapest month to flySeptember

Finding cheap flights from St Louis to Reykjavik Keflavik: Frequently asked questions

The best price we found for a return flight from St Louis to Reykjavik Keflavik is R 10,127. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from St Louis to Reykjavik Keflavik. But we found flights with one or more stops from R 10,127.
As of August 2025, there are no flights flying from St Louis to Reykjavik Keflavik.
The cheapest month to fly from St Louis to Reykjavik Keflavik is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Reykjavik Keflavik Airport on Tuesday, 16 September 2025.
No airlines currently offer direct flights between St Louis Airport and Reykjavik Keflavik Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Reykjavik Keflavik but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Reykjavik is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Air Canada offers the cheapest flight tickets to Reykjavik Keflavik.

Travelling from Lambert-St. Louis International Airport (STL) to Keflavik International Airport (KEF): what you need to know

  • Reykjavik's timezone is UTC+0, which makes Reykjavik five hours ahead of St Louis.

  • To ensure you catch your STL to KEF flight, allow plenty of time for things like check-in and baggage drop. Turning up two hours ahead of international departures and one hour before domestic flights is the general rule.

  • Be prepared for bigger queues in popular months such as July. Arriving up to four hours ahead of international flights and two hours for domestic departures is a wise move.

  • We make it simple to book a flight with a stopover. To see your options for tickets from Lambert-St. Louis International Airport to Keflavik International Airport, deselect 'Direct flights only.' Then, pick a flight that has a stop long enough to visit the city of your choice. Some great stopovers between STL and KEF include:

    • Logan International Airport

    • Pearson International Airport

    • O'Hare International Airport

How to find the cheapest flights from Lambert-St. Louis International Airport (STL) to Keflavik International Airport (KEF)

  • R 6,308 is the best price for a one-way Lambert-St. Louis International Airport to Keflavik International Airport flight. Return flights start from R 10,127. These prices may change depending on availability.

  • Don't wait until the last minute. You're more likely to get cheap tickets from STL to KEF if you book in advance. Airlines often offer some great early bird discounts.

  • The 'Whole month' search function shows you the cheapest flights from Lambert-St. Louis International Airport to Keflavik International Airport across each month. It's a good way to snap up a bargain if your travel plans are flexible.

  • Cut down on the time spent looking for cheap flights from STL to KEF by setting up a Price Alert. You'll get an email or push notification on the app when fares go down.

  • Find the perfect flight for you with the help of the filters. To see the 'Best,' 'Fastest' or 'Cheapest' flights from Lambert-St. Louis International Airport to Keflavik International Airport, use the 'Sort by' function. You can also filter by arrival and departure times, airline, and number of stops.

Handy information about Lambert-St. Louis International Airport (STL)

Arriving at Keflavik International Airport (KEF)

Getting from Keflavik International Airport (KEF) to central Reykjavik

  • Keflavik International Airport is approximately 48 kilometres from central Reykjavik. Driving there takes about 50 minutes.

  • If you're using public transport, expect a journey of around 1 hour 15 minutes.

When to fly to Keflavik International Airport (KEF)

  • The quietest month for a flight from Lambert-St. Louis International Airport to Keflavik International Airport is January, while July is the most popular. Pick the best time to visit Reykjavik based on whether you prefer a laid-back vibe or a more bustling atmosphere.

  • When reserving your flight from Lambert-St. Louis International Airport to Keflavik International Airport, consider the type of weather you like. July is the warmest month in Reykjavik, with temperatures ranging from 8ºC (46ºF) to 15ºC (59ºF).

  • December sees average temperatures of between -6ºC (21ºF) and 4ºC (39ºF). Look for cheap tickets from STL to KEF sometime then if you'd rather travel in cooler conditions.

Explore more of Iceland

  • Reykjavik has plenty to offer, but there are so many other parts of Iceland just waiting to be explored. Around 5 kilometres south of Reykjavik, a trip to Kópavogur will keep you on the go. Don't miss top attractions like Yndisgarðurinn, Fífu parkið and Elliðavatns-stífla.

  • Hafnarfjörður is another must-experience destination in Iceland and is around 10 kilometres south of Reykjavik. No journey is complete without a visit to Höfðaskógur forest, Dog relief area in Hafnarfjordur and Víðistaðatún.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.