Latest deals
Insights
When to book
FAQs
Price Alerts

Cheap flights from Reykjavik Keflavik Intl Airport to St. Louis from $399

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Reykjavik Keflavik Intl Airport to St. Louis departing on 5/19. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Reykjavik Keflavik Intl Airport to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
12:00 pm - 9:13 pm
KEF
-
STL
14h 13m
1 stop
United Airlines Logo
8:35 am - 8:50 am
STL
-
KEF
19h 15m
2 stops
$876United Airlines
Tue, May 19 - Tue, May 26
KLM Logo
11:25 am - 3:39 pm
KEF
-
STL
33h 14m
2 stops
KLM Logo
9:59 am - 9:30 am
STL
-
KEF
18h 31m
2 stops
$884KLM
Fri, Apr 17 - Tue, Apr 21
Multiple Airlines Logo
8:00 pm - 12:22 pm
KEF
-
STL
21h 22m
2 stops
Multiple Airlines Logo
4:05 pm - 7:10 pm
STL
-
KEF
22h 05m
3 stops
$1,373Multiple Airlines
Fri, Apr 17 - Tue, Apr 21
Multiple Airlines Logo
5:00 pm - 9:52 pm
KEF
-
STL
33h 52m
3 stops
Multiple Airlines Logo
4:05 pm - 11:35 pm
STL
-
KEF
26h 30m
3 stops
$1,489Multiple Airlines
Fri, Apr 17 - Tue, Apr 21
Multiple Airlines Logo
4:50 pm - 3:24 pm
KEF
-
STL
27h 34m
1 stop
Multiple Airlines Logo
7:00 am - 6:15 am
STL
-
KEF
18h 15m
1 stop
$2,091Multiple Airlines
Fri, Apr 17 - Tue, Apr 21

momondo Fare Finder

 
Customize your flight search to find flights from Reykjavik Keflavik Intl Airport 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, momondo users made 832,500 searches. Data last updated April 5, 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Tue 5/19

12:00 pm-9:13 pm

1 stop14h 13m

Lambert-St Louis

Tue 5/26

8:35 am-8:50 am

2 stops19h 15m

$876

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 4/17

11:25 am-3:39 pm

2 stops33h 14m

Lambert-St Louis

Tue 4/21

9:59 am-9:30 am

2 stops18h 31m

$884

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 4/17

8:00 pm-12:22 pm

2 stops21h 22m

Lambert-St Louis

Tue 4/21

4:05 pm-7:10 pm

3 stops22h 05m

$1,373

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 4/17

5:00 pm-9:52 pm

3 stops33h 52m

Lambert-St Louis

Tue 4/21

4:05 pm-11:35 pm

3 stops26h 30m

$1,489

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 4/17

4:50 pm-3:24 pm

1 stop27h 34m

Lambert-St Louis

Tue 4/21

7:00 am-6:15 am

1 stop18h 15m

$2,091
Cheapest one-way

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Tue 5/19

9:00 am-6:06 pm

3 stops38h 06m

$399

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Mon 5/18

9:00 am-5:33 pm

2 stops37h 33m

$433

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Tue 5/19

9:00 am-6:06 pm

2 stops38h 06m

$442

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Sat 5/16

7:50 pm-8:55 am

2 stops42h 05m

$594
Quickest one-way

ReykjavikSt. Louis

KEF - STL

KEFSTL

Reykjavik Keflavik Intl

Fri 5/15

5:00 pm-8:55 am

2 stops20h 55m

$604

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

See travel insights to St. Louis from

How to get the cheapest flight ticket from Reykjavik Keflavik Intl Airport to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Can stopping save me money on Reykjavik Keflavik Intl Airport to St. Louis flights?

You could potentially save up to 36% on your flight if you consider stops on a Reykjavik Keflavik Intl Airport to St. Louis flight.

When to book flights from Reykjavik Keflavik Intl Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Reykjavik Keflavik Intl Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Reykjavik Keflavik Intl Airport to St. Louis (KEF to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Reykjavik Keflavik Intl Airport to St. Louis

Fastest flight time

33h 14m

Direct flights

None
The fastest flight from Reykjavik Keflavik Intl Airport to St. Louis takes 33h 14m
There are no direct flights from Reykjavik Keflavik Intl Airport to St. Louis. There are no popular flight routes from Reykjavik Keflavik Intl Airport to St. Louis.
Search flight deals

Frequently asked questions about flying from Reykjavik Keflavik Intl Airport to St. Louis

  • How far is Reykjavik Keflavik Intl to Lambert-St Louis by plane?

    The straight-line distance from Reykjavik Keflavik Intl to Lambert-St Louis is 3192.8 mi. Typically, this will take 33h 14m by plane in normal conditions.

  • When did momondo last update prices for flights from Reykjavik Keflavik Intl Airport to Lambert-St Louis Airport?

    Prices for flights from Reykjavik Keflavik Intl Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Reykjavik Keflavik Intl Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Reykjavik Keflavik Intl Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents required for your trip to Lambert-St Louis Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Lambert-St Louis Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
O'Fallon
Florissant
St. Peters
Collinsville
Alton
Wentzville
Fenton
Farmington
Clayton
Festus
Eureka
Edwardsville
Litchfield
Shrewsbury
Grafton

Why use momondo?

Why should I use momondo to find a flight deal from Reykjavik to St. Louis?

It is quick and easy to find Reykjavik to St. Louis flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to St. Louis that suits you.

Can I find flights from Reykjavik to St. Louis with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to St. Louis from Reykjavik with this policy.

How can momondo help me find flights from Reykjavik to St. Louis?

Once you have performed a search for Reykjavik to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Reykjavik to St. Louis right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Reykjavik to St. Louis flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 5/5
Tue 5/12
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States