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Cheap flights from St. Louis to Reykjavik from $371

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Reykjavik departing on 8/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
8:40 am - 8:45 am
STL
-
KEF
19h 05m
1 stop
Air Canada Logo
10:00 am - 12:11 pm
KEF
-
STL
31h 11m
2 stops
$853Air Canada
Sun, Jun 21 - Tue, Jun 30
United Airlines Logo
5:59 pm - 8:45 am
STL
-
KEF
33h 46m
2 stops
United Airlines Logo
9:50 am - 3:38 pm
KEF
-
STL
34h 48m
2 stops
$923United Airlines
Sat, Aug 15 - Wed, Aug 26
United Airlines Logo
7:01 pm - 8:45 am
STL
-
KEF
32h 44m
2 stops
United Airlines Logo
9:15 am - 9:24 pm
KEF
-
STL
41h 09m
2 stops
$929United Airlines
Sat, Oct 10 - Wed, Oct 21
United Airlines Logo
1:00 pm - 8:30 am
STL
-
KEF
14h 30m
1 stop
United Airlines Logo
9:15 am - 11:45 pm
KEF
-
STL
43h 30m
2 stops
$934United Airlines
Tue, Sep 1 - Wed, Sep 30
United Airlines Logo
5:59 pm - 8:45 am
STL
-
KEF
33h 46m
2 stops
United Airlines Logo
9:50 am - 8:07 pm
KEF
-
STL
15h 17m
1 stop
$936United Airlines
Sat, Aug 15 - Wed, Aug 26
United Airlines Logo
5:30 pm - 8:45 am
STL
-
KEF
34h 15m
2 stops
United Airlines Logo
9:15 am - 12:13 pm
KEF
-
STL
31h 58m
2 stops
$938United Airlines
Tue, Sep 1 - Wed, Sep 30
United Airlines Logo
5:30 pm - 8:50 am
STL
-
KEF
10h 20m
1 stop
United Airlines Logo
9:15 am - 6:41 pm
KEF
-
STL
14h 26m
1 stop
$948United Airlines
Tue, Sep 1 - Wed, Sep 30
KLM Logo
6:09 pm - 7:40 am
STL
-
KEF
8h 31m
1 stop
KLM Logo
11:25 am - 11:58 pm
KEF
-
STL
17h 33m
2 stops
$955KLM
Sat, Aug 15 - Wed, Aug 26
United Airlines Logo
5:30 pm - 8:50 am
STL
-
KEF
10h 20m
1 stop
United Airlines Logo
9:15 am - 12:13 pm
KEF
-
STL
31h 58m
2 stops
$964United Airlines
Sun, Sep 20 - Wed, Sep 30
United Airlines Logo
6:54 pm - 7:55 am
STL
-
KEF
32h 01m
2 stops
United Airlines Logo
9:15 am - 2:11 pm
KEF
-
STL
33h 56m
2 stops
$967United Airlines
Mon, Sep 21 - Wed, Sep 30

Air Canada flights from St. Louis to Reykjavik Keflavik Intl Airport

Our best Air Canada deals on St. Louis to Reykjavik Keflavik Intl Airport flight tickets
Air Canada
Jun 21
STL8:40 amLambert-St Louis
19h 05m
1 stop
KEF8:45 amReykjavik Keflavik Intl
Jun 30
KEF10:00 amReykjavik Keflavik Intl
31h 11m
2 stops
STL12:11 pmLambert-St Louis
$853
Air Canada
Sep 21
STL2:40 pmLambert-St Louis
36h 15m
2 stops
KEF7:55 amReykjavik Keflavik Intl
Sep 30
KEF9:15 amReykjavik Keflavik Intl
33h 56m
2 stops
STL2:11 pmLambert-St Louis
$971
Air Canada
Jul 1
STL12:10 pmLambert-St Louis
14h 45m
1 stop
KEF7:55 amReykjavik Keflavik Intl
Jul 10
KEF9:15 amReykjavik Keflavik Intl
31h 56m
2 stops
STL12:11 pmLambert-St Louis
$973

United Airlines flights from St. Louis to Reykjavik Keflavik Intl Airport

Our best United Airlines deals on St. Louis to Reykjavik Keflavik Intl Airport flight tickets
United Airlines
Aug 15
STL5:59 pmLambert-St Louis
33h 46m
2 stops
KEF8:45 amReykjavik Keflavik Intl
Aug 26
KEF9:50 amReykjavik Keflavik Intl
34h 48m
2 stops
STL3:38 pmLambert-St Louis
$923
United Airlines
Oct 10
STL7:01 pmLambert-St Louis
32h 44m
2 stops
KEF8:45 amReykjavik Keflavik Intl
Oct 21
KEF9:15 amReykjavik Keflavik Intl
41h 09m
2 stops
STL9:24 pmLambert-St Louis
$929
United Airlines
Sep 1
STL1:00 pmLambert-St Louis
14h 30m
1 stop
KEF8:30 amReykjavik Keflavik Intl
Sep 30
KEF9:15 amReykjavik Keflavik Intl
43h 30m
2 stops
STL11:45 pmLambert-St Louis
$934

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Reykjavik Keflavik Intl Airport 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 May 23, 2026.
Use the filters below to find and compare flights from St. Louis to Reykjavik Keflavik Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sun 6/21

8:40 am-8:45 am

1 stop19h 05m

Reykjavik Keflavik Intl

Tue 6/30

10:00 am-12:11 pm

2 stops31h 11m

$853

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 8/15

5:59 pm-8:45 am

2 stops33h 46m

Reykjavik Keflavik Intl

Wed 8/26

9:50 am-3:38 pm

2 stops34h 48m

$923

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 10/10

7:01 pm-8:45 am

2 stops32h 44m

Reykjavik Keflavik Intl

Wed 10/21

9:15 am-9:24 pm

2 stops41h 09m

$929

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 9/1

1:00 pm-8:30 am

1 stop14h 30m

Reykjavik Keflavik Intl

Wed 9/30

9:15 am-11:45 pm

2 stops43h 30m

$934

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 8/15

5:59 pm-8:45 am

2 stops33h 46m

Reykjavik Keflavik Intl

Wed 8/26

9:50 am-8:07 pm

1 stop15h 17m

$936

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 9/1

5:30 pm-8:45 am

2 stops34h 15m

Reykjavik Keflavik Intl

Wed 9/30

9:15 am-12:13 pm

2 stops31h 58m

$938
Quickest round-trip

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 9/1

5:30 pm-8:50 am

1 stop10h 20m

Reykjavik Keflavik Intl

Wed 9/30

9:15 am-6:41 pm

1 stop14h 26m

$948

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 8/15

6:09 pm-7:40 am

1 stop8h 31m

Reykjavik Keflavik Intl

Wed 8/26

11:25 am-11:58 pm

2 stops17h 33m

$955

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sun 9/20

5:30 pm-8:50 am

1 stop10h 20m

Reykjavik Keflavik Intl

Wed 9/30

9:15 am-12:13 pm

2 stops31h 58m

$964

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Mon 9/21

6:54 pm-7:55 am

2 stops32h 01m

Reykjavik Keflavik Intl

Wed 9/30

9:15 am-2:11 pm

2 stops33h 56m

$967

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 18 resultsSorted by cheapest first
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See travel insights to Reykjavik from

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

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

What is the cheapest airline that flies from Lambert-St Louis to Reykjavik Keflavik Intl?

Austrian Airlines, Lufthansa, and United Airlines are the most popular carriers operating from Lambert-St Louis to Reykjavik Keflavik Intl

What airlines fly to Reykjavik Keflavik Intl Airport?

United Airlines, Delta and KLM are the top three most popular airlines that fly to Reykjavik Keflavik Intl Airport from St. Louis according to our data. United Airlines is the first choice among our users, with 45% of people opting to fly with this airline when traveling to Reykjavik Keflavik Intl Airport. Keep in mind that there are 4 different airlines that fly to Reykjavik Keflavik Intl Airport on a routine basis, so you have a few additional options to choose from.

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

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

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

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

Fastest flight time

8h 56m

Direct flights

None
The fastest flight from St. Louis to Reykjavik Keflavik Intl Airport takes 8h 56m
There are no direct flights from St. Louis to Reykjavik Keflavik Intl Airport. There are no popular flight routes from St. Louis to Reykjavik Keflavik Intl Airport.
Search flight deals

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

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

    A flight from Lambert-St Louis to Reykjavik Keflavik Intl will travel around 3192.8 mi. Typically, this will take 8h 56m by plane in normal conditions.

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

    Prices for flights from Lambert-St Louis Airport to Reykjavik Keflavik Intl Airport were last updated today.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Reykjavik Keflavik Intl Airport?

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Reykjavik Keflavik Intl Airport.

  • What documentation or ID do you need to fly to Reykjavik Keflavik Intl Airport?

    The necessary travel and health documents for your Reykjavik Keflavik Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Reykjavik Keflavik Intl Airport?

Best airlines flying from St. Louis to Reykjavik Keflavik Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Reykjavik Keflavik Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $595Free CancellationRating
7.4
9,752 reviews
Search United Airlines flights
Air CanadaPriceFrom $604Free CancellationRating
7.1
11,075 reviews
Search Air Canada flights
KLMPriceFrom $756Free CancellationRating
7.8
1,519 reviews
Search KLM flights
DeltaPriceFrom $784Free CancellationRating
7.9
8,445 reviews
Search Delta flights

Traveling to a place near Reykjavik?

Book flights to Reykjavik if you plan to visit one of these locations
Keflavik
Selfoss
Hella
Hveragerdi
Borgarnes
Grindavik
Kopavogur

Why use momondo?

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

Finding the right flight to Reykjavik from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Reykjavik quick and easy, saving you time and money.

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

Flights from St. Louis to Reykjavik with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

Once all potential St. Louis to Reykjavik flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of St. Louis to Reykjavik flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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