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Cheap flights from St. Louis to Reykjavik from $646

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 3/14. 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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Find the cheapest flights from St. Louis to Reykjavik

Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
11:42 am - 4:15 pm
STL
-
KEF
23h 33m
2 stops
Scandinavian Airlines Logo
10:30 am - 11:36 pm
KEF
-
STL
42h 06m
2 stops
$850Scandinavian Airlines
Thu, Apr 16 - Mon, Apr 20
Finnair Logo
5:21 pm - 7:50 am
STL
-
KEF
33h 29m
2 stops
Finnair Logo
8:40 am - 7:30 pm
KEF
-
STL
39h 50m
2 stops
$872Finnair
Sun, Apr 19 - Sat, Apr 25
Scandinavian Airlines Logo
1:02 pm - 4:15 pm
STL
-
KEF
22h 13m
2 stops
Scandinavian Airlines Logo
10:30 am - 11:36 pm
KEF
-
STL
42h 06m
2 stops
$881Scandinavian Airlines
Thu, Apr 16 - Mon, Apr 20
Scandinavian Airlines Logo
1:02 pm - 9:30 am
STL
-
KEF
15h 28m
2 stops
Scandinavian Airlines Logo
11:25 am - 11:36 pm
KEF
-
STL
17h 11m
2 stops
$928Scandinavian Airlines
Thu, Apr 30 - Mon, May 4
Scandinavian Airlines Logo
4:21 pm - 4:50 pm
STL
-
KEF
19h 29m
2 stops
Scandinavian Airlines Logo
10:30 am - 9:06 pm
KEF
-
STL
39h 36m
2 stops
$934Scandinavian Airlines
Mon, Mar 23 - Mon, Mar 30
Multiple Airlines Logo
7:00 am - 9:25 am
STL
-
KEF
21h 25m
1 stop
Multiple Airlines Logo
7:45 pm - 3:50 pm
KEF
-
STL
25h 05m
1 stop
$942Multiple Airlines
Tue, Apr 14 - Tue, Apr 21
Scandinavian Airlines Logo
11:42 am - 9:40 am
STL
-
KEF
40h 58m
2 stops
Scandinavian Airlines Logo
10:30 am - 9:19 pm
KEF
-
STL
39h 49m
2 stops
$970Scandinavian Airlines
Thu, Apr 16 - Mon, Apr 20
Scandinavian Airlines Logo
10:54 am - 4:15 pm
STL
-
KEF
24h 21m
2 stops
Scandinavian Airlines Logo
1:25 am - 11:59 pm
KEF
-
STL
27h 34m
2 stops
$981Scandinavian Airlines
Sat, May 9 - Wed, May 13
Lufthansa Logo
3:30 pm - 11:25 pm
STL
-
KEF
26h 55m
1 stop
Lufthansa Logo
2:20 pm - 1:25 pm
KEF
-
STL
28h 05m
1 stop
$989Lufthansa
Sun, Apr 19 - Sat, Apr 25
Virgin Atlantic Logo
10:50 am - 9:30 am
STL
-
KEF
17h 40m
2 stops
Virgin Atlantic Logo
11:25 am - 11:13 pm
KEF
-
STL
16h 48m
2 stops
$1,003Virgin Atlantic
Wed, Apr 15 - Wed, Apr 22

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

Our best Scandinavian Airlines deals on St. Louis to Reykjavik Keflavik Intl Airport flight tickets
Scandinavian Airlines
Apr 16
STL11:42 amLambert-St Louis
23h 33m
2 stops
KEF4:15 pmReykjavik Keflavik Intl
Apr 20
KEF10:30 amReykjavik Keflavik Intl
42h 06m
2 stops
STL11:36 pmLambert-St Louis
$850
Scandinavian Airlines
Apr 16
STL1:02 pmLambert-St Louis
22h 13m
2 stops
KEF4:15 pmReykjavik Keflavik Intl
Apr 20
KEF10:30 amReykjavik Keflavik Intl
42h 06m
2 stops
STL11:36 pmLambert-St Louis
$881
Scandinavian Airlines
Apr 30
STL1:02 pmLambert-St Louis
15h 28m
2 stops
KEF9:30 amReykjavik Keflavik Intl
May 4
KEF11:25 amReykjavik Keflavik Intl
17h 11m
2 stops
STL11:36 pmLambert-St Louis
$928

KLM flights from St. Louis to Reykjavik Keflavik Intl Airport

Our best KLM deals on St. Louis to Reykjavik Keflavik Intl Airport flight tickets
KLM
May 9
STL4:00 pmLambert-St Louis
10h 40m
1 stop
KEF7:40 amReykjavik Keflavik Intl
May 14
KEF9:30 amReykjavik Keflavik Intl
12h 19m
1 stop
STL4:49 pmLambert-St Louis
$1,298
KLM
May 9
STL4:00 pmLambert-St Louis
10h 40m
1 stop
KEF7:40 amReykjavik Keflavik Intl
May 14
KEF11:25 amReykjavik Keflavik Intl
14h 59m
2 stops
STL9:24 pmLambert-St Louis
$1,302

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 March 2, 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

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Thu 4/16

11:42 am-4:15 pm

2 stops23h 33m

Reykjavik Keflavik Intl

Mon 4/20

10:30 am-11:36 pm

2 stops42h 06m

$850

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sun 4/19

5:21 pm-7:50 am

2 stops33h 29m

Reykjavik Keflavik Intl

Sat 4/25

8:40 am-7:30 pm

2 stops39h 50m

$872

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Thu 4/16

1:02 pm-4:15 pm

2 stops22h 13m

Reykjavik Keflavik Intl

Mon 4/20

10:30 am-11:36 pm

2 stops42h 06m

$881

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Thu 4/30

1:02 pm-9:30 am

2 stops15h 28m

Reykjavik Keflavik Intl

Mon 5/4

11:25 am-11:36 pm

2 stops17h 11m

$928

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Mon 3/23

4:21 pm-4:50 pm

2 stops19h 29m

Reykjavik Keflavik Intl

Mon 3/30

10:30 am-9:06 pm

2 stops39h 36m

$934

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 4/14

7:00 am-9:25 am

1 stop21h 25m

Reykjavik Keflavik Intl

Tue 4/21

7:45 pm-3:50 pm

1 stop25h 05m

$942

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Thu 4/16

11:42 am-9:40 am

2 stops40h 58m

Reykjavik Keflavik Intl

Mon 4/20

10:30 am-9:19 pm

2 stops39h 49m

$970

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 5/9

10:54 am-4:15 pm

2 stops24h 21m

Reykjavik Keflavik Intl

Wed 5/13

1:25 am-11:59 pm

2 stops27h 34m

$981

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sun 4/19

3:30 pm-11:25 pm

1 stop26h 55m

Reykjavik Keflavik Intl

Sat 4/25

2:20 pm-1:25 pm

1 stop28h 05m

$989

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Wed 4/15

10:50 am-9:30 am

2 stops17h 40m

Reykjavik Keflavik Intl

Wed 4/22

11:25 am-11:13 pm

2 stops16h 48m

$1,003

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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?

British Airways is the most popular carrier 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 35% 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 35m

Direct flights

None
The fastest flight from St. Louis to Reykjavik Keflavik Intl Airport takes 8h 35m
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

  • 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 35m 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 $592Free CancellationRating
7.4
9,375 reviews
Search United Airlines flights
Air CanadaPriceFrom $604Free CancellationRating
7.1
10,769 reviews
Search Air Canada flights
DeltaPriceFrom $636Free CancellationRating
7.9
8,238 reviews
Search Delta flights
KLMPriceFrom $828Free CancellationRating
7.7
1,461 reviews
Search KLM 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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