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Cheap flights from St. Louis to Reykjavik from $683

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Reykjavik departing on 12/2. 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

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Multiple Airlines Logo
1:20 pm - 9:00 amSTL-KEF
37h 40m2 stops
Multiple Airlines Logo
10:00 am - 10:25 amKEF-STL
30h 25m2 stops
$683Multiple Airlines
Find Deal
Tue, Dec 2 - Tue, Dec 9
Finnair Logo
12:01 pm - 4:25 pmSTL-KEF
23h 24m2 stops
Finnair Logo
8:35 am - 6:15 pmKEF-STL
38h 40m2 stops
$685Finnair
Find Deal
Tue, Mar 31 - Sun, Apr 5
Multiple Airlines Logo
9:54 am - 6:15 amSTL-KEF
14h 21m1 stop
Multiple Airlines Logo
5:15 pm - 10:33 pmKEF-STL
35h 18m1 stop
$715Multiple Airlines
Find Deal
Mon, Dec 8 - Mon, Dec 15
Finnair Logo
11:41 am - 9:15 amSTL-KEF
39h 34m2 stops
Finnair Logo
10:00 am - 7:29 pmKEF-STL
39h 29m2 stops
$723Finnair
Find Deal
Thu, Jan 1 - Mon, Jan 12
Lufthansa Logo
5:18 pm - 11:30 pmSTL-KEF
25h 12m2 stops
Lufthansa Logo
1:15 am - 1:30 pmKEF-STL
17h 15m2 stops
$736Lufthansa
Find Deal
Tue, Mar 31 - Sat, Apr 4
Multiple Airlines Logo
11:46 am - 5:15 pmSTL-KEF
23h 29m2 stops
Multiple Airlines Logo
6:00 pm - 7:26 pmKEF-STL
31h 26m2 stops
$753Multiple Airlines
Find Deal
Fri, Feb 13 - Sat, Feb 21
Scandinavian Airlines Logo
11:40 am - 3:25 pmSTL-KEF
21h 45m2 stops
Scandinavian Airlines Logo
11:30 am - 8:24 amKEF-STL
26h 54m2 stops
$838Scandinavian Airlines
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Mon, Dec 8 - Mon, Dec 15
American Airlines Logo
2:50 pm - 5:15 pmSTL-KEF
20h 25m2 stops
American Airlines Logo
11:50 am - 9:03 amKEF-STL
27h 13m3 stops
$947American Airlines
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Thu, Jan 1 - Mon, Jan 12
British Airways Logo
6:46 pm - 10:45 amSTL-KEF
33h 59m2 stops
British Airways Logo
11:50 am - 6:16 pmKEF-STL
36h 26m2 stops
$1,134British Airways
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Tue, Jan 27 - Mon, Feb 2
American Airlines Logo
6:29 pm - 5:05 pmSTL-KEF
17h 36m2 stops
American Airlines Logo
6:10 pm - 5:57 pmKEF-STL
28h 47m2 stops
$1,326American Airlines
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Sat, Mar 14 - Fri, Mar 20

Finnair flights from St. Louis to Reykjavik Keflavik Intl Airport

Our best Finnair deals on St. Louis to Reykjavik Keflavik Intl Airport flight tickets
Finnair
Mar 31
STL12:01 pmLambert-St Louis
23h 24m
2 stops
KEF4:25 pmReykjavik Keflavik Intl
Apr 5
KEF8:35 amReykjavik Keflavik Intl
38h 40m
2 stops
STL6:15 pmLambert-St Louis
$685
Find similar
Finnair
Jan 1
STL11:41 amLambert-St Louis
39h 34m
2 stops
KEF9:15 amReykjavik Keflavik Intl
Jan 12
KEF10:00 amReykjavik Keflavik Intl
39h 29m
2 stops
STL7:29 pmLambert-St Louis
$723
Find similar
Finnair
Dec 8
STL1:20 pmLambert-St Louis
37h 55m
2 stops
KEF9:15 amReykjavik Keflavik Intl
Dec 15
KEF9:45 amReykjavik Keflavik Intl
39h 44m
2 stops
STL7:29 pmLambert-St Louis
$1,146
Find similar

Lufthansa flights from St. Louis to Reykjavik Keflavik Intl Airport

Our best Lufthansa deals on St. Louis to Reykjavik Keflavik Intl Airport flight tickets
Lufthansa
Nov 12
STL3:50 pmLambert-St Louis
16h 25m
2 stops
KEF2:15 pmReykjavik Keflavik Intl
Nov 18
KEF3:20 pmReykjavik Keflavik Intl
28h 35m
1 stop
STL1:55 pmLambert-St Louis
$731
Find similar
Lufthansa
Mar 31
STL5:18 pmLambert-St Louis
25h 12m
2 stops
KEF11:30 pmReykjavik Keflavik Intl
Apr 4
KEF1:15 amReykjavik Keflavik Intl
17h 15m
2 stops
STL1:30 pmLambert-St Louis
$736
Find similar
Lufthansa
Nov 12
STL3:50 pmLambert-St Louis
16h 25m
2 stops
KEF2:15 pmReykjavik Keflavik Intl
Nov 18
KEF3:20 pmReykjavik Keflavik Intl
32h 19m
2 stops
STL5:39 pmLambert-St Louis
$741
Find similar

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 November 4, 2025.
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

Tue 12/2

1:20 pm-9:00 am

2 stops37h 40m

Reykjavik Keflavik Intl

Tue 12/9

10:00 am-10:25 am

2 stops30h 25m

$683

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 3/31

12:01 pm-4:25 pm

2 stops23h 24m

Reykjavik Keflavik Intl

Sun 4/5

8:35 am-6:15 pm

2 stops38h 40m

$685

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Mon 12/8

9:54 am-6:15 am

1 stop14h 21m

Reykjavik Keflavik Intl

Mon 12/15

5:15 pm-10:33 pm

1 stop35h 18m

$715

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Thu 1/1

11:41 am-9:15 am

2 stops39h 34m

Reykjavik Keflavik Intl

Mon 1/12

10:00 am-7:29 pm

2 stops39h 29m

$723

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 3/31

5:18 pm-11:30 pm

2 stops25h 12m

Reykjavik Keflavik Intl

Sat 4/4

1:15 am-1:30 pm

2 stops17h 15m

$736

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Fri 2/13

11:46 am-5:15 pm

2 stops23h 29m

Reykjavik Keflavik Intl

Sat 2/21

6:00 pm-7:26 pm

2 stops31h 26m

$753

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Mon 12/8

11:40 am-3:25 pm

2 stops21h 45m

Reykjavik Keflavik Intl

Mon 12/15

11:30 am-8:24 am

2 stops26h 54m

$838

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Thu 1/1

2:50 pm-5:15 pm

2 stops20h 25m

Reykjavik Keflavik Intl

Mon 1/12

11:50 am-9:03 am

3 stops27h 13m

$947

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Tue 1/27

6:46 pm-10:45 am

2 stops33h 59m

Reykjavik Keflavik Intl

Mon 2/2

11:50 am-6:16 pm

2 stops36h 26m

$1,134

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

Sat 3/14

6:29 pm-5:05 pm

2 stops17h 36m

Reykjavik Keflavik Intl

Fri 3/20

6:10 pm-5:57 pm

2 stops28h 47m

$1,326

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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 day to depart on your flight to Reykjavik Keflavik Intl Airport?

The cheapest day to depart from St. Louis to Reykjavik Keflavik Intl Airport is on a Wednesday when prices can be found for as low as $792. The most expensive day to fly to Reykjavik Keflavik Intl Airport is Thursday, with ticket prices averaging around $1,102.

What is the cheapest time of day to depart on your flight to Reykjavik Keflavik Intl Airport?

The cheapest time of day to fly to Reykjavik Keflavik Intl Airport is in the morning when flights can be purchased for as low as $835. Flights in the afternoon are often more expensive with an average ticket price of $1,022.

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

Direct flights

None
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.
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  • 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 14h 21m 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
Air CanadaPriceFrom $566Free CancellationRating
7.1
10,403 reviews
Search Air Canada flights
United AirlinesPriceFrom $595Free CancellationRating
7.4
9,001 reviews
Search United Airlines flights
DeltaPriceFrom $636Free CancellationRating
7.9
8,004 reviews
Search Delta flights
KLMPriceFrom $828Free CancellationRating
7.7
1,405 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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