What are the cheapest airlines flying from St. Louis to Reykjavik Keflavik Intl Airport round-trip?

Our cheapest airline available from St. Louis to Reykjavik Keflavik Intl Airport is Air Canada. Our recent data shows that you can find tickets from as low as $566 on this airline. Additional options worth looking into are United Airlines and Delta, starting at $592 and $636 round-trip. Air Canada is 38% cheaper than the average price of flights available within the next 90 days to this destination.

What is the cheapest day to fly from St. Louis to Reykjavik Keflavik Intl Airport?

Travelers seeking maximum savings on their St. Louis to Reykjavik Keflavik Intl Airport flight should consider departing on Wednesday mornings when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Reykjavik Keflavik Intl Airport ranges from 1.6 - 3.1 inches per month. January is typically the wettest month, when rainfall can reach 3.1 in. May is typically the driest time to visit Reykjavik Keflavik Intl Airport when rainfall is around 1.6 in.

If weather is an important factor for your trip to Reykjavik Keflavik Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 51.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What are the most popular airlines that fly from St. Louis to Reykjavik Keflavik Intl Airport?

Before booking your flight from St. Louis to Reykjavik Keflavik Intl Airport check out the most popular airlines for this route: Air Canada, Delta or KLM.

What is the cheapest day to fly round-trip from St. Louis to Reykjavik Keflavik Intl Airport?

Users have found that leaving on a Tuesday can be a cost-effective option. It’s possible to save up to 39% on your flight compared to booking on days when demand is much higher.

What is the cheapest month to fly from St. Louis to Reykjavik Keflavik Intl Airport?

The best pricing can be found in the month of January. Prices to Reykjavik Keflavik Intl Airport from St. Louis average $992. You can even find prices in January for less than $992, as users have found deals to Reykjavik Keflavik Intl Airport from as low as $701. The month of March appears to be one of the more expensive times to travel to Reykjavik Keflavik Intl Airport from St. Louis. Flying in the targeted month can save you up to 48%.

What is the cheapest time of day to fly from STL to KEF?

When flying from St. Louis to Reykjavik Keflavik Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 19% versus a flight in the afternoon.

What airport do you fly from for flights from St. Louis to Reykjavik Keflavik Intl?

Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Reykjavik Keflavik Intl from St. Louis. Booking flights from Lambert-St Louis (STL) to Reykjavik Keflavik Intl should be relatively easy as there are 0 daily outbound flights to Reykjavik Keflavik Intl from 4 different airlines.

Can I find deals for flights from St. Louis to Keflavik Intl that include hotel bookings?

Yes. In addition to deals on St. Louis to Keflavik Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Keflavik Intl?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Keflavik Intl.

Can I find deals for business class flights from St. Louis to Keflavik Intl?

Yes. Cheapflights offers flight deals from St. Louis to Keflavik Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$259+ Flights from St. Louis to Reykjavik Keflavik Intl Airport

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Cheap flight deals from St. Louis to Keflavik Intl

Round-trip from	$652 (KAYAK)
One-way from	$259 (Kiwi.com)
Popular in	June
Cheapest in	May
Average price	$905

From Lambert-St Louis to Reykjavik Keflavik Intl

Search Deals

One-way flight from Lambert-St Louis to Reykjavik Keflavik Intl

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($68 potential increase over avg. RT price).

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Cheapest flight prices on average. 2% potential price decrease ($26 potential savings vs. average RT price).

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Average for round-trip flights in August 2025

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Find flight deals from St. Louis to Keflavik Intl

Cheapest flights from St. Louis to Keflavik Intl
Explore the most affordable flight options available from St. Louis to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 18, 2025.

dom. 8/245:15 pmSTL - KEF

2 stops35h 05mMultiple Airlines

jue. 9/47:35 pmKEF - STL

2 stops21h 25mMultiple Airlines

Deal found 8/17

$630

dom. 11/236:43 pmSTL - KEF

2 stops38h 32mLufthansa

mar. 12/24:15 pmKEF - STL

1 stop27h 40mLufthansa

Deal found 8/16

$652

mié. 11/193:50 pmSTL - KEF

2 stops16h 25mLufthansa

mar. 12/24:15 pmKEF - STL

1 stop27h 40mLufthansa

Deal found 8/16

$659

vie. 8/221:30 pmSTL - KEF

1 stop13h 50mUnited Airlines

mar. 8/269:50 amKEF - STL

2 stops38h 09mUnited Airlines

Deal found 8/15

$680

vie. 8/228:10 amSTL - KEF

2 stops19h 10mAir Canada

mar. 8/269:50 amKEF - STL

2 stops37h 02mAir Canada

Deal found 8/15

$685

dom. 12/144:39 pmSTL - KEF

2 stops36h 16mBritish Airways

mar. 12/2311:50 amKEF - STL

2 stops36h 08mBritish Airways

Deal found 8/17

$696

lun. 11/2412:31 pmSTL - KEF

2 stops20h 44mLufthansa

mar. 12/24:15 pmKEF - STL

1 stop27h 40mLufthansa

Deal found 8/16

$716

Best flights from St. Louis to Keflavik Intl
Discover carefully curated flight deals from St. Louis to Keflavik Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated agosto 18, 2025.

dom. 11/236:43 pmSTL - KEF

2 stops38h 32mLufthansa

mar. 12/24:15 pmKEF - STL

1 stop27h 40mLufthansa

Deal found 8/16

$652

dom. 12/144:39 pmSTL - KEF

2 stops36h 16mBritish Airways

mar. 12/2311:50 amKEF - STL

2 stops36h 08mBritish Airways

Deal found 8/17

$696

dom. 9/145:30 pmSTL - KEF

1 stop10h 00mUnited Airlines

dom. 9/2112:00 pmKEF - STL

1 stop14h 32mUnited Airlines

Deal found 8/16

$747

mié. 11/193:50 pmSTL - KEF

2 stops16h 25mLufthansa

mar. 12/24:15 pmKEF - STL

1 stop27h 40mLufthansa

Deal found 8/16

$659

lun. 11/2412:31 pmSTL - KEF

2 stops20h 44mLufthansa

mar. 12/24:15 pmKEF - STL

1 stop27h 40mLufthansa

Deal found 8/16

$716

mar. 11/186:43 pmSTL - KEF

2 stops37h 32mLufthansa

mar. 12/24:15 pmKEF - STL

1 stop27h 40mLufthansa

Deal found 8/16

$729

mié. 11/193:50 pmSTL - KEF

2 stops16h 25mLufthansa

jue. 11/273:10 pmKEF - STL

2 stops36h 30mLufthansa

Deal found 8/16

$751

Last-minute flights from St. Louis to Keflavik Intl
Discover last-minute flight deals from St. Louis to Keflavik Intl. Data last updated agosto 18, 2025 and is based on user searches.

vie. 8/221:30 pmSTL - KEF

1 stop13h 50mUnited Airlines

mar. 8/269:50 amKEF - STL

2 stops38h 09mUnited Airlines

Deal found 8/15

$680

vie. 8/228:10 amSTL - KEF

2 stops19h 10mAir Canada

mar. 8/269:50 amKEF - STL

2 stops37h 02mAir Canada

Deal found 8/15

$685

dom. 8/245:15 pmSTL - KEF

2 stops35h 05mMultiple Airlines

jue. 9/47:35 pmKEF - STL

2 stops21h 25mMultiple Airlines

Deal found 8/17

$630

mié. 9/1011:27 amSTL - KEF

1 stop14h 33mMultiple Airlines

mié. 9/179:30 amKEF - STL

2 stops37h 53mMultiple Airlines

Deal found 8/17

$783

sáb. 9/131:30 pmSTL - KEF

1 stop13h 40mUnited Airlines

sáb. 9/209:50 amKEF - STL

1 stop10h 28mUnited Airlines

Deal found 8/16

$789

sáb. 9/133:20 pmSTL - KEF

2 stops11h 50mAir Canada

sáb. 9/209:50 amKEF - STL

2 stops14h 37mAir Canada

Deal found 8/16

$794

dom. 9/145:30 pmSTL - KEF

1 stop10h 00mUnited Airlines

dom. 9/2112:00 pmKEF - STL

1 stop14h 32mUnited Airlines

Deal found 8/16

$747

One-way flights from St. Louis to Keflavik Intl
Search for one-way flight options from St. Louis to Keflavik Intl. Find affordable one-way fares based on user searches. Data last updated agosto 18, 2025.

sáb. 10/187:00 pmSTL - KEF

2 stops28h 55mMultiple Airlines

Deal found 8/17

$259

lun. 10/207:52 pmSTL - KEF

3 stops28h 03mMultiple Airlines

Deal found 8/17

$265

lun. 10/204:10 pmSTL - KEF

1 stop12h 20mKLM

Deal found 8/17

$470

vie. 9/58:10 amSTL - KEF

1 stop19h 20mUnited Airlines

Deal found 8/16

$545

Cheapflights Fare Finder

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

dom. 11/23

6:43 pm-3:15 pm

2 stops38h 32m

Reykjavik Keflavik Intl

mar. 12/2

4:15 pm-1:55 pm

1 stop27h 40m

$652

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

mié. 11/19

3:50 pm-2:15 pm

2 stops16h 25m

Reykjavik Keflavik Intl

mar. 12/2

4:15 pm-1:55 pm

1 stop27h 40m

$659

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

dom. 12/14

4:39 pm-10:55 am

2 stops36h 16m

Reykjavik Keflavik Intl

mar. 12/23

11:50 am-5:58 pm

2 stops36h 08m

$696

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

lun. 11/24

12:31 pm-3:15 pm

2 stops20h 44m

Reykjavik Keflavik Intl

mar. 12/2

4:15 pm-1:55 pm

1 stop27h 40m

$716

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

mar. 11/18

6:43 pm-2:15 pm

2 stops37h 32m

Reykjavik Keflavik Intl

mar. 12/2

4:15 pm-1:55 pm

1 stop27h 40m

$729

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

dom. 9/14

5:30 pm-8:30 am

1 stop10h 00m

Reykjavik Keflavik Intl

dom. 9/21

12:00 pm-9:32 pm

1 stop14h 32m

$747

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

mié. 11/19

3:50 pm-2:15 pm

2 stops16h 25m

Reykjavik Keflavik Intl

jue. 11/27

3:10 pm-9:40 pm

2 stops36h 30m

$751

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

sáb. 10/18

7:00 pm-4:55 am

2 stops28h 55m

$259

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

lun. 10/20

7:52 pm-4:55 am

3 stops28h 03m

$265

St. LouisReykjavik

STL - KEF

STLKEF

Lambert-St Louis

lun. 10/20

4:10 pm-9:30 am

1 stop12h 20m

$470

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/17

Showing 1-10 of 12 results

Best time to book a flight from St. Louis to Keflavik Intl

Have a flexible travel schedule? Discover the best time to fly to Keflavik Intl from St. Louis with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Reykjavik Keflavik Intl Airport

What is the cheapest month to book a flight from St. Louis to Reykjavik Keflavik Intl Airport?

Currently, November is the cheapest month in which you can book a flight from St. Louis to Reykjavik Keflavik Intl Airport (average of $328). Flying from St. Louis to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $655). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Keflavik Intl

See what other customers who have flown with Delta, KLM, and United Airlines from St. Louis to Reykjavik Keflavik Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very good

7,981 reviews

Delta

8.0

Very good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,385 reviews

Delta

8.0

Very good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

United Airlines

7.4

Good

8,925 reviews

Delta

8.0

Very good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Air Canada

7.1

Good

9,992 reviews

Delta

8.0

Very good

7,981 reviews

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

What airport do you fly from for flights from St. Louis to Reykjavik Keflavik Intl?
Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Reykjavik Keflavik Intl from St. Louis. Booking flights from Lambert-St Louis (STL) to Reykjavik Keflavik Intl should be relatively easy as there are 0 daily outbound flights to Reykjavik Keflavik Intl from 4 different airlines.
How long is the flight from St. Louis to Reykjavik Keflavik Intl Airport?
Departing from St. Louis to Reykjavik Keflavik Intl Airport will take you 36h 16m. The distance from St. Louis to Reykjavik Keflavik Intl Airport is about 3191 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines flying from St. Louis to Reykjavik Keflavik Intl Airport round-trip?
Our cheapest airline available from St. Louis to Reykjavik Keflavik Intl Airport is Air Canada. Our recent data shows that you can find tickets from as low as $566 on this airline. Additional options worth looking into are United Airlines and Delta, starting at $592 and $636 round-trip. Air Canada is 38% cheaper than the average price of flights available within the next 90 days to this destination.
Can I find deals for flights from St. Louis to Keflavik Intl that include hotel bookings?
Yes. In addition to deals on St. Louis to Keflavik Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Keflavik Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Keflavik Intl.
Can I find deals for business class flights from St. Louis to Keflavik Intl?
Yes. Cheapflights offers flight deals from St. Louis to Keflavik Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from St. Louis to Reykjavik Keflavik Intl Airport?
Currently, November is the cheapest month in which you can book a flight from St. Louis to Reykjavik Keflavik Intl Airport (average of $328). Flying from St. Louis to Reykjavik Keflavik Intl Airport in June is currently the most expensive (average of $655). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Keflavik

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Top 4 airlines flying from St. Louis to Keflavik Intl

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$566	Average$748	FlexibilityNo cancel fee	On-time67%
United Airlines	Cheapest$592	Average$1,106	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$636	Average$1,036	FlexibilityNo cancel fee	On-timeN/A
KLM	Cheapest$828	Average$1,168	FlexibilityNo cancel fee	On-time75%

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$259+ Cheap flights from St. Louis (STL) to Keflavik Intl (KEF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Keflavik Intl with Cheapflights

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Find flight deals from St. Louis to Keflavik Intl

Cheapest flights from St. Louis to Keflavik IntlExplore the most affordable flight options available from St. Louis to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 18, 2025.

Explore the most affordable flight options available from St. Louis to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 18, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Reykjavik Keflavik Intl Airport that are best for you.

Best time to book a flight from St. Louis to Keflavik Intl

Have a flexible travel schedule? Discover the best time to fly to Keflavik Intl from St. Louis with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Reykjavik Keflavik Intl Airport

What is the cheapest month to book a flight from St. Louis to Reykjavik Keflavik Intl Airport?

Reviews of airlines servicing Keflavik Intl

See what other customers who have flown with Delta, KLM, and United Airlines from St. Louis to Reykjavik Keflavik Intl Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Keflavik Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly from for flights from St. Louis to Reykjavik Keflavik Intl?

How long is the flight from St. Louis to Reykjavik Keflavik Intl Airport?

What are the cheapest airlines flying from St. Louis to Reykjavik Keflavik Intl Airport round-trip?

Can I find deals for flights from St. Louis to Keflavik Intl that include hotel bookings?

How can I find direct flights from St. Louis to Keflavik Intl?

Can I find deals for business class flights from St. Louis to Keflavik Intl?

What is the cheapest month to book a flight from St. Louis to Reykjavik Keflavik Intl Airport?

Traveling to a place near Reykjavik Keflavik Intl Airport?

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Top 4 airlines flying from St. Louis to Keflavik Intl

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Cheapest flights from St. Louis to Keflavik Intl
Explore the most affordable flight options available from St. Louis to Keflavik Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 18, 2025.