$1,010 Cheap Flights from St. Louis (STL) to Kos (KGS)

View $1,010 flight on Wed, Jul 8, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Kos (KGS-Kos Island Intl.)

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Cheap Flights from St. Louis to Kos (STL-KGS)

Prices were available within the past 7 days and start at $1,010 for one-way flights and $1,465 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Jun 30 - Fri, Jul 17
STL
St. Louis
KGS
Kos
$1,465 Roundtrip, found 6 days ago
$1,465
Roundtrip
found 6 days ago
Select Air Canada flight, departing Tue, Jun 30 from St. Louis to Kos, returning Fri, Jul 17, priced at $1,465 found 6 days ago
United
Tue, Jun 30 - Fri, Jul 17
STL
St. Louis
KGS
Kos
$1,469 Roundtrip, found 6 days ago
$1,469
Roundtrip
found 6 days ago
Select United flight, departing Tue, Jun 30 from St. Louis to Kos, returning Fri, Jul 17, priced at $1,469 found 6 days ago
United
Tue, Jun 30 - Fri, Jul 17
STL
St. Louis
KGS
Kos
$1,471 Roundtrip, found 6 days ago
$1,471
Roundtrip
found 6 days ago
Select United flight, departing Tue, Jun 30 from St. Louis to Kos, returning Fri, Jul 17, priced at $1,471 found 6 days ago
Air Canada
Tue, Jun 30 - Fri, Jul 17
STL
St. Louis
KGS
Kos
$1,472 Roundtrip, found 6 days ago
$1,472
Roundtrip
found 6 days ago
Select Air Canada flight, departing Tue, Jun 30 from St. Louis to Kos, returning Fri, Jul 17, priced at $1,472 found 6 days ago
United
Tue, Jun 30 - Fri, Jul 17
STL
St. Louis
KGS
Kos
$1,475 Roundtrip, found 6 days ago
$1,475
Roundtrip
found 6 days ago
Select United flight, departing Tue, Jun 30 from St. Louis to Kos, returning Fri, Jul 17, priced at $1,475 found 6 days ago
United
Tue, Jun 30 - Fri, Jul 17
STL
St. Louis
KGS
Kos
$1,477 Roundtrip, found 6 days ago
$1,477
Roundtrip
found 6 days ago
Select United flight, departing Tue, Jun 30 from St. Louis to Kos, returning Fri, Jul 17, priced at $1,477 found 6 days ago
Air Canada
Tue, Jun 30 - Fri, Jul 17
STL
St. Louis
KGS
Kos
$1,477 Roundtrip, found 6 days ago
$1,477
Roundtrip
found 6 days ago
Select Air Canada flight, departing Tue, Jun 30 from St. Louis to Kos, returning Fri, Jul 17, priced at $1,477 found 6 days ago
Lufthansa
Tue, Jun 30 - Wed, Jul 15
STL
St. Louis
KGS
Kos
$1,563 Roundtrip, found 2 days ago
$1,563
Roundtrip
found 2 days ago
Select Lufthansa flight, departing Tue, Jun 30 from St. Louis to Kos, returning Wed, Jul 15, priced at $1,563 found 2 days ago
Austrian Airlines
Tue, Jun 30 - Wed, Jul 15
STL
St. Louis
KGS
Kos
$1,708 Roundtrip, found 2 days ago
$1,708
Roundtrip
found 2 days ago
Select Austrian Airlines flight, departing Tue, Jun 30 from St. Louis to Kos, returning Wed, Jul 15, priced at $1,708 found 2 days ago
British Airways
Tue, Jun 30 - Wed, Jul 15
STL
St. Louis
KGS
Kos
$1,721 Roundtrip, found 2 days ago
$1,721
Roundtrip
found 2 days ago
Select British Airways flight, departing Tue, Jun 30 from St. Louis to Kos, returning Wed, Jul 15, priced at $1,721 found 2 days ago

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS) cost?
Lock in a cheap one-way flight from $1,010 or cheap return flight from $1,465 from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS)?
Flying in June can help you save, as it's the cheapest month for flights between STL and KGS. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS)?
To find the cheapest airline that'll fly you from STL to KGS, use Expedia's filter tool. Customize your search based on what's important to you, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS)?
Nonstop flights from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to KGS?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can change based on a range of factors, such as the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS)?
To avoid possible delays on the Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS) route, travel before 3 PM. Flights after this time have a 22% higher chance of being canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS) last-minute?
Waiting until just before your trip to book a flight from STL to KGS generally means paying more. While you might find some last-minute deals, they're not always guaranteed. Keep your travel plans flexible for the best chance of scoring a bargain.
Is it cheaper to book a STL to KGS flight and hotel package?
Securing a STL to KGS flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your travels in one place. Select from our extensive range of stays and then add car rentals, activities and flights to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Kos Island Intl. Airport (KGS)?
It's generally possible to reschedule or cancel your STL to KGS flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Kos Island Intl.
Roundtrip price
$1,464
Distance
5873 mi

Book with confidence

St. Louis to Kos Flights

The cheapest times to fly from St. Louis to Kos

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Kos are during the month of June. You can find some of the cheapest flights from St. Louis to Kos with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Kos

Sunday is one of the best days to book for cheap flights from St. Louis to Kos: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Kos

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Kos in 2025. You can also book with separate airlines for your outbound and return journeys, from $1,010 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Kos flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Kos airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Kos Flights

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*Available to One Key members.