$148 Cheap Flights from Oslo (OSL) to Kos (KGS)

View $148 flight on Wed, Aug 13, 2025Opens in a new window

Popular airlines from Gardermoen Airport (OSL) to Kos (KGS-Kos Island Intl.)

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Cheap Flights from Oslo to Kos (OSL-KGS)

Prices were available within the past 7 days and start at $148 for one-way flights and $395 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$395 Roundtrip, found 5 days ago
$395
Roundtrip
found 5 days ago
Select Swiss International Air Lines flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $395 found 5 days ago
Aegean
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$406 Roundtrip, found 5 days ago
$406
Roundtrip
found 5 days ago
Select Aegean flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $406 found 5 days ago
Brussels Airlines
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$409 Roundtrip, found 5 days ago
$409
Roundtrip
found 5 days ago
Select Brussels Airlines flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $409 found 5 days ago
Lufthansa
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$433 Roundtrip, found 5 days ago
$433
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $433 found 5 days ago
Swiss International Air Lines
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$462 Roundtrip, found 5 days ago
$462
Roundtrip
found 5 days ago
Select Swiss International Air Lines flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $462 found 5 days ago
Lufthansa
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$500 Roundtrip, found 5 days ago
$500
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $500 found 5 days ago
Swiss International Air Lines
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$512 Roundtrip, found 5 days ago
$512
Roundtrip
found 5 days ago
Select Swiss International Air Lines flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $512 found 5 days ago
Lufthansa
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$512 Roundtrip, found 5 days ago
$512
Roundtrip
found 5 days ago
Select Lufthansa flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $512 found 5 days ago
Brussels Airlines
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$524 Roundtrip, found 5 days ago
$524
Roundtrip
found 5 days ago
Select Brussels Airlines flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $524 found 5 days ago
Swiss International Air Lines
Wed, Aug 13 - Mon, Aug 18
OSL
Oslo
KGS
Kos
$529 Roundtrip, found 5 days ago
$529
Roundtrip
found 5 days ago
Select Swiss International Air Lines flight, departing Wed, Aug 13 from Oslo to Kos, returning Mon, Aug 18, priced at $529 found 5 days ago
Flights from Oslo (OSL) to Kos (KGS)
Origin airport
Gardermoen
Destination airport
Kos Island Intl.
Roundtrip price
$395
Distance
1763 mi

Oslo to Kos Flights

The cheapest times to fly from Oslo 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 Oslo to Kos are during the month of August. You can find some of the cheapest flights from Oslo to Kos with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Oslo to Kos

Sunday is one of the best days to book for cheap flights from Oslo 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 Oslo 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 Oslo to Kos in 2025. You can also book with separate airlines for your outbound and return journeys, from $148 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 Oslo 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 Oslo 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.

 

Frequently asked questions

How much does a flight from Gardermoen Airport (OSL) to Kos Island Intl. Airport (KGS) cost?
Discover the latest flight deals from OSL to KGS by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from OSL to KGS?
The cheapest flights from OSL to KGS are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from OSL to KGS?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from OSL to KGS. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Gardermoen Airport (OSL) to Kos Island Intl. Airport (KGS)?
You'll have to take a flight with a layover when traveling from Gardermoen Airport (OSL) to Kos Island Intl. Airport (KGS). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from OSL to KGS?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change depending on a range of factors, including the airline and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Gardermoen Airport (OSL) to Kos Island Intl. Airport (KGS)?
To arrive at Kos Island Intl. Airport (KGS) on schedule, select a flight that leaves from Gardermoen Airport (OSL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**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 Gardermoen Airport (OSL) to Kos Island Intl. Airport (KGS) last-minute?
Holding off until just before your trip to book a flight from OSL to KGS generally means paying more. While you may come across some last-minute deals, there's no guarantee. Keep your travel schedule open for a better chance of getting a bargain.
Is it cheaper to book an OSL to KGS flight and hotel package?
You can save money by booking an OSL to KGS flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. Once you've chosen your ideal accommodations and flights, you can add extras like activities, car rentals and tours.
Can I cancel or change the date of my flight from Gardermoen Airport (OSL) to Kos Island Intl. Airport (KGS)?
In most cases, you can cancel or reschedule your OSL to KGS flight. However, there may be additional charges, especially if you made your booking more than 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you'd like further information, go to our Customer Service portal.

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*Available to One Key members.