Cheap Flights from Sion (SIR) to Kos (KGS)

Popular airlines from Sion (SIR) to Kos (KGS-Kos Island Intl.)

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Frequently asked questions

How much does a flight from Sion Airport (SIR) to Kos Island Intl. Airport (KGS) cost?
Grab a cheap one-way flight or cheap return flight from Sion Airport (SIR) to Kos Island Intl. Airport (KGS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Sion Airport (SIR) to Kos Island Intl. Airport (KGS)?
Traveling in is a great way to save, as it's the cheapest month for flights between SIR and KGS. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from Sion Airport (SIR) to Kos Island Intl. Airport (KGS)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest SIR to KGS flight.
How many flights per day from Sion Airport (SIR) to Kos Island Intl. Airport (KGS)?
Direct flights from Sion Airport (SIR) to Kos Island Intl. Airport (KGS) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SIR to KGS?
Typically you'll find the widest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can change depending on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sion Airport (SIR) to Kos Island Intl. Airport (KGS)?
Choose a flight from Sion Airport (SIR) to Kos Island Intl. Airport (KGS) that takes off before 3 PM to reduce the risk of cancellations. Departures after this hour have a 22% higher chance of being canceled, on average.**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 Sion Airport (SIR) to Kos Island Intl. Airport (KGS) last-minute?
Waiting until just before your departure to book a ticket from SIR to KGS generally means paying more. While it's possible to find some last-minute offers, there's no guarantee. Allow some flexibility in your schedule for a better chance of getting a bargain.
Is it cheaper to book a SIR to KGS flight and hotel package?
Compared with arranging hotels and flights separately, booking a SIR to KGS flight and hotel package with Expedia could result in significant savings. What's more, having everything in one easy place will take the hassle out of planning your trip. Simply secure your flights and select from our wide range of stays, then tailor your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Sion Airport (SIR) to Kos Island Intl. Airport (KGS)?
It's generally possible to cancel or reschedule your SIR to KGS flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Sion
Destination airport
Kos Island Intl.
Distance
1206 mi

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Sion to Kos Flights

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

 

The best time to book a flight from Sion to Kos

Sunday is one of the best days to book for cheap flights from Sion 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 Sion 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 Sion to Kos in 2026. You can also book with separate airlines for your outbound and return journeys, from 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 Sion 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 Sion 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.

 

Sion to Kos Flights

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*Available to One Key members.