$80 Cheap Flights from Sofia (SOF) to Kos (KGS)

View $80 flight on Fri, Dec 12, 2025Opens in a new window

Popular airlines from Sofia Airport (SOF) to Kos (KGS-Kos Island Intl.)

Cheap Flights from Sofia to Kos (SOF-KGS)

Prices were available within the past 7 days and start at $80 for one-way flights and $165 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Aegean
Fri, Dec 12 - Sun, Dec 14
SOF
Sofia
KGS
Kos
$165 Roundtrip, found 3 days ago
$165
Roundtrip
found 3 days ago
Select Aegean flight, departing Fri, Dec 12 from Sofia to Kos, returning Sun, Dec 14, priced at $165 found 3 days ago
Aegean
Mon, Apr 20 - Fri, Apr 24
SOF
Sofia
KGS
Kos
$169 Roundtrip, found 6 days ago
$169
Roundtrip
found 6 days ago
Select Aegean flight, departing Mon, Apr 20 from Sofia to Kos, returning Fri, Apr 24, priced at $169 found 6 days ago
Aegean
Mon, Apr 20 - Fri, Apr 24
SOF
Sofia
KGS
Kos
$179 Roundtrip, found 6 days ago
$179
Roundtrip
found 6 days ago
Select Aegean flight, departing Mon, Apr 20 from Sofia to Kos, returning Fri, Apr 24, priced at $179 found 6 days ago
Aegean
Mon, Apr 20 - Fri, Apr 24
SOF
Sofia
KGS
Kos
$191 Roundtrip, found 6 days ago
$191
Roundtrip
found 6 days ago
Select Aegean flight, departing Mon, Apr 20 from Sofia to Kos, returning Fri, Apr 24, priced at $191 found 6 days ago
Aegean
Fri, Dec 12 - Sun, Dec 14
SOF
Sofia
KGS
Kos
$193 Roundtrip, found 3 days ago
$193
Roundtrip
found 3 days ago
Select Aegean flight, departing Fri, Dec 12 from Sofia to Kos, returning Sun, Dec 14, priced at $193 found 3 days ago
Aegean
Mon, Apr 20 - Fri, Apr 24
SOF
Sofia
KGS
Kos
$196 Roundtrip, found 6 days ago
$196
Roundtrip
found 6 days ago
Select Aegean flight, departing Mon, Apr 20 from Sofia to Kos, returning Fri, Apr 24, priced at $196 found 6 days ago
Aegean
Mon, Apr 27 - Thu, Apr 30
SOF
Sofia
KGS
Kos
$200 Roundtrip, found 6 days ago
$200
Roundtrip
found 6 days ago
Select Aegean flight, departing Mon, Apr 27 from Sofia to Kos, returning Thu, Apr 30, priced at $200 found 6 days ago
Aegean
Fri, Dec 12 - Sun, Dec 14
SOF
Sofia
KGS
Kos
$201 Roundtrip, found 3 days ago
$201
Roundtrip
found 3 days ago
Select Aegean flight, departing Fri, Dec 12 from Sofia to Kos, returning Sun, Dec 14, priced at $201 found 3 days ago
Aegean
Mon, Apr 27 - Thu, Apr 30
SOF
Sofia
KGS
Kos
$204 Roundtrip, found 6 days ago
$204
Roundtrip
found 6 days ago
Select Aegean flight, departing Mon, Apr 27 from Sofia to Kos, returning Thu, Apr 30, priced at $204 found 6 days ago
SKY express
Mon, Apr 27 - Fri, May 1
SOF
Sofia
KGS
Kos
$233 Roundtrip, found 6 days ago
$233
Roundtrip
found 6 days ago
Select SKY express flight, departing Mon, Apr 27 from Sofia to Kos, returning Fri, May 1, priced at $233 found 6 days ago

Frequently asked questions

How much does a flight from Sofia Airport (SOF) to Kos Island Intl. Airport (KGS) cost?
Snag a cheap one-way flight from $80 or cheap return flight from $165 from Sofia Airport (SOF) to Kos Island Intl. Airport (KGS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Sofia Airport (SOF) to Kos Island Intl. Airport (KGS)?
The cheapest month to fly from SOF to KGS is December, when there's less demand. Off-peak months are typically when airlines offer better prices between these airports.
What is the cheapest airline that flies from Sofia Airport (SOF) to Kos Island Intl. Airport (KGS)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest SOF to KGS flight.
How many flights per day from Sofia Airport (SOF) to Kos Island Intl. Airport (KGS)?
You'll have to catch a flight with a layover when traveling from Sofia Airport (SOF) to Kos Island Intl. Airport (KGS). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from SOF to KGS?
Friday is typically the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can change depending on a range of factors, such as the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sofia Airport (SOF) to Kos Island Intl. Airport (KGS)?
To avoid potential delays on the Sofia Airport (SOF) to Kos Island Intl. Airport (KGS) route, fly 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 Sofia Airport (SOF) to Kos Island Intl. Airport (KGS) last-minute?
Booking your ticket from SOF to KGS right before your trip is usually more expensive. But if there's some wiggle room with your travel times and dates, you could grab a cheap last-minute fare.
Is it cheaper to book a SOF to KGS flight and hotel package?
Compared with arranging hotels and flights separately, booking a SOF to KGS flight and hotel package with Expedia could result in significant savings. What's more, having everything in one place will take the hassle out of travel planning. Simply secure your flights and select from our wide range of hotels, then personalize your trip with extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Sofia Airport (SOF) to Kos Island Intl. Airport (KGS)?
Usually, it's possible to cancel or reschedule your SOF to KGS flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Origin airport
Sofia
Destination airport
Kos Island Intl.
Roundtrip price
$165
Distance
451 mi

Book with confidence

Sofia to Kos Flights

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

 

The best time to book a flight from Sofia to Kos

Sunday is one of the best days to book for cheap flights from Sofia 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 Sofia 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 Sofia to Kos in 2025. You can also book with separate airlines for your outbound and return journeys, from $80 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 Sofia 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 Sofia 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.

 

Sofia to Kos Flights

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*Available to One Key members.