Cheap Flights from Kos to Sofia from $247

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Flight deals from Kos Airport to Sofia Airport

Looking for a cheap last-minute deal or the best return flight from Kos Airport to Sofia Airport? If you want to travel next month, return fares start from $247. Find the lowest prices on one-way and return tickets right here.

Sofia.$247 per passenger.Departing Sat, 11 Apr, returning Mon, 13 Apr.Return flight with Aegean Airlines.Outbound indirect flight with Aegean Airlines, departs from Kos on Sat, 11 Apr, arriving in Sofia.Inbound indirect flight with Aegean Airlines, departs from Sofia on Mon, 13 Apr, arriving in Kos.Price includes taxes and charges.From $247, select.

Sofia.$378 per passenger.Departing Fri, 19 Jun, returning Sun, 21 Jun.Return flight with Aegean Airlines.Outbound indirect flight with Aegean Airlines, departs from Kos on Fri, 19 Jun, arriving in Sofia.Inbound indirect flight with Aegean Airlines, departs from Sofia on Sun, 21 Jun, arriving in Kos.Price includes taxes and charges.From $378, select.

Sofia.$548 per passenger.Departing Mon, 24 Aug, returning Sun, 30 Aug.Return flight with Aegean Airlines.Outbound indirect flight with Aegean Airlines, departs from Kos on Mon, 24 Aug, arriving in Sofia.Inbound indirect flight with Aegean Airlines, departs from Sofia on Sun, 30 Aug, arriving in Kos.Price includes taxes and charges.From $548, select.

Sofia.$582 per passenger.Departing Sun, 26 Apr, returning Wed, 6 May.Return flight with SKY express.Outbound indirect flight with SKY express, departs from Kos on Sun, 26 Apr, arriving in Sofia.Inbound indirect flight with SKY express, departs from Sofia on Wed, 6 May, arriving in Kos.Price includes taxes and charges.From $582, select.

Sofia.$591 per passenger.Departing Mon, 20 Jul, returning Sun, 26 Jul.Return flight with Aegean Airlines.Outbound indirect flight with Aegean Airlines, departs from Kos on Mon, 20 Jul, arriving in Sofia.Inbound indirect flight with Aegean Airlines, departs from Sofia on Sun, 26 Jul, arriving in Kos.Price includes taxes and charges.From $591, select.

Sofia.$817 per passenger.Departing Sun, 22 Mar, returning Wed, 8 Apr.Return flight with SKY express.Outbound indirect flight with SKY express, departs from Kos on Sun, 22 Mar, arriving in Sofia.Inbound indirect flight with SKY express, departs from Sofia on Wed, 8 Apr, arriving in Kos.Price includes taxes and charges.From $817, select.

Find the cheapest month to fly from Kos to Sofia

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Kos to Sofia flights are currently cheapest in April.

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Kos to Sofia: Alternative routes

Compare routes from Kos to Sofia below. You may find an airport to fly into that's cheaper, faster, or easier than Sofia.

Sofia

7km from central Sofia

ClosestCheapest

from $247

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Kos to Sofia: Flight information

The things to know before you go.

Cheapest flight found	$247
Cheapest month to fly	April

Check out these Sofia hotels

Ready to plan your stay? Other travellers rate these Sofia hotels for cleanliness, service and location.

Central West Hotel

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Blue Star Luxury Hotel

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Aurora Sofia

1.66 km from city centre

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Central West Hotel

2.01 km from city centre

$132

Per night

Blue Star Luxury Hotel

4.55 km from city centre

$173

Per night

Aurora Sofia

1.66 km from city centre

$151

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Finding cheap flights from Kos to Sofia: Frequently asked questions

How much are return flights from Kos to Sofia?

The best price we found for a return flight from Kos to Sofia is $247. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Which airlines fly direct from Kos to Sofia?

Currently, there are no airlines that fly direct from Kos to Sofia. But we found flights with one or more stops from $247.

How many flights are there a week from Kos to Sofia?

As of March 2026, there are no flights flying from Kos to Sofia.

When is the cheapest time to fly from Kos to Sofia?

The cheapest month to fly from Kos to Sofia is usually April.

Which upcoming date is cheapest to fly from Kos Airport to Sofia Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Kos Airport to Sofia Airport on Saturday, 11 April 2026.

Can I get a direct flight from Kos Airport to Sofia Airport?

No airlines currently offer direct flights between Kos Airport and Sofia Airport. Most routes have one or more stops.

How can I find the best flight deal to Sofia?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Sofia but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Sofia?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Sofia is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Kos Airport to Sofia with?

Currently, Aegean Airlines offers the cheapest flight tickets to Sofia.

Flying from Kos Airport (KGS) to Sofia Airport (SOF): what you need to know

Give yourself enough time to catch your KGS to SOF flight. A good rule of thumb is to arrive at least two hours before international departures and an hour ahead for domestic flights.
During popular months such as August, you'll want to get to the airport earlier than normal. Plan to arrive two hours before domestic departures and four hours ahead of international flights when you fly during a peak period in general.
We make it a cinch to book a flight with a stopover. To see all your options for tickets from Kos Airport to Sofia Airport, uncheck 'Direct flights only.' Then, choose a flight that has a stop long enough to explore your chosen city. Top stopovers between KGS and SOF include:
- Eleftherios Venizelos International Airport
- Vienna International Airport
- Berlin Brandenburg Airport

How to find the cheapest flights from Kos Airport (KGS) to Sofia Airport (SOF)

$129 is currently the lowest price for a one-way Kos Airport to Sofia Airport flight. A return flight starts at $247. These fares can change based on availability and demand.
To pick up cheap tickets from KGS to SOF, book in advance. Airlines typically offer lower prices when flights are first released.
If you're flexible with your trip dates, try using the 'Whole month' tool. It'll show you the cheapest price across the month when looking for a flight from Kos Airport to Sofia Airport.
Never miss a deal on cheap flights from KGS to SOF by creating a Price Alert. We'll send you an email or notification through the app when a special offer becomes available.
Pick your ideal arrival and departure times, number of stops and airlines with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from Kos Airport to Sofia Airport.

Handy information about Kos Airport (KGS)

Kos Airport scores high marks for on-time performance. 89.58% of flights that depart KGS arrive at their destination as scheduled.

Arriving at Sofia Airport (SOF)

If you're coming in on a late Kos Airport to Sofia Airport flight, few things beat the convenience of being near the terminal. Grab your bags from the carousel and then be showered and relaxing not long after at one of these hotels near SOF:
Go where the road takes you with a Sofia Airport rental car. Pick up your wheels from MEX, Surprice or NU Car Rentals and discover more of Sofia and beyond.
Lock in the best deal by reserving your ride from Sofia Airport around one week in advance of your trip.

Getting from Sofia Airport (SOF) to central Sofia

From Sofia Airport, Sofia is approximately 11 kilometres away. It takes around 15 minutes to reach the centre driving.
Getting there on public transport will take you around 35 minutes.

When to fly to Sofia Airport (SOF)

It's time to pick your trip dates for your flight from Kos Airport to Sofia Airport. August is the busiest month to visit Sofia. If you'd like a more low-key vibe, go in April.
The warmest month in Sofia is August, with temperatures ranging between 14ºC and 30ºC. Lock in your flights from Kos Airport to Sofia Airport in this month if this is the type of weather you like.
Search for cheap tickets from KGS to SOF in January if you like cooler conditions. Temperatures are at their lowest around then, ranging between -11ºC and 7ºC on average.

Explore more of Bulgaria

You've seen Sofia, now it's time to discover other corners of Bulgaria. Journey about 129 kilometres south-east to Plovdiv to check off its top sights. From Plovdiv Old Town to Plovdiv Roman Theatre and Archaelogical Complex Nebet Tepe, you've got a jam-packed schedule ahead.
If you're ready to explore another well-known destination in Bulgaria, consider Varna, roughly 386 kilometres east of Sofia. Park Asparuhovo - Asparuhovo sea garden, Dormition of theotokos Cathedral and Sunset viewpoint (място за гледане на Залеза) are key reasons to visit.