Cheap Flights from Kos to Sofia from €69

Frequently Asked Questions

• What are the cheapest flights from Kos to Sofia (KGS-SOF)?

  Based on Trip.com data, AEGEAN offers one-way fares as low as €69 on Cheapest nonstop routes (e.g. KGS to SOF on Mon, Apr 20), while AEGEAN offers Cheapest nonstop round-trips from €131 departing on Mon, Mar 16 and returning on Fri, Mar 20.

• Which airlines offer direct flights from Kos to Sofia?

  At the moment, you can catch a nonstop flight from Kos to Sofia with the following airlines, including: SKY express Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• When is the best time to book flights from Kos to Sofia?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Kos to Sofia is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How can I find the best deals on flights from Kos to Sofia?

  To find best deals on flights from Kos to Sofia, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Mon, Apr 20, with one-way flights priced at just €69.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is AEGEAN.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Sofia travel is around August.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from Kos (KGS) to Sofia (SOF) the cheapest?

  The cheapest months to fly from Kos to Sofia is November, when demand for travel is lower.

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

  After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Kos to Sofia on March 20, 2026 with AEGEAN, with prices starting at €75.

• Which airports can I fly to for Sofia from Kos?

  You can land at any one of the following hubs in Sofia, with Kos Airport to Sofia International Airport (KGS-SOF) is by far the most common option on this route: Sofia International Airport (SOF).

• Is there any time difference between Kos and Sofia?

  The time difference between Sofia and Kos is 0h.

• How do I change or cancel my ticket from Kos to Sofia?

  Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.