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Flights from Sofia to Kos

Find the cheapest flight options from Sofia to Kos over the next three months. Book one-way tickets from €65 and round-trip tickets from €128.

      • SOF 20:20
        20h 45m
        1 stop
        KGS 17:05
        Sofia - Kos | Thu, Mar 19 | AEGEAN
        KGS 17:35
        16h 50m
        1 stop
        SOF 10:25
        Kos - Sofia | Sun, Mar 22 | AEGEAN
        €128 €193
        34% off
        34% off
        €193 €128
      • SOF 21:20
        11h 30m
        1 stop
        KGS 08:50
        Sofia - Kos | Fri, Apr 10 | AEGEAN
        KGS 06:00
        4h 5m
        1 stop
        SOF 10:05
        Kos - Sofia | Fri, Apr 17 | AEGEAN
        €132 €193
        32% off
        32% off
        €193 €132
      • SOF 10:55
        13h 40m
        1 stop
        KGS 00:35
        Sofia - Kos | Fri, Apr 17 | AEGEAN
        KGS 06:00
        4h 5m
        1 stop
        SOF 10:05
        Kos - Sofia | Fri, Apr 24 | AEGEAN
        €134 €193
        31% off
        31% off
        €193 €134
      • SOF 20:20
        11h 45m
        1 stop
        KGS 08:05
        Sofia - Kos | Fri, Mar 20 | AEGEAN
        KGS 21:05
        17h 30m
        1 stop
        SOF 14:35
        Kos - Sofia | Fri, Mar 27 | AEGEAN
        €152
        21% off
        €193 €152
      • SOF 20:20
        19h 50m
        1 stop
        KGS 16:10
        Sofia - Kos | Fri, Mar 27 | AEGEAN
        KGS 09:20
        24h 35m
        1 stop
        SOF 09:55
        Kos - Sofia | Tue, Mar 31 | AEGEAN
        €155
        20% off
        €193 €155
      • SOF 17:15
        20h 35m
        1 stop
        KGS 13:50
        Sofia - Kos | Sat, Mar 21 | AEGEAN
        KGS 08:35
        6h
        1 stop
        SOF 14:35
        Kos - Sofia | Sat, Mar 28 | AEGEAN
        €158
        18% off
        €193 €158
      • SOF 21:30
        20h 5m
        1 stop
        KGS 17:35
        Sofia - Kos | Mon, Apr 20 | AEGEAN
        KGS 13:05
        7h 25m
        1 stop
        SOF 20:30
        Kos - Sofia | Mon, Apr 27 | AEGEAN
        €160
        17% off
        €193 €160
      • SOF 16:45
        7h 50m
        1 stop
        KGS 00:35
        Sofia - Kos | Sat, Apr 4 | AEGEAN
        KGS 06:00
        4h
        1 stop
        SOF 10:00
        Kos - Sofia | Sat, Apr 11 | AEGEAN
        €163
        16% off
        €193 €163
      • SOF 21:20
        20h 15m
        1 stop
        KGS 17:35
        Sofia - Kos | Sun, Apr 5 | AEGEAN
        KGS 06:00
        14h 30m
        1 stop
        SOF 20:30
        Kos - Sofia | Sun, Apr 12 | AEGEAN
        €164
        15% off
        €193 €164
      • SOF 11:15
        4h 55m
        1 stop
        KGS 16:10
        Sofia - Kos | Mon, Mar 23 | AEGEAN
        KGS 09:20
        11h 10m
        1 stop
        SOF 20:30
        Kos - Sofia | Sun, Mar 29 | AEGEAN
        €169
        12% off
        €193 €169
      • SOF 13:00
        17h 25m
        1 stop
        KGS Invalid Date
        Sofia - Kos | Sat, Mar 21 | Normal Airline
        KGS 15:00
        6h
        Direct
        SOF 16:00
        Kos - Sofia | Mon, Mar 23 | Normal Airline
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      • SOF 10:55
        13h 40m
        1 stop
        KGS 00:35
        Sofia - Kos | Fri, Apr 17 | AEGEAN
        €65 €94
        31% off
        31% off
        €94 €65
      • SOF 17:40
        6h 55m
        1 stop
        KGS 00:35
        Sofia - Kos | Sat, Apr 18 | AEGEAN
        €71 €94
        24% off
        24% off
        €94 €71
      • SOF 10:55
        6h 40m
        1 stop
        KGS 17:35
        Sofia - Kos | Tue, Apr 21 | AEGEAN
        €71 €94
        24% off
        24% off
        €94 €71
      • SOF 10:55
        13h 40m
        1 stop
        KGS 00:35
        Sofia - Kos | Fri, Apr 10 | AEGEAN
        €74
        21% off
        €94 €74
      • SOF 10:45
        25h 50m
        1 stop
        KGS 12:35
        Sofia - Kos | Wed, Apr 15 | AEGEAN
        €75
        20% off
        €94 €75
      • SOF 10:55
        21h 55m
        1 stop
        KGS 08:50
        Sofia - Kos | Tue, Apr 14 | AEGEAN
        €75
        20% off
        €94 €75
      • SOF 10:45
        13h 50m
        1 stop
        KGS 00:35
        Sofia - Kos | Wed, Apr 22 | AEGEAN
        €76
        19% off
        €94 €76
      • SOF 16:40
        7h 55m
        1 stop
        KGS 00:35
        Sofia - Kos | Sat, Apr 11 | AEGEAN
        €78
        17% off
        €94 €78
      • SOF 21:20
        3h 15m
        1 stop
        KGS 00:35
        Sofia - Kos | Mon, Apr 27 | AEGEAN
        €81
        14% off
        €94 €81
      • SOF 21:20
        20h 15m
        1 stop
        KGS 17:35
        Sofia - Kos | Sun, Apr 5 | AEGEAN
        €82
        13% off
        €94 €82
      • SOF 13:00
        17h 25m
        1 stop
        KGS Invalid Date
        Sofia - Kos | Sat, Mar 21 | Normal Airline
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Displayed flight fares from Sofia to Kos are based on average prices across airlines for the next 3 months, according to the latest Trip.com database.

Flight details for Sofia to Kos

The distance between Sofia and Kos is 727.8 km. Based on Trip.com's data, travel demand peaks in July. The off-season for travel is November.

Cheapest one-way flight price€65
Cheapest round-trip ticket price€128
Off-season for travelNovember
Peak season for travelJuly
Flight distance727.8 km
Flight statistics for the Sofia–Kos route are based on aggregated booking data from Trip.com over the past 12 months.

Flight FAQs

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

    Based on Trip.com data, AEGEAN offers one-way fares as low as €65 on Cheapest nonstop routes (e.g. SOF to KGS on Fri, Apr 17), while AEGEAN offers Cheapest nonstop round-trips from €128 departing on Thu, Mar 19 and returning on Sun, Mar 22.
  • By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Sofia to Kos 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.
  • To find best deals on flights from Sofia to Kos, 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 Fri, Apr 17, with one-way flights priced at just €65.
    · 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 Kos travel is around July.
    · Get exclusive promo codes for Trip.com app users.
  • The cheapest months to fly from Sofia to Kos is November, when demand for travel is lower.
  • After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Sofia to Kos on March 19, 2026 with AEGEAN, with prices starting at €128.
  • The time difference between Kos and Sofia is 0h.
  • 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.