Cheapest return flights from Athens to Sofia in September from $138

Best time to book flights for Athens (ATH) to Sofia (SOF) flights at AirHint

AirHint found the following cheapest return flights from Athens (ATH) to Sofia (SOF) in September 2025 (see full year).

Return flights

18 Sep - 22 Sep SKY express direct
12 Sep - 22 Sep SKY express direct
12 Sep - 14 Sep SKY express direct
11 Sep - 14 Sep Bulgaria Air direct
27 Sep - 04 Oct Aegean Airlines direct
11 Sep - 22 Sep SKY express direct
18 Sep - 02 Oct SKY express direct
12 Sep - 02 Oct SKY express direct
08 Sep - 22 Sep SKY express direct
08 Sep - 14 Sep SKY express direct
08 Sep - 10 Sep SKY express direct
08 Sep - 11 Sep SKY express direct

Also check the deals for one-way flights from Athens to Sofia in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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