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

Return flights

16 Sep - 23 Sep	easyJet
23 Sep - 30 Sep	easyJet
29 Sep - 03 Oct	easyJet
18 Sep - 25 Sep	AJet
18 Sep - 23 Sep	AJet
15 Sep - 16 Sep	easyJet
20 Sep - 23 Sep	Air Serbia
20 Sep - 25 Sep	Air Serbia
30 Sep - 05 Oct	easyJet
20 Sep - 27 Sep	Air Serbia
30 Sep - 07 Oct	easyJet
17 Sep - 23 Sep	easyJet
18 Sep - 24 Sep	AJet
26 Sep - 03 Oct	Bulgaria Air
28 Sep - 03 Oct	Bulgaria Air
27 Sep - 04 Oct	easyJet
28 Sep - 11 Oct	Bulgaria Air
27 Sep - 11 Oct	easyJet

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

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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Cheapest return flights from Zurich to Sofia in September from $180

Return flights