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

Return flights

29 Sep - 06 Oct	easyJet
07 Sep - 07 Oct	easyJet
06 Sep - 11 Sep	Ryanair
09 Sep - 15 Oct	easyJet
16 Sep - 15 Oct	easyJet
06 Sep - 13 Sep	Ryanair
17 Sep - 30 Sep	Ryanair
09 Sep - 08 Oct	Ryanair
20 Sep - 22 Sep	Ryanair
13 Sep - 20 Sep	Ryanair
08 Sep - 11 Sep	easyJet
09 Sep - 13 Sep	Ryanair
17 Sep - 22 Oct	Ryanair
29 Sep - 01 Oct	easyJet
04 Sep - 20 Sep	Ryanair
30 Sep - 03 Oct	Ryanair
03 Sep - 08 Oct	easyJet
17 Sep - 21 Sep	easyJet
15 Sep - 17 Sep	easyJet
26 Sep - 05 Oct	easyJet

Also check the deals for one-way flights from Amsterdam 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 Amsterdam to Sofia in September from 154€

Return flights