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

Return flights

24 Sep - 02 Oct	Ryanair
25 Sep - 29 Sep	easyJet
09 Sep - 08 Oct	Ryanair
15 Sep - 15 Oct	easyJet
24 Sep - 08 Oct	easyJet
26 Sep - 29 Sep	easyJet
09 Sep - 13 Sep	Ryanair
10 Sep - 15 Oct	Ryanair
09 Sep - 17 Sep	Ryanair
16 Sep - 15 Oct	Ryanair
07 Sep - 07 Oct	easyJet
10 Sep - 13 Sep	Ryanair
20 Sep - 27 Sep	Ryanair
15 Sep - 23 Sep	easyJet
13 Sep - 15 Sep	Ryanair
28 Sep - 01 Oct	easyJet
23 Sep - 30 Sep	easyJet
16 Sep - 18 Sep	Ryanair
15 Sep - 03 Oct	easyJet
22 Sep - 03 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 $192

Return flights