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

Return flights

17 Sep - 22 Sep	easyJet
20 Sep - 13 Oct	easyJet
19 Sep - 22 Sep	easyJet
10 Sep - 17 Sep	easyJet
13 Sep - 20 Sep	easyJet
25 Sep - 02 Oct	transavia
13 Sep - 17 Sep	easyJet
25 Sep - 10 Oct	easyJet
13 Sep - 11 Oct	easyJet
18 Sep - 04 Oct	easyJet
30 Sep - 02 Oct	Ryanair
22 Sep - 03 Oct	easyJet
05 Sep - 12 Sep	easyJet
01 Sep - 04 Oct	Air Serbia
02 Sep - 07 Sep	Ryanair
03 Sep - 07 Sep	Air Serbia
09 Sep - 19 Sep	easyJet
27 Sep - 29 Sep	transavia
26 Sep - 05 Oct	Air Serbia

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 173€

Return flights