AirHint found the following cheapest return flights from Thessaloniki (SKG) to Belgrade (BEG) in September 2025 (see full year).

Return flights

25 Sep - 29 Sep	Air Serbia	direct
29 Sep - 03 Oct	Ryanair
24 Sep - 29 Sep	Ryanair
20 Sep - 22 Sep	Ryanair
18 Sep - 24 Sep	Air Serbia	direct
29 Sep - 06 Oct	Air Serbia	direct
17 Sep - 19 Sep	Ryanair
25 Sep - 28 Sep	Air Serbia	direct
27 Sep - 29 Sep	Ryanair
27 Sep - 01 Oct	Ryanair
29 Sep - 04 Oct	Ryanair
24 Sep - 28 Sep	Ryanair
27 Sep - 28 Sep	Ryanair
26 Sep - 29 Sep	Ryanair
26 Sep - 01 Oct	Ryanair
26 Sep - 06 Oct	Ryanair
30 Sep - 07 Oct	Ryanair
26 Sep - 01 Oct	Air Serbia	direct

Also check the deals for one-way flights from Thessaloniki to Belgrade 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 Thessaloniki to Belgrade in September from $169

Return flights