AirHint found the following cheapest return flights from London (STN) to Belgrade (BEG) in December 2025 (see full year).

Return flights

11 Dec - 14 Dec	Pegasus Airlines
11 Dec - 11 Jan	Pegasus Airlines
06 Dec - 11 Jan	Pegasus Airlines
04 Dec - 07 Dec	Pegasus Airlines
05 Dec - 08 Dec	Ryanair
12 Dec - 16 Dec	Ryanair
13 Dec - 11 Jan	Ryanair
19 Dec - 11 Jan	Ryanair
20 Dec - 11 Jan	Ryanair
27 Dec - 01 Jan	Ryanair
27 Dec - 04 Jan	Ryanair
23 Dec - 31 Dec	Ryanair

Also check the deals for one-way flights from London to Belgrade in December.

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 London to Belgrade in December from $190

Return flights