AirHint found the following cheapest return flights from London (LHR) to Sylhet Osmani (ZYL) in December 2025 (see full year).

Return flights

10 Dec - 25 Dec	Scandinavian Airlines
31 Dec - 29 Jan	Saudia
31 Dec - 21 Jan	Saudia
31 Dec - 14 Jan	Saudia
14 Dec - 20 Dec	Aegean Airlines
31 Dec - 31 Jan	Saudia
31 Dec - 30 Jan	Saudia
31 Dec - 17 Jan	Saudia
31 Dec - 18 Jan	Saudia
30 Dec - 26 Jan	Saudia
24 Dec - 20 Jan	Scandinavian Airlines
30 Dec - 27 Jan	Saudia
15 Dec - 21 Dec	SWISS
15 Dec - 25 Dec	SWISS
10 Dec - 14 Dec	Scandinavian Airlines
15 Dec - 18 Dec	SWISS
10 Dec - 17 Dec	Scandinavian Airlines
07 Dec - 12 Dec	SriLankan Airlines
10 Dec - 21 Dec	Qatar Airways
17 Dec - 27 Dec	SWISS

Also check the deals for one-way flights from London to Sylhet Osmani 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 Sylhet Osmani in December from 852€

Return flights