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

Return flights

31 Dec - 29 Jan	Turkish Airlines
30 Dec - 20 Jan	IndiGo
05 Dec - 08 Dec	Turkish Airlines
01 Dec - 15 Dec	Austrian Airlines
04 Dec - 24 Dec	Turkish Airlines
26 Dec - 21 Jan	Air India
26 Dec - 23 Jan	Air India
01 Dec - 08 Dec	Qatar Airways
30 Dec - 16 Jan	Turkish Airlines
31 Dec - 21 Jan	Turkish Airlines
01 Dec - 31 Jan	Saudia
01 Dec - 19 Jan	Saudia
01 Dec - 15 Jan	Saudia
01 Dec - 13 Jan	Saudia
08 Dec - 12 Dec	IndiGo
10 Dec - 14 Dec	IndiGo
01 Dec - 16 Dec	Saudia
02 Dec - 16 Dec	Saudia
07 Dec - 20 Dec	IndiGo
08 Dec - 15 Dec	IndiGo

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 687€

Return flights