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

Return flights

01 Dec - 08 Dec	Air India
01 Dec - 07 Dec	Air India
01 Dec - 05 Dec	Air India
02 Dec - 05 Dec	Air India
18 Dec - 02 Jan	KLM
25 Dec - 29 Jan	SWISS
18 Dec - 15 Jan	KLM
06 Dec - 27 Dec	Oman Air
25 Dec - 18 Jan	SWISS
06 Dec - 20 Dec	Oman Air
07 Dec - 23 Dec	Oman Air
25 Dec - 17 Jan	SWISS
25 Dec - 11 Jan	SWISS
25 Dec - 25 Jan	SWISS
27 Dec - 19 Jan	LOT
18 Dec - 17 Jan	KLM
25 Dec - 07 Jan	SWISS
01 Dec - 24 Dec	Etihad Airways
01 Dec - 19 Dec	Qatar Airways
01 Dec - 31 Dec	Qatar Airways

Also check the deals for one-way flights from London to Kathmandu 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 Kathmandu in December from 645€

Return flights