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

Return flights

09 Sep - 24 Sep	ITA Airways
08 Sep - 14 Sep	British Airways
09 Sep - 14 Sep	British Airways
06 Sep - 10 Sep	KLM
01 Sep - 05 Sep	British Airways
05 Sep - 10 Sep	British Airways
08 Sep - 25 Sep	SWISS
08 Sep - 02 Oct	SWISS
01 Sep - 01 Oct	SWISS
15 Sep - 22 Sep	SWISS
01 Sep - 29 Oct	SWISS
04 Sep - 29 Oct	SWISS
17 Sep - 29 Oct	SWISS
16 Sep - 28 Oct	SWISS
08 Sep - 28 Sep	SWISS
16 Sep - 27 Oct	SWISS
20 Sep - 29 Oct	SWISS
30 Sep - 29 Oct	SWISS
29 Sep - 29 Oct	SWISS

Also check the deals for one-way flights from London to Kathmandu 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 London to Kathmandu in September from $795

Return flights