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

Return flights

01 Sep - 30 Sep	ITA Airways
09 Sep - 30 Sep	ITA Airways
09 Sep - 01 Oct	ITA Airways
02 Sep - 09 Sep	British Airways
09 Sep - 04 Oct	ITA Airways
04 Sep - 04 Oct	ITA Airways
04 Sep - 01 Oct	ITA Airways
17 Sep - 30 Sep	ITA Airways
04 Sep - 05 Oct	ITA Airways
08 Sep - 05 Oct	ITA Airways
01 Sep - 06 Oct	ITA Airways
15 Sep - 30 Sep	ITA Airways
05 Sep - 05 Oct	ITA Airways
28 Sep - 18 Oct	British Airways
24 Sep - 12 Oct	British Airways
01 Sep - 18 Sep	ITA Airways
01 Sep - 16 Sep	ITA Airways
03 Sep - 27 Sep	ITA Airways
19 Sep - 21 Sep	KLM
04 Sep - 14 Sep	ITA Airways

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 759€

Return flights