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

Return flights

01 Sep - 14 Sep	Aegean Airlines
01 Sep - 15 Sep	Aegean Airlines
01 Sep - 13 Sep	Aegean Airlines
02 Sep - 11 Sep	Aegean Airlines
14 Sep - 24 Sep	Kuwait Airways
01 Sep - 21 Sep	Aegean Airlines
08 Sep - 21 Sep	Aegean Airlines
14 Sep - 06 Oct	Kuwait Airways
08 Sep - 14 Sep	KLM
12 Sep - 27 Sep	KLM
09 Sep - 28 Sep	Air France
14 Sep - 05 Oct	Kuwait Airways
17 Sep - 17 Oct	KLM
01 Sep - 22 Oct	Aegean Airlines
14 Sep - 12 Oct	Kuwait Airways
29 Sep - 15 Oct	Air India
01 Sep - 01 Oct	Air India
30 Sep - 14 Oct	Air India
30 Sep - 23 Oct	Air India
09 Sep - 02 Oct	Air India

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 583€

Return flights