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

Return flights

28 Sep - 30 Oct	IndiGo
29 Sep - 08 Oct	IndiGo
17 Sep - 25 Oct	Air India
24 Sep - 01 Oct	Nepal Airlines
16 Sep - 30 Sep	Air India
25 Sep - 05 Oct	Air India
18 Sep - 02 Oct	Air India
20 Sep - 26 Oct	Nepal Airlines
25 Sep - 02 Oct	IndiGo
30 Sep - 07 Oct	Nepal Airlines
23 Sep - 27 Oct	Nepal Airlines
16 Sep - 29 Sep	Air India
17 Sep - 24 Sep	Nepal Airlines
22 Sep - 29 Sep	Nepal Airlines
17 Sep - 28 Sep	SpiceJet
16 Sep - 23 Sep	Air India
19 Sep - 26 Sep	Nepal Airlines
18 Sep - 26 Sep	Nepal Airlines
20 Sep - 21 Sep	Nepal Airlines
19 Sep - 27 Sep	Air India

Also check the deals for one-way flights from Kathmandu to London 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 Kathmandu to London in September from 683€

Return flights