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

Return flights

11 Sep - 21 Sep	Saudia
09 Sep - 21 Sep	Saudia
08 Sep - 24 Sep	Saudia
05 Sep - 20 Sep	Saudia
08 Sep - 21 Sep	Saudia
07 Sep - 14 Sep	Saudia
07 Sep - 15 Sep	Saudia
04 Sep - 20 Sep	Saudia
12 Sep - 21 Sep	Saudia
12 Sep - 27 Sep	Saudia
28 Sep - 18 Oct	Eurowings
17 Sep - 15 Oct	Eurowings
28 Sep - 10 Oct	Eurowings
07 Sep - 05 Oct	Aegean Airlines
07 Sep - 07 Oct	Aegean Airlines
07 Sep - 06 Oct	Aegean Airlines
08 Sep - 04 Oct	Aegean Airlines
08 Sep - 05 Oct	Aegean Airlines
08 Sep - 07 Oct	Aegean Airlines
08 Sep - 06 Oct	Aegean Airlines

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 542€

Return flights