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

Return flights

07 Sep - 19 Sep	AJet
05 Sep - 15 Sep	AJet
08 Sep - 26 Sep	Pegasus Airlines
01 Sep - 15 Sep	Pegasus Airlines
05 Sep - 29 Sep	Pegasus Airlines
03 Sep - 12 Sep	Pegasus Airlines
01 Sep - 22 Sep	Pegasus Airlines
12 Sep - 26 Sep	AJet
03 Sep - 19 Sep	Pegasus Airlines
06 Sep - 27 Sep	Pegasus Airlines
05 Sep - 17 Oct	AJet
13 Sep - 03 Oct	Pegasus Airlines
07 Sep - 04 Oct	Pegasus Airlines
13 Sep - 04 Oct	Pegasus Airlines
12 Sep - 04 Oct	AJet
08 Sep - 06 Oct	AJet
12 Sep - 15 Oct	AJet
20 Sep - 04 Oct	Pegasus Airlines
19 Sep - 03 Oct	Pegasus Airlines
18 Sep - 10 Oct	AJet

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 514€

Return flights