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

Return flights

07 Sep - 29 Sep	Pegasus Airlines
04 Sep - 18 Sep	Pegasus Airlines
13 Sep - 19 Sep	Ryanair
25 Sep - 04 Oct	AJet
12 Sep - 19 Sep	Jet2
15 Sep - 22 Sep	Ryanair
05 Sep - 10 Sep	Pegasus Airlines
08 Sep - 02 Oct	Ryanair
08 Sep - 25 Sep	Ryanair
08 Sep - 28 Sep	Pegasus Airlines
04 Sep - 28 Sep	AJet
05 Sep - 23 Sep	Pegasus Airlines
18 Sep - 10 Oct	Ryanair
13 Sep - 02 Oct	Ryanair
09 Sep - 02 Oct	Ryanair
20 Sep - 06 Oct	Ryanair
14 Sep - 12 Oct	Ryanair
26 Sep - 17 Oct	Ryanair
22 Sep - 22 Oct	Ryanair
29 Sep - 16 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 $618

Return flights