AirHint found the following cheapest return flights from London (STN) to Kathmandu (KTM) in September 2026 (see full year).

Return flights

10 Sep - 27 Sep	Pegasus Airlines
07 Sep - 27 Sep	Pegasus Airlines
18 Sep - 15 Oct	Pegasus Airlines
01 Sep - 06 Oct	Ryanair
01 Sep - 15 Sep	Pegasus Airlines
01 Sep - 14 Sep	Ryanair
01 Sep - 30 Sep	Ryanair
01 Sep - 16 Sep	Ryanair
23 Sep - 21 Oct	Ryanair
19 Sep - 30 Sep	Ryanair
11 Sep - 25 Sep	Ryanair
08 Sep - 15 Sep	Pegasus Airlines
25 Sep - 14 Oct	Pegasus Airlines
03 Sep - 10 Sep	Ryanair
14 Sep - 03 Oct	Pegasus Airlines
18 Sep - 03 Oct	Pegasus Airlines
21 Sep - 08 Oct	Ryanair
27 Sep - 27 Oct	Pegasus Airlines
17 Sep - 22 Oct	Ryanair
24 Sep - 11 Oct	Ryanair

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 547€

Return flights