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

Return flights

23 Sep - 14 Oct	Ryanair
01 Sep - 16 Sep	Ryanair
29 Sep - 10 Oct	Wizz Air
22 Sep - 27 Sep	Ryanair
09 Sep - 27 Sep	Wizz Air
12 Sep - 13 Oct	easyJet
15 Sep - 29 Sep	easyJet
26 Sep - 03 Oct	Wizz Air
12 Sep - 24 Sep	easyJet
19 Sep - 30 Sep	easyJet
08 Sep - 19 Sep	easyJet
09 Sep - 30 Sep	easyJet
15 Sep - 10 Oct	easyJet
24 Sep - 24 Oct	easyJet
03 Sep - 27 Sep	Fly One
07 Sep - 28 Sep	Wizz Air
03 Sep - 03 Oct	easyJet
24 Sep - 12 Oct	easyJet
17 Sep - 30 Oct	easyJet
23 Sep - 04 Oct	easyJet

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 $710

Return flights