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

Return flights

11 Sep - 19 Sep	Lufthansa
10 Sep - 19 Sep	LOT
04 Sep - 18 Sep	LOT
11 Sep - 25 Sep	Lufthansa
10 Sep - 22 Sep	Etihad Airways
09 Sep - 29 Sep	Air India
01 Sep - 30 Sep	Air India
01 Sep - 22 Sep	Air India
09 Sep - 30 Sep	Air India
01 Sep - 17 Sep	Air India
04 Sep - 03 Oct	LOT
18 Sep - 13 Oct	Kuwait Airways
18 Sep - 03 Oct	LOT
22 Sep - 18 Oct	SWISS
12 Sep - 10 Oct	SWISS
07 Sep - 07 Oct	Air India
25 Sep - 10 Oct	Kuwait Airways
15 Sep - 14 Oct	Kuwait Airways
01 Sep - 15 Oct	Kuwait Airways
24 Sep - 09 Oct	LOT

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 $820

Return flights