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

Return flights

08 Sep - 27 Sep	Wizz Air UK
05 Sep - 26 Sep	Pegasus Airlines
10 Sep - 08 Oct	Ryanair
01 Sep - 02 Oct	Wizz Air UK
01 Sep - 15 Sep	Wizz Air UK
01 Sep - 30 Sep	Wizz Air UK
01 Sep - 11 Sep	Wizz Air UK
08 Sep - 28 Sep	Wizz Air UK
07 Sep - 06 Oct	Ryanair
01 Sep - 03 Oct	Wizz Air UK
01 Sep - 24 Sep	Wizz Air UK
02 Sep - 26 Sep	Ryanair
09 Sep - 25 Sep	Wizz Air UK
10 Sep - 09 Oct	Ryanair
07 Sep - 09 Oct	Ryanair
11 Sep - 30 Sep	Wizz Air UK
16 Sep - 07 Oct	Ryanair
12 Sep - 02 Oct	Wizz Air UK
05 Sep - 07 Oct	Wizz Air UK
15 Sep - 07 Oct	Wizz Air UK

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.

Book a cheap hotel in Kathmandu

Cheap car rent in Kathmandu

Cheapest return flights from London to Kathmandu in September from 483€

Return flights