AirHint found the following cheapest return flights from Colombo (CMB) to London (LHR) in September 2025 (see full year).

Return flights

09 Sep - 13 Sep	Flexflight
08 Sep - 17 Sep	AirAsia
25 Sep - 01 Oct	IndiGo
22 Sep - 29 Sep	IndiGo
16 Sep - 24 Sep	Air India
16 Sep - 23 Sep	Air India
17 Sep - 25 Sep	Air India
11 Sep - 11 Sep	Air India
23 Sep - 01 Oct	Air India
24 Sep - 02 Oct	Air India
25 Sep - 02 Oct	Air India
07 Sep - 15 Sep	IndiGo
22 Sep - 22 Sep	Air India
30 Sep - 07 Oct	Air India
18 Sep - 21 Sep	Air India
10 Sep - 01 Oct	Air India
24 Sep - 04 Oct	Air India
21 Sep - 19 Oct	Etihad Airways
16 Sep - 26 Oct	Air India
11 Sep - 04 Oct	Air India

Also check the deals for one-way flights from Colombo to London 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 Colombo to London in September from 506€

Return flights