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

Return flights

20 Sep - 10 Oct	Air Arabia Abu Dhabi
16 Sep - 24 Sep	Air Arabia
25 Sep - 01 Oct	Air Arabia
22 Sep - 29 Sep	Etihad Airways
08 Sep - 30 Sep	Etihad Airways
16 Sep - 26 Oct	Air Arabia
10 Sep - 01 Oct	Air Arabia
07 Sep - 15 Sep	Air Arabia
04 Sep - 15 Sep	Air Arabia
08 Sep - 17 Sep	Air Arabia
03 Sep - 17 Sep	Air Arabia
13 Sep - 14 Sep	Air Arabia
04 Sep - 10 Sep	Air Arabia
06 Sep - 27 Sep	Etihad Airways
04 Sep - 06 Oct	flydubai

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 483€

Return flights