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

Return flights

24 Sep - 30 Sep	Air India
23 Sep - 30 Sep	Air India
30 Sep - 08 Oct	Air India
30 Sep - 22 Oct	Air India
23 Sep - 07 Oct	Air India
22 Sep - 08 Oct	Air India
30 Sep - 15 Oct	Air India
24 Sep - 08 Oct	Air India
22 Sep - 29 Sep	Air India
22 Sep - 30 Sep	Air India
29 Sep - 14 Oct	Air India
22 Sep - 01 Oct	Air India
29 Sep - 12 Oct	Air India
22 Sep - 06 Oct	Air India
23 Sep - 29 Sep	Air India
23 Sep - 25 Sep	Air India
22 Sep - 25 Sep	Air India
24 Sep - 26 Sep	Air India
26 Sep - 30 Sep	Turkish Airlines
27 Sep - 30 Sep	Turkish Airlines

Also check the deals for one-way flights from London to Colombo 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 Colombo in September from 426€

Return flights