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

Return flights

04 Sep - 17 Sep	Air India
08 Sep - 22 Sep	Air India
27 Sep - 06 Oct	British Airways
27 Sep - 13 Oct	British Airways
05 Sep - 21 Sep	Eurowings
25 Sep - 15 Oct	Eurowings
28 Sep - 28 Oct	British Airways
28 Sep - 27 Oct	British Airways
27 Sep - 25 Oct	British Airways
24 Sep - 01 Oct	Eurowings
30 Sep - 29 Oct	Eurowings
30 Sep - 14 Oct	Eurowings
27 Sep - 26 Oct	British Airways
17 Sep - 23 Sep	Air India
07 Sep - 22 Sep	Aegean Airlines
05 Sep - 15 Sep	Eurowings
05 Sep - 30 Sep	Eurowings
01 Sep - 30 Sep	Air India
02 Sep - 15 Sep	Air India
02 Sep - 24 Sep	Air India

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 $622

Return flights