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

Return flights

12 Sep - 06 Oct	Pegasus Airlines
12 Sep - 19 Sep	Pegasus Airlines
12 Sep - 22 Sep	Pegasus Airlines
11 Sep - 29 Sep	Pegasus Airlines
12 Sep - 11 Oct	Pegasus Airlines
19 Sep - 25 Sep	Pegasus Airlines
15 Sep - 22 Sep	AJet
14 Sep - 04 Oct	Ryanair
12 Sep - 29 Sep	Pegasus Airlines
05 Sep - 19 Sep	Pegasus Airlines
05 Sep - 18 Sep	Pegasus Airlines
26 Sep - 07 Oct	Pegasus Airlines
11 Sep - 14 Sep	Pegasus Airlines
19 Sep - 29 Sep	Pegasus Airlines
14 Sep - 27 Oct	Ryanair
12 Sep - 04 Oct	Pegasus Airlines
28 Sep - 04 Oct	Ryanair
26 Sep - 18 Oct	AJet
25 Sep - 14 Oct	Ryanair
26 Sep - 17 Oct	AJet

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 458€

Return flights