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

Return flights

19 Sep - 23 Sep	Pegasus Airlines
26 Sep - 16 Oct	AJet
26 Sep - 17 Oct	AJet
25 Sep - 09 Oct	Pegasus Airlines
25 Sep - 25 Oct	Pegasus Airlines
19 Sep - 24 Sep	Pegasus Airlines
26 Sep - 10 Oct	Pegasus Airlines
26 Sep - 02 Oct	Pegasus Airlines
26 Sep - 01 Oct	Pegasus Airlines
13 Sep - 23 Sep	AJet
19 Sep - 10 Oct	Pegasus Airlines
26 Sep - 03 Oct	Pegasus Airlines
14 Sep - 23 Sep	Ryanair
01 Sep - 22 Sep	Ryanair
20 Sep - 23 Sep	Ryanair
22 Sep - 07 Oct	Ryanair
10 Sep - 23 Sep	Pegasus Airlines
09 Sep - 23 Sep	AJet
11 Sep - 23 Sep	Ryanair
07 Sep - 23 Sep	Ryanair

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 473€

Return flights