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

Return flights

26 Sep - 08 Oct	Pegasus Airlines
19 Sep - 09 Oct	Pegasus Airlines
08 Sep - 20 Sep	Pegasus Airlines
26 Sep - 07 Oct	Pegasus Airlines
28 Sep - 07 Oct	Pegasus Airlines
23 Sep - 08 Oct	Pegasus Airlines
26 Sep - 06 Oct	Pegasus Airlines
29 Sep - 06 Oct	AJet
25 Sep - 12 Oct	AJet
27 Sep - 30 Sep	Pegasus Airlines
25 Sep - 30 Sep	Pegasus Airlines
22 Sep - 06 Oct	AJet
18 Sep - 30 Sep	AJet
25 Sep - 01 Oct	Pegasus Airlines
26 Sep - 28 Sep	AJet
16 Sep - 30 Sep	Ryanair
13 Sep - 17 Sep	Pegasus Airlines
15 Sep - 18 Sep	AJet
14 Sep - 30 Sep	AJet
10 Sep - 17 Sep	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 $522

Return flights