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

Return flights

05 Sep - 14 Sep	jetBlue
04 Sep - 14 Sep	jetBlue
20 Sep - 28 Sep	jetBlue
06 Sep - 21 Sep	jetBlue
20 Sep - 27 Sep	jetBlue
12 Sep - 27 Sep	jetBlue
12 Sep - 26 Sep	jetBlue
21 Sep - 27 Sep	jetBlue
19 Sep - 28 Sep	jetBlue
15 Sep - 29 Sep	jetBlue
22 Sep - 05 Oct	jetBlue
17 Sep - 01 Oct	Avianca
23 Sep - 08 Oct	jetBlue

Also check the deals for one-way flights from London to Cartagena 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 Cartagena in September from 638€

Return flights