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

Return flights

17 Sep - 23 Sep	jetBlue
17 Sep - 29 Sep	jetBlue
17 Sep - 24 Sep	jetBlue
15 Sep - 22 Sep	jetBlue
06 Sep - 15 Sep	jetBlue
15 Sep - 29 Sep	jetBlue
08 Sep - 15 Sep	jetBlue
05 Sep - 09 Sep	Air Canada
20 Sep - 27 Sep	jetBlue
08 Sep - 18 Sep	Air Canada
29 Sep - 07 Oct	Virgin Atlantic
26 Sep - 11 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 555€

Return flights