The cheapest London to Cartagena return flight on the radar right now is £685, flying with Air Canada via one or more connections. It covers departures in March 2027, and every dated link below opens that exact LHR–CTG search on Skyscanner. Across 89 recorded checks it has ranged between £585 and £1,026. Our sampling points to March 2027 as the cheapest month to fly London to Cartagena.
Prices are re-checked against Skyscanner automatically, and every one shows when it was last confirmed, so nothing here is older than it looks. Not flying from London? We track 52 other departure cities for Cartagena, listed at the foot of this page.
Prices like this tend to vanish fast. If it has gone when you look, try the days either side of the dates above, since London to Cartagena is often still worth booking within a day or two of the fare we found.