More than a quarter of flights to UK airports are delayed, new figures show.

Analysis of more than 850,000 inbound flights revealed that 26% failed to arrive within 15 minutes of their schedule last year.

Canadian leisure airline Air Transat was the worst performer with 45% of its flights late, followed by Icelandair (44%) and Norwegian (40%).

Delayed passengers may be able to claim compensation under EU law, but if the disruption is caused by factors such as extreme weather or airport strikes they are unlikely to receive a payout.

KLM was found to be the most punctual airline in 2016 with just 12% of flights late.

Which? claims passengers making complaints against airlines are poorly served and has called for the next government to introduce a transport ombudsman that all airlines must join to improve the way grievances are dealt with.

The organisation's magazine editor, Richard Headland, said: "Flight delays are one of the most annoying things about travelling. These figures show just how frequently flights fail to reach their destination on time."

"We know that resolving complaints with airlines can be a very tricky process, so we're calling on the next government to legislate for a new, mandatory transport ombudsman."

A spokesman for Air Transat said: "The statistics in this report do not take into account the delays caused by factors beyond our control such as weather and air traffic control. When these factors are excluded, our punctuality rate is in fact 78%."