Consumer group Which? found that more UK flights are delayed now than before the COVID-19 pandemic. Among the UK’s six major airlines, TUI Airways ranked worst for punctuality, followed by Wizz Air and Ryanair.

Wizz Air

IATA Code

W6

ICAO Code

WZZ

Airline Type

Ultra-Low-Cost Carrier

Year Founded

2003

CEO

József Váradi

IATA/ICAO Code

W6/WZZ

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In response, TUI airways defended its record, stating that it cancels fewer flights than its airline rivals. According to the report, airlines attribute the delays to an increasing shortage of aviation staff, particularly air traffic controllers (ATC). The consumer group analyzed data from the UK Civil Aviation Authority (CAA) covering the 12 months to April 2025 and compared it with pre-pandemic figures.

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