A well-worn travel legend says that Tuesday is the best (and cheapest) day to book your flight. However, here in the UK at least, it would seem that the myth is exactly that – just a myth. Holiday booking site Opodo says that Sunday is the cheapest day for buying a plane ticket.

In 2026, the cheapest days to fly to or from the UK consistently remain Tuesday and Wednesday. These mid-week days see the lowest demand from both business travelers (who favor Mondays and Fridays) and "city break" tourists (who favor long weekends). According to recent flight data, flying on a Tuesday can save you an average of 15–25% compared to a Sunday departure. Additionally, Saturday afternoons and evenings can occasionally offer "flash" deals, as most travelers prefer to arrive at their destination by Saturday morning. Conversely, Friday and Sunday are the most expensive days due to the high volume of weekend commuters. If you are flying into major hubs like Heathrow (LHR) or Gatwick (LGW), time of day also matters; mid-day flights (11:00 AM to 3:00 PM) often carry a lower price tag than the early morning "business bank" of flights. To maximize savings, travelers should use "flexible date" search tools to compare the stark price differences between a Wednesday departure and the surrounding weekend dates.