A group of three holidaymakers learned the hard way that skipping the first leg of their flight from Glasgow to Heathrow cost them £9,000 in last-minute rebooking fees. According to travel experts, the lesser-known 'no-show' clause in airline tickets means that if a passenger fails to take the first flight in their itinerary, the airline can automatically cancel all remaining flights on the booking. This can result in huge unexpected costs, even for legitimate reasons such as delays or weather disruption.

The Glasgow-to-Mexico case that maxed out credit cards

According to the report, three holidaymakers decided to skip their flight from Glasgow to London Heathrow and instead took the train to the UK's busiest airport. When they tried to board their onward flight to Mexico City,they were turned away. The airline told them that because they had not taken the first segment, their entire ticket was invalid. The passengers ended up paying £9,000 for new return tickets, maxing out their credit cards in the process.

Nick Parkhouse, a travel insurance expert from Go Compare, described skipping the first leg as "one of the biggest mistakes passengers can make." He noted that most travellers are "completely unaware" of the rule and only discover it "when they're faced with huge last-minute rebooking costs at the airport."

Why airlines use the 'no-show' clause to block 'hidden city ticketing'

Tim Knighton, a travel expert at Compare the Market, explained that the policy is often in place to prevent tactics like 'hidden city tickeing,' where passengers intentionally skip part of a journey to take advantage of cheaper fares. Airlines design their ticketing systems so that a single booking is treated as one contract; missing any segment voids the rest. The source reports that travellers who think they can simply start their trip from a major hub instead of a regional airport are mistaken, as airline systems automatically cancel onward flights.

Knighton added that passengers can still be caught out for legitimate reasons such as delays, weather disruption or changes to travel plans. "If you think you may miss part of your itinerary, it's essential to contact the airline as soon as possible before the flight departs," he said.

Why travel insurance won't cover a deliberate skip

Parkhouse revealed that travel insurance is unlikely to cover any issues if a passenger purposely misses part of their journey.. Insurers could view the situation as a "deliberate decision by the passenger and a contractual issue rather than an unexpected disruption." This means that even if a traveller decides to skip a flight for a legitimately better alternative—like taking a train to avoid a short domestic hop—they are unlikely to be reimbursed for the cost of rebooking.

The source emphasises that passengers should always speak to the airline before missing any part of a connecting journey. In some cases, the airline may be able to recalculate the fare or amend the booking, depending on the ticket type and terms. But if a passenger simply fails to show, the cancellation is automatic.

What travellers can do if they need to change plans

The experts quoted in the source agree on one key action: contact the airline before the flight departs. "If plans change, passengers should always speak to the airline before missing any part of a connecting journey," Parkhouse said. Depending on the ticket type, the airline may recalculate the fare—though this could still be expensive—or amend the booking. However, the source notes that there is no guarantee, and the outcome depends on the specific fare rules.

For travellers who face unavoidable disruptions like weather or delays,the advice is the same: call the airline as soon as possible. Waiting until arrival at the airport may leave no option but to buy a new ticket at full price.