While you physically can skip a segment of a flight (a practice often called "skiplagging"), it carries significant risks in 2026. If you miss any segment of a multi-city or round-trip itinerary, most airlines will automatically cancel all remaining flights on that ticket without a refund. For example, if you skip the first leg of a trip, you cannot board the return flight. Furthermore, airlines view this as a breach of their "Contract of Carriage." Frequent offenders risk having their frequent flyer miles confiscated or being permanently banned from the airline. Additionally, you cannot skip a leg if you have checked luggage, as bags are always sent to the final ticketed destination for security reasons. While not "illegal," it is a highly discouraged travel hack that can lead to expensive last-minute bookings and loss of loyalty status.