Leggings are widely regarded as one of the most comfortable choices for long-haul flights because of their stretchability and lack of restrictive waistbands, which is essential when your body naturally bloats at high altitudes. In 2026, the trend of "athleisure" means you can find high-quality, "compression" style leggings that not only feel comfortable but also help with blood circulation during a 10-hour journey, potentially reducing the risk of Deep Vein Thrombosis (DVT). However, there are a few considerations: standard thin leggings may not provide enough warmth in the often-chilly cabin air conditioning, so "thermal" or "high-denier" versions are better. For style and modesty, many travelers pair them with a long tunic or an oversized sweater. It is also important to choose breathable, moisture-wicking fabrics like a nylon-spandex blend rather than 100% cotton, which can become uncomfortable if you get hot. One minor tip for "non-revenue" or "standby" travelers: some airlines still have legacy dress codes for staff travel that prohibit leggings in premium cabins, but for standard paying passengers, they are a staple of modern travel comfort.