A cabin upgrade on British Airways (BA) is the process of moving from your originally booked class of service to a higher one, such as from World Traveller (Economy) to World Traveller Plus (Premium Economy), or from Club World (Business) to First. Upgrades can be secured in several ways: using Avios (loyalty points), paying a fixed cash fee in "Manage My Booking," or through a "Plusgrade" bid where you offer a specific amount of money for the chance to move up. A key benefit of a BA upgrade is that you typically receive the full entitlements of the higher cabin, including increased baggage allowance, priority boarding, and access to premium airport lounges (for Business and First). In 2026, BA has increasingly used "Proactive Upgrade" offers via their mobile app, which can sometimes be significantly cheaper than the original fare difference if the airline has unsold seats in the premium cabins as the departure date approaches.