British Airways offers different mediums for seat upgrades, such as vouchers or Avios. But travelers prefer to Upgrade Seats British Airways to the next class with the help of Avios, as it offers better deals. To upgrade your BA flight using Avios, passengers first have to log in to their Executive Club account and have to visit the Manage My Booking page. Select an eligible flight and choose to upgrade using your Avios points. To know more details, visit the BA official website or check out the blog linked above.