Flyers can request an upgrade on Finnair in several ways that are available. Some of them are using the miles, using the loyalty program, placing a bid, or they can purchase it at the time of check-in if available. The Finnair upgrade options could provide better legroom, full lie-flat seats, priority boardings and faster security checks. For more details about upgrading a flight on Finnair, one can go through the blog at the mentioned link by Airliens Group Travel.