How do you apply miles to an already booked flight?

Answer 1

To apply miles to an already booked flight, you typically need to log into your airline's frequent flyer account and find the option to use miles for upgrades or to offset ticket costs. Depending on the airline, you may be able to call customer service to request the application of miles to your existing reservation. Review the airline's policies, as some may allow for changes without fees, while others might charge a fee for adjustments. Always check for any eligibility requirements or restrictions related to the fare type of your booked flight.