Delta Air Lines offers this service for free. You can request to be put on standby over the phone, on an airline’s app or website, and at the help desk at the gate.

For non-members, Silver Medallion Members, and General SkyMiles Members, you’ll have to choose a flight that is earlier than the one that you booked. Diamond, Platinum, and Gold Medallion Members can pick a flight any time that day. Delta’s standby service is available for all flight classes except for Basic Economy. You can get on the standby list for multiple-segment flights, but you’ll have to sign up for the standby list for each segment.

To register for the Delta standby list over the phone with a Delta representative, call 800-221-1212. [5] X Research source

Delta doesn’t charge change fees on flights originating from North America for Delta One, Delta Premium Select, First Class, Delta Comfort+, and Main Cabin ticket holders. Basic Economy ticket holders can’t change their ticket unless they have a Basic Economy waiver. If you would like to change your ticket to a more expensive flight, you’ll have to pay the difference.

You can only use this service on domestic flights. You have to choose a flight that is on the same day as the ticket you’ve already purchased. You’ll have to wait until you’re within 24 hours of your flight to use the Same-Day Confirmed service.

To determine the price of the fee, you’ll have to get in touch with a Delta representative. Reach them through Delta’s customer service line by calling 800-221-1212. [9] X Research source