A comprehensive 888 829 1467 guide to United Airlines’ new same-day

That’s short for “same-day change,” an airline option to replace your original reservation with a new, confirmed reservation on a different itinerary to the same destination. Most airlines allow some form of this, often free for higher-tier elites, and it is worth learning their rules. But United Airlines’ implementation stands out for its flexibility — especially if you know how to look beyond its app’s same-day change suggestions. And starting Jan. 1, 2021, it’s going to be available free of charge to all MileagePlus elite members.