How to Upgrade to First Class on United for Free

To upgrade to First Class on United for free, frequent flyers and MileagePlus members with Premier status have the best options. United often offers complimentary upgrades to Premier members based on availability, loyalty status, and fare class. You can increase your chances by booking flights with lower occupancy, checking for upgrade eligibility when booking or at check-in, and joining United’s upgrade waitlist. Occasionally, credit card holders with certain United co-branded cards may also receive upgrade opportunities. Free upgrades are not guaranteed, so having Premier status or booking through United’s MileagePlus program can improve your odds.