Discover United Airlines Baggage Policy is clear and flexible, serving all kinds of travelers. Carry-on allowance is very generous with one personal item and a standard carry-on included for most fares except Basic Economy. Checked baggage fees are reasonable, but they depend on the route and fare class. Additional perks are provided to MileagePlus members and premium cabin travelers. The policy is simple, but charges for overweight or oversized luggage might be a disadvantage. The policy is a perfect blend of convenience and cost.