United's free change policy depends on your ticket type and when you book the change

United Airlines does allow free changes on most tickets, but the rules are specific. If you bought a Basic Economy ticket, you cannot change your flight for free—you will pay a change fee plus any fare difference. If you bought any other ticket type (Main Cabin, First Class, or a paid upgrade), you can change to a different flight at no charge as long as you do it before your scheduled departure time. The new flight must be on United or a United partner airline, and you pay only if the new flight costs more than what you originally paid.

The key is timing. You must request the change before your flight departs. If you miss your flight and try to change it afterward, United treats this as a missed flight, and you lose the ticket value entirely—no change is possible. Changes made online, through the app, or by phone all follow the same free-change rules; the method does not matter.

Key Takeaways

  • Basic Economy tickets cannot be changed for free; all other ticket types allow one free change before departure.
  • You must request the change before your scheduled departure time, or the ticket becomes non-refundable and non-changeable.
  • If the new flight costs more, you pay the difference; if it costs less, United does not refund the difference.
  • Changes must be to another United or United partner flight; you cannot change to a different airline for free.
  • Standby requests (flying an earlier flight the same day) are free on most tickets and do not count as your one change.

How to change your flight without a fee

Log into your United account on the website or mobile app and select "Manage My Booking." Enter your confirmation number and last name. Click "Change Flight" and select a new date and time. The system will show you available flights and calculate any fare difference. If the new flight is cheaper or the same price, you pay nothing. If it is more expensive, you see the additional cost before confirming.

You can also call United's reservations line at 1-800-864-8331 to change your flight by phone. A representative will search for available flights and process the change. Phone changes take longer than online changes, but the free-change rules are identical. Have your confirmation number and ID ready when you call.

If you are at the airport, go to a United ticket counter or gate agent. Tell them you want to change your flight. They can rebook you on the next available United flight at no charge if your ticket allows changes. Same-day standby requests (asking to fly an earlier flight the same day) are also free on most tickets and do not use up your one change allowance.

What Basic Economy passengers need to know

Basic Economy is United's lowest fare tier, and it comes with restrictions. You cannot change your flight for free. If you need to change a Basic Economy ticket, you will pay a change fee (the amount varies by route and how far in advance you change) plus any difference in fare. This makes Basic Economy less flexible than other ticket types.

If you are unsure whether your ticket is Basic Economy, check your confirmation email or log into your United account. The ticket type appears clearly on your booking details. If you bought a ticket labeled "Main Cabin," "Preferred," "First Class," or any paid upgrade, you have free change rights. Only the "Basic Economy" label means you cannot change for free.

Fare differences and refunds when you change

When you change to a new flight, United compares the price of your original ticket to the price of the new flight. If the new flight costs more, you pay the difference. If the new flight costs the same or less, you pay nothing. United does not refund the difference if you change to a cheaper flight—you keep the value of your original ticket applied to the new one.

The fare difference is calculated based on the current price of the new flight, not what you originally paid. Prices change constantly, so a flight that was cheaper yesterday may cost more today. Check the fare difference before confirming your change, because once you confirm, the change is final and non-refundable.

Changes to partner airlines and international flights

United has partnerships with other airlines, including Star Alliance members like Lufthansa, Air Canada, and Singapore Airlines. If your ticket allows free changes, you can change to a flight on one of these partner airlines at no charge, as long as the partner airline honors United's change policy. Not all partner airlines allow free changes on all ticket types, so confirm with United before switching to a partner flight.

International flights follow the same free-change rules as domestic flights. If your ticket type allows changes, you can change to a different international flight for free (plus any fare difference). However, changing between a domestic and international flight may trigger additional fees or restrictions, so call United to confirm before making that type of change.

What happens if you miss your flight

If you do not show up for your flight, you cannot change it for free. United considers a missed flight a forfeiture of the ticket. The ticket becomes non-refundable and non-changeable, and you lose the full value. This applies to all ticket types, including those that normally allow free changes.

The only exception is if you miss your flight due to a United operational issue—for example, if United closes a gate before you board or if a connection is missed because of a United delay. In those cases, United will rebook you on the next available flight at no charge. If you miss your flight for any other reason (traffic, oversleeping, confusion about the departure time), you cannot change it.

Standby flights and same-day changes

United offers free standby requests on most tickets. Standby means you ask to fly an earlier flight the same day instead of your scheduled flight. If a seat is available, United will put you on that earlier flight at no charge. Standby requests do not count as your one free change, so you can still change to a different day later if needed.

To request standby, go to the airport early and ask a gate agent. You can also request standby online or through the app on the day of travel. Standby is not may provide—you fly only if there is an empty seat after all passengers with reservations have boarded. If the flight is full, you stay on your original flight.

Frequently Asked Questions

Can I change my flight more than once for free?

No. Most tickets allow one free change. If you change your flight once, any additional changes will incur a change fee. Basic Economy tickets do not allow any free changes. If you need to change multiple times, call United to discuss your options.

Do I have to change to a flight on the same day?

No. You can change to any future date, as long as you request the change before your original flight departs. There is no limit on how far in the future you can move your flight. However, if your ticket has an expiration date (usually one year from purchase), you must use it by that date.

What if the new flight is cheaper than my original ticket?

United does not refund the difference. The value of your original ticket is applied to the new flight. If the new flight is cheaper, you straightforward pay nothing and keep the extra value in your United account as a credit for future travel.

Can I change my flight if I already checked bags?

Yes. If you change your flight before departure, your checked bags will be rerouted to your new flight automatically. If you have already checked bags and miss your original flight, contact United when ready—they may be able to retrieve your bags, but this depends on how far the original flight has progressed.

Do I need to call United to change my flight, or can I do it online?

You can change online through the United website or app, which is faster than calling. Call only if you cannot find your booking online or if you need help choosing a new flight. The free-change rules are the same whether you change online or by phone.