Customers are still able to check in up to 24 hours before the flight, using the United mobile app. The airline's full check-in time policy is available on its website.

If you check in after the 45-minute cutoff time, you can still board the flight, but your bag probably won’t make it, and there’s a good chance you’ll have to leave it behind.

“You have to check in early enough to meet the bag drop cutoff, which is usually 45 minutes before departure for domestic flights and longer for international.” But that’s just the baseline.

United Airlines has a new check-in policy beginning June 3: What you need to know so you don't miss your flight The new rule, which goes into effect on Tuesday, will provide "greater consistency ...

Starting June 3, United Airlines will change its check-in time limits for domestic flights. Under the new rules, all travelers on domestic flights must check in at least 45 minutes before departure.

Here's the new deadline Previously, the check-in cutoff for United Airlines was 30 minutes for domestic flights. By NBC Chicago Staff • Published June 3, 2025 • Updated on June 3, 2025 at 5:12 am ...

According to published reports, United Airlines will soon require travelers without checked luggage to check in at least 45 minutes before their flight. The new policy will begin on Tuesday, June 3.