There will soon be another new travel rule that domestic flyers will have to keep in mind before heading to the airport. Starting on June 3, United Airlines will require all domestic passengers to check in for their flights at least 45 minutes before departure.

United Airlines updates the domestic check-in times to 45 minutes before departure for passengers starting June 3.

Effective June 3, United's “check-in cutoff” for most U.S. flights will be 45 minutes before departure.