Airlines don't usually hold connecting flights for delayed passengers. ... United's new Connection Saver tool automatically places a hold on some outbound flights, but it could cause further delays.

How long will airlines wait for connecting passengers?

Consider allowing at least 60 to 90 minutes for a U.S. domestic connection, and at least two hours for an international connection. Airlines usually allow you four hours or more maximum connecting time.

Is 45 minutes enough time for a connecting flight?

As a rule of thumb, on domestic routes, you need a minimum of 45 minutes between flights. That's because you don't have to go through security, customs, and immigration. ... Give yourself even more time if you've checked a bag that needs to be rechecked post-customs.