Greetings,

Next September, we just booked a UA flight from LAX to LHR. I need to book a separate flight to GVA (we're flying on miles and it just made more sense to pay cash for LHR to GVA).

Our flight from LAX is scheduled to arrive at 7:35 am to whatever terminal flights from LAX on UA arrive at.

What is the minimum connection time I should look for to GVA?

Do we have to go through customs/immigration at LHR if we are connecting on a separate ticket? If we have to change terminals, how do we do that? I've been to LHR several times but never connected there.

Are there airlines that are better in terms of ease of this whole thing? We do want a nonstop from LHR to GVA, but otherwise I'm not fussed for an hour and 45 minute flight. We are carrying on rollaboards plus underseat backpacks and strongly prefer not to check.

Thanks for your help!