Unfortunately, no. You need to have a boarding pass for a same day flight on United or Star Alliance to use the United Club. This is true even for Club Members, not just the one time passes.

Correct. Also, the United Club is in Heathrow Terminal 2, which is a (literal) train's ride away from T3 and T5 where BA operate. Even if you could get into the club, it'd be a logistical nightmare to get to.

Go into the city, and enjoy the layover. I am sad I have to cancel my trip to London starting tomorrow.

Even if you could (you cannot) use the UC, you would have to clear security multiple times. Anyway, go into town.

Thank you!

United one day pass in Frankfurt airport
 

I am getting confused by uniteds language re one day passes and lounge access. I have two one day passes for a united club and I am also a priority pass member. I will be on a 5 hr layover in Frankfurt arriving and departing out of terminal 1. Trying to figure out the best lounge to go to with least hassle. Seems united has a club in terminal 1 but I am unclear if they will accept one day passes.. one place it says they will only be accepted in arriving and departing airports and then later it says they will NOT be accepted in arriving airports.. so confusing. If anyone can provide any advice on any of the above I would appreciate it. Thanks

No lounge at FRA will accept the One Time Pass. Those are only usable at UA operated UCs
UA has no lounges at FRA (except a arrivals lounge which is outside of security, just for Polaris customers, does not accept UC passes and closes around noon)

There is no United Club at FRA.

Thank you I read somewhere there was and now went to the website and you are correct there is none so I am stuck with priority lounge which is landside I believe and that means I have to go through security again...

United had a lounge (Red Carpet Club) in FRA many years ago, but now just uses the LH lounges. I'm not sure if the Luxx Lounge (priority pass) is worth an extra security check and immigration. 5 hours is a tough layover in FRA. Probably not quite enough time to go into Frankfurt for a couple hours.

Explorer card club passes
 

Explorer card club passes

I booked an itinerary where I think I can use some expiring passes on the outbound. How soon do new passes show up? I’d like to know if I can use them on the return also. Ex flight is on May 3, passes expire May 9 and return is May 13.

Since the return is after the expiration of the one-time pass, the pass cannot be used for that flight.

A pass must be used on or before the expiration date.

Passes are issued each year. I’m asking if expiration is May 9, when will I get the next new annual passes? On May 10 or some time in the future? I have not used mine for a few years and never paid attention to renewal dates.

I mostly fly AA, but have a United card that gives me two club day passes. My son is traveling IAD-LHR-IAD this coming November. (Thanksgiving week). My questions are 1) is it possible to screenshoot the passes and transfer to him, and 2) if that’s ok, given the heavy travel that week will either the IAD or LHR clubs even be accepting day passes? Appreciate any feedback.

Yes

If travelling at peak periods, yes that will be a problem

On anniversary date I am always emailed my passes, you should be able to just forward those PDFs as well