Passport expires 6 days after return to states.

I might print the relevant part of the website out just in case, but I would expect
that if you can get into the UK you are good for the trip, with the potential exception
of the return.

If, for instance, your return flight got changed and they sent you to another country
for an overnight stay, then you could be stuck in the airport. Assuming you're not
on an airline with very few flights, though, this is low probability.

I can surmise the answer, but if you knew the passport was going to expire right after
your trip, why didn't you renew it a few months ago?

Technically, you are right about coming into the UK and the US. Where I would worry is that the airline(s) might refuse you. There are many horror stories floating out there where a gate agent has refused boarding to someone because of perceived or perhaps misunderstood airline rules (vaccination cards, visas, passports, etc.) If you can, get in writing from your airline that your passport is valid for the flights you are taking, and have a printout of that with you when you travel.

Appreciate the solution focused responses. I didn’t renew it earlier because life happens. A mistake that I won’t repeat. Thank you for feedback.

As others have said, you don't need to panic, but you'd be taking a risk with this expiration date. The State Department does offer expedited service, which costs extra but may be worthwhile for peace of mind. If I were you I would use that service and renew now, but I tend to be risk averse.

We had to renew my husband's passport this year. We used the regular service, which said 10-13 weeks. He got the new one in about 4 weeks.

no panic. Your passport is valid for the UK,

https://www.gov.uk/uk-border-control