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Day 2 test on return from France, can it double as test required for flight home to US?

Hi all, thanks so much for helping navigate travel in these complicated times.
Four of us are flying to London in late Sept. Four nights in London to visit our daughter, then 3-day trip to Paris, via Eurostar, then back to UK for four more nights.

All together we are looking at 20 Covid tests between the four of us to make this happen. That's a lot of chance to test positive and have trip tripped up -- which is another issue we are grappling with. (We are all vaccinated, but realize we can get it, spread it, and could land in an isolation hotel room, despite trying hard to be careful. )
That important issue aside for now, here are a few logistical questions:
We are wondering if the Day 2 test required by UK for return from France can be used twice -- for day 2 and as the test we need to get on our flight home. The timing works, but is that legal, or even possible? That would eliminate need to buy 4 tests.
Also for start of trip can our daughter there buy our Day 2 tests at a pharmacy or online and hold them for us? I'm assuming we could use scan of proof of her purchase to show when required to offer proof? Maybe that doesn't make sense and it would be better for us to have them mailed to her or just bring along with us?
We also could cut France from itinerary, and stay in UK. (My husband's vote.)

Thank you so much.
R and R

Posted by
39 posts

Right, so we return from Paris on Thursday, take day 2 test on Saturday and flight out is Monday. Then the Saturday test should be ok?
thanks, R and R

Posted by
415 posts

If your flight to the US in on a Monday, you can take your return to the US test anytime from the Friday before. So, a test the Saturday before your Monday flight will be fine. You can double check the info. here on the CDC website. Scroll down to

Why does the Order specify 3 days rather than 72 hours? What is
considered 3 days?

The 3-day period is the 3 days before the flight’s departure. The
Order uses a 3-day timeframe instead of 72 hours to provide more
flexibility to the traveler. By using a 3-day window, test validity
does not depend on the time of the flight or the time of day that the
test was administered. For example, if a passenger’s flight is at 1pm
on a Friday, the passenger could board with a negative test that was
taken any time on the prior Tuesday or after.

Posted by
39 posts

thanks for clarification...