**Don’t assume this is okay.** Your flight at 1:45 a.m. on May 8 falls after your May 7 visa expiry. Overstaying can lead to a fine and delay your departure. [UK government travel advice](https://www.gov.uk/foreign-travel-advice/vietnam/entry-requirements).

Passing **departure immigration before midnight on May 7** may resolve the timing issue, but I couldn’t verify an official Vietnamese rule guaranteeing that for a flight departing the following day. Arriving at the airport or checking in alone doesn’t establish your immigration exit.

Ask [Vietnam Immigration](https://evisa.gov.vn/) whether they will accept this itinerary if you clear passport control before midnight; their support email is **foreigners@xuatnhapcanh.gov.vn**. Also check when your airline opens check-in.

The safest option is to move the flight to May 7 or arrange an approved extension covering May 8.