**It may be possible, but don’t assume it’s automatically okay.** A flight at 1:45 a.m. on May 8 is after your May 7 expiry. Overstaying can result in a fine and delay your departure. [Official travel advice](https://www.gov.uk/foreign-travel-advice/vietnam/entry-requirements).

The key point to confirm with [Vietnam Immigration](https://xuatnhapcanh.gov.vn/) is whether **clearing departure immigration before midnight on May 7** will count as leaving within your permitted stay, despite the later takeoff. I couldn’t find an official published rule guaranteeing this. Simply arriving at the airport or checking in before midnight is insufficient.

If immigration confirms this is acceptable, arrive early on the evening of May 7 and allow plenty of time to complete passport control before midnight. Otherwise, the safest option is to move the flight to May 7 or arrange an approved extension beforehand.