According to the regulations of airlines such as Vietnam Airlines and Vietjet Air, passengers must be present at the airport and check in at the counter at least 40 minutes before departure for domestic flights and 50 minutes for international flights. The latest online check-in time is 60 minutes before scheduled departure time.
According to CnTraveler, how early you should arrive at the airport depends on many objective factors, from airlines and airports. For domestic flights at major airports, if you have checked baggage, you should arrive 2 hours early. If you only have carry-on baggage, the time is 90 minutes. For smaller airports, the arrival times are 90 minutes and one hour, respectively. For international flights, the ideal time to arrive at the airport is 3 hours before departure.
However, counter opening or closing times may vary depending on the airport or specific flight.

Therefore, in case you discover that you have forgotten your passport, in addition to asking someone to bring it to the airport, you can refer to solutions from domestic and foreign travel communities:
- Check in online first, wait for your passport to go straight to the boarding gate. This will save time. Check in online does not require a passport, just passport number and flight ticket information.
- Report to airport security about the loss of your passport at the airport. At that time, there will be a manager or supervisor and you can carry out the flight without identification documents. It is best to have a copy of your passport. They will ask you to present other forms of identification (documents such as CCCD, driver's license...) and will use comparison technology.
- When the above cases cannot be done, contact the airline to cancel or postpone the flight ticket. You will lose a certain amount of money, but may not lose the whole amount (based on the ticket conditions) and find another alternative flight when you get your passport.
According to vnexpress.net
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