Do I need a visa for domestic flights inside Vietnam?

No extra visa is needed for domestic flights. Your entry visa or exemption covers travel inside Vietnam for the period it is valid, and there is no immigration check between domestic airports.

Carry your passport, because airlines ask for photo ID at check-in and at boarding. A phone photo of the passport is usually not accepted, so keep the original with you. Hotels also hold passport details for registration.

Check that your visa or exemption lasts for your whole trip, including the last domestic leg and your departure flight. If you will be in Vietnam longer than your visa, extend or re-apply before it ends.

If you do not have a visa yet and your itinerary has several flights, a multiple-entry e-visa also covers a side trip abroad and back. See the Vietnam travel guide for planning help.