To save up to 11% on this flight, we recommend booking at least 61 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Portland, Maine to Vietnam from $1,012 1-2 weeks out and tickets from $1,076 for flights departing within the next 72 hours.
When flying from Portland, Maine to Vietnam, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
March can be a great time to fly to Vietnam from Portland, Maine with a flight ticket averaging about $1,004. Cheapflights users have found deals in the month of March for as cheap as $682. The most expensive prices can be found in the month of December.