How long is the flight to Lisbon?
The below times are for non stop flight segments to Lisbon Portela Airport (LIS). From Newark Liberty International Airport (EWR), the flight time is roughly 6 hours and 21 minutes. From Philadelphia International Airport (PHL), the flight time is roughly 6 hours and 36 minutes.
Please keep in mind that the above are time in the air; most travel sites will quote a ramp to ramp time which is about a 1/2 hour greater than the air time.