Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Edmonton to Maine as you normally would.
Related info for your journey
Useful info, stats and facts about Edmonton to Maine flights.
This is defined as Edmonton Airport (YEG) and Portland Airport (PWM). Codes like Portland Airport are often used to just call airports uniquely. Bangor Airport (BGR), Augusta Airport (AUG), Bar Harbor Airport (BHB), Rockland Knox County Regional Airport (RKD), Presque Isle Airport (PQI) are other airports near this flight route and their unique identifiers/IATA codes.