The airline announced the launch of the non-stop service between the Minnesota city and Arizona.
To celebrate the launch Allegiant said it would reward only four passengers. The winners will have to present themselves at Duluth Airport with their bags packed, and the award will be free ticket flights for the route.
The fares are now available on the non-stop route between both cities at $99.99 one way.
Services operate twice a week on Mondays and Fridays. Flights leave Duluth at 19:45 and arrive in Pheonix-Mesa at 21:10. Return services are scheduled to leave Pheonix-Mesa at 13:55 and arrive in Duluth at 19:05.