If you are going to visit somewhere with Allegiant Airlines and you want to make sure that your booking is reserved or not or you can check all the services that you will get throughout the journey, then you can contact them via phone call by dialing at the Allegiant Airlines phone number which is +1 (802) 341-3454 or +1 (702) 505-8888. You can get an instant help from Allegiant Airlines customer service after dailing the number.
Visit: How can I talk to a live person at Allegiant Airlines?
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