Allegiant Air Customer Service We are amongst the top-most airline service providers and are known for its classy travelling features, all equipped to serve you with solutions that suit you. We offers the lowest fare available at the time and place of booking, to know about our check-in policy, you can visit and look for it on our website.Any sort of questions related to Allegiant Airlines can be asked any time anywhere. We are available 24*7 to answer them.Just  dial our Allegiant Airlines helpline number which is +1(702)765-4833. Contacting us also allows you to get proper information on Unaccompanied Minor, baggage policy, date change, flight cancellation, check-in policy, etc.