kionsemi Posted Tuesday at 07:21 PM Report Share Posted Tuesday at 07:21 PM Yes, there is a fee to change Allegiant flight details. The fee depends on the fare type, route, and how far in advance you make the change. To get the most accurate information on fees, contact Allegiant customer service at +1-888-765-0508. When you need to modify your reservation, calling +1-888-765-0508 can provide you with the exact amount and assist with any changes you want to make. Allegiant is transparent with its fees, so you won’t be surprised by any hidden charges. For more details about how to change flight details and the costs involved, reach out to +1-888-765-0508. Quote Link to comment Share on other sites More sharing options...