https://community.expensify.com/discussion/58989/1-833-460-1838-can-i-cancel-an-allegiant-flight-without-penalty-24-hour/p1?new=1 1:833::||460::||1838 Can I cancel an Allegiant flight without penalty? (24 hour) Can I cancel an Allegiant fight without penatly? Allegiant Airlines's 24-hour rule allows you to cancel or amend your flight reservation during the first 24 hours of purchase without penalty costs, as long as the flight is at least 7 days away. To cancel or amend your reservation, contact Allegiant Airlines at 1::833::||::460::||::1838