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Allegiant does sell an add-on called TripFlex that waives these fees and allows changes to be made until one hour before departure. American Airlines has a whopping $200 change fee on paid fares (other than full fare refundable tickets) for domestic flights, and up to $450 for international flights.Same day changes are $75 in economy and free for business and first class passengers on paid fares.S Airways charges a change free of $200 per passenger for domestic paid tickets, $150 â $750 for international paid tickets, and $150 for award tickets (waived for those with Chairmanâs Preferred status).
United Airlines. Same-day change fees on United Airlines cost passengers $75. For changes to a ticket that extend beyond 24 hours of the original flight time, passengers must pay a $150 flight change fee for domestic flights, and $250 for international. Airline change fees on any domestic Delta flight will cost passengers $150, regardless whether or not the change for a same-day flight.