Frontier Airlines does not charge a change fee if you purchased an Economy, Premium, or Business bundle. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) However, for Basic Fare or Standard tickets, the fee depends on the timing: $0 if changing 60+ days before departure, $49 between 7 and 59 days before, and $99 if changing 6 days or less before the flight, including same-day changes. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) You may also need to pay any fare difference for the new flight.