Sometimes, it might happen that you have to change or cancel your flight on the same day of the trip. Therefore, Frontier Change Flight guidelines will help you understand when to change your flight so that you don't lose your money.  Therefore, you can go through the following details to learn about the complete flight change.

What is the Frontier Airlines flight change policy?

According to their updated Frontier Airlines travel policy 2021, the airline will charge you a flight change fee if any of the following apply (unless you have a WORKS plan ticket):

• If you modify your basic ticket between 59.99 and 7 days prior to departure, the airline will impose a modification fee of USD 39 per passenger, one way. The airline will save the value of your ticket as a travel credit (less any amendment or cancellation costs).
• If you make any changes to your standard ticket six days or less before departure, a change fee of USD 59 per passenger one way will be assessed (including the same day). The airline will save the value of your ticket as a travel credit (fewer cancellation fees).

Source: https://www.zupyak.com/p/3419886/t/can-i-change-my-frontier-flight-to-the-same-day-of-travel