Has your itinerary recently changed? If you bought your journey with Southwest Airlines, which allows its customers to modify their flight tickets, you can do it relatively quickly. You can submit requests for flight changes using Southwest Airlines change policy, and if you are unsure about the flight change policy, you can do so by following the steps provided.
Policy for Southwest Flight Changes:
Within 24 hours after making your reservation, you are free to change your flight.
Depending on the kind of your ticket, you can also change a flight up to 24 hours after booking it, but you'll have to pay a change fee.
You can also request a flight change without paying a fee if a flight is delayed for longer than three hours.
Read more : Jetblue Airlines change policy