Yes, you may change to a flight that departs on the same day as your original timetable as long as you give yourself up to 24 hours notice. For the flight of your choice, you can use any fare class, but you might have to pay the price difference. The flight has to depart on the day after your request. Using the Jetblue Airlines app or website, customers may contact customer service or make online edits. For further details on Jetblue same day flight change, please contact the consolidation desk at +1 (800) 865-1848.
https://www.flyingrules.com/cancellation-policy/jetblue-airlines-cancellation-policy

Can My Jetblue Flight Be Changed for the Same Day

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