To avoid missing your flight to Jacksonville, FL, arrive at the airport at least 2 or 3 hours early for check-in, security controls, customs, and boarding. eDreams offers great deals on flights to Jacksonville, FL from over 3 cities. You can enhance your experience with services like priority boarding, extra luggage, and lounge access. Additionally, consider adding travel insurance or opting for a refundable fare when booking to ensure flexibility and peace of mind.