To avoid missing your flight to Hanoi, 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 Hanoi from over 60 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.