How early can you file a flight plan?

• A. As early as you want, but at least 30 minutes prior to flight.
• B. Only 2 hours before.
• C. After engine start.
• D. Upon arrival.

Answer: (A)

Filing a flight plan is done before you depart to inform air traffic control of your route, altitude, and timing so they can provide separation and assist in an emergency if needed. You can file it whenever you like in advance, but there’s a practical minimum: at least 30 minutes before your planned departure. This lead time gives ATC enough to process the plan, assign clearances, and coordinate with other traffic. Filing earlier is fine, but filing after engine start or upon arrival would defeat the purpose of coordinating the flight in advance.