Florida Keys Marathon Airport

9400 Overseas Highway, Marathon, FL 33050
General Aviation Airport Fact Sheet 
Marathon International Airport (KMTH)
Regular Office Hours 
Thursday-Monday, 0900-1730 
Eastern Time (ET)  
 
 
  
 
 
 
 
Contact Information 
(305) 289-2029   CBP Marathon Office
KMTH_GAP@cbp.dhs.gov
Hours of Service for Entrance 
and Clearance 
Inspection services for the entrance/
arrival of aircraft at Marathon 
International Airport are available 
Thursday- Monday, 0930-1700 in 
accordance with the port's 
permission to land procedures.
Commercial aircraft operators 
departing the U.S. must obtain an 
outbound clearance by contacting 
CBP directly. 
Permission to Land Procedures 
Marathon International Airport (KMTH) is designated as a 
“user fee airport” [19 CFR 122.1(m);19 CFR 122.15]. 
Pilots must secure permission to land by contacting CBP 
during regular office hours, prior to departure from the 
foreign port or place.
Permission to land is granted with a tolerance of (+/-) 
30 minutes.  If your ETA deviates outside those 
parameters, Previously granted permission(s) are invalid 
and you must contact CBP to re-secure permission to land. 
Inspection Process 
• Aircraft should park in the CBP box.
• The FIS is not attached to the FBO or main terminal.
• A CBP Officer will meet the aircraft on the ramp to begin the inspection.
• All crew and passengers will be processed inside the FIS.
• Be prepared to present passports, visas, pilot’s license, medical certificate, aircraft
registration, and user fee decal (if appropriate).
• Regulated waste/garbage will be collected by CBP from the aircraft crew.
• Passengers can depart directly from FIS at the conclusion of their inspection or with the
aircraft.
Special Procedures/Miscellaneous 
• the FBO for Marathon is Million Air (305) 743-1995.
NOTE: For further detailed information regarding national GA processing standards and procedures, 
please refer to the CBP Private Aircraft Arrival Information Document or contact GAsupport@cbp.dhs.gov 
March 3, 2026 Publication Number KMTH-0326 
Marathon International Airport (KMTH)