Eckhart International Airport

General Aviation Airport Fact Sheet 
Eckhart International Airport (K1S1) 
Porthill, ID 83853 
Regular Office Hours 
7 days per week, 0700-1900 
Pacific Time (PT)  
 
 
  
 
 
 
 
Contact Information 
(208) 267-5309   CBP Porthill, ID Port of Entry 
(406) 335-9610   CBP Sweetgrass, MT POE 
K1S1_GAP@cbp.dhs.gov
Hours of Service for Entrance 
and Clearance 
Inspection services for the entrance/
arrival of aircraft at Eckhart 
International Airport are available 7 
days per week, 0700-1900 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 
Pilots must secure permission to land by contacting CBP 
directly, during regular office hours, prior to departure 
from the foreign port or place and at least otwo hours in 
advance of the anticipated arrival time at K1S1.  
Permission to land is granted with a tolerance of (+/-) 30 
minutes. If your ETA deviates outside these parameters, 
previously granted permission(s) are invalid and you 
must contact CBP to re-secure permission to land.  
Inspection Process 
• Aircraft should taxi north of the runway to park on the grass ramp adjacent to the Porthill Port of Entry.
• 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).
Special Procedures/Miscellaneous 
• Porthill Port of Entry regular office hours: Current Hours: 7 days per week 0700-1900
• Sweetgrass Port of Entry operates 24 hours per day, 7 days per week.
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 
November 10, 2025 Publication Number K1S1-1125 
Eckhart International Airport