K1S1 · Porthill, Idaho
Eckhart International Airport
K1S1March 25, 2026 · K1S1-1125
Operational Summary
- U.S. Customs Service
- Yes
- User Fee
- Unknown
- Office Hours
- Daily07:00-19:00
Pacific Time
- Service Hours
- Daily07:00-19:00Inspection services
Pacific Time
- Parking
- Grass ramp adjacent to the Porthill Port of Entry
- Permission to Land
- Required
- After Hours
- Not Available
Parking and Inspection
Where to Park
Grass ramp north of runway
Adjacent to the Porthill Port of Entry
Porthill Port of Entry
FIS location
Taxi north of the runway to park on the grass ramp adjacent to the Porthill Port of Entry.
Secure permission to land from CBP at least 2 hours before ETA.
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).
Procedures
Permission to Land
Obtain permission to land during office hours at least 2 hours before ETA; +/- 30 min tolerance.
Appointment
Unknown- 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
Departure
Commercial operators must obtain outbound clearance from CBP.
Operator Highlights
- Permission to land required
- Service hours 07:00-19:00 PT
- Processing inside FIS
- Commercial outbound clearance required
Contacts and Location
Customs Location Map
Related Resources for K1S1
Hours and Availability
Office Hours
- Daily07:00-19:00
Pacific Time
Source Wording
7 days, 07:00-19:00 PT
Service Hours
- Daily07:00-19:00Inspection services
Pacific Time
Source Wording
7 days, 07:00-19:00 PT
Availability
Not Available
Inspection services available 07:00-19:00 only.
- Permission to land required at least 2 hours prior; +/- 30 min tolerance
Remarks
- 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
Detected Topics
- Landing Rights
- Outbound Clearance
- Passenger Processing
Nearby Customs Airports Within 250 NM
Laurier, Washington
Hayden, Idaho
CBP facility
Spokane, Washington
Ramp next to CBP facility
Spokane, Washington
CBP inspection area (South Pilot Ramp), 8005 W. Pilot Drive, Spokane, WA 99224
Kalispell, Montana
CBP inspection area, 4170 Highway 2 East, Kalispell, MT 59901
Oroville, Washington
Airport ramp
Del Bonita, Montana
West end of runway parking, 4071 Chalk Butte Road, Cut Bank, MT 59427
Moses Lake, Washington
CBP facility, 7810 Andrews Street NE, Suite 101, Moses Lake, WA 98837
Cut Bank, Montana
CBP inspection area, 2705 Valier Hwy, Cut Bank, MT 59427
Sweetgrass, Montana
Great Falls, Montana
CBP ramp
Helena, Montana
CBP ramp
Burlington, Washington
CBP inspection area
Bellingham, Washington
CBP inspection area
Everett, Washington
Propeller Aero Services
Kenmore, Washington
Butte, Montana
Renton, Washington
Airport ramp, 616 West Perimeter Road, Renton, WA 98057
Anacortes, Washington
Seattle, Washington
Blue customs box (location 4)
Original Content
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