PHN in 20 seconds
St Clair County International Airport (IATA: PHN, ICAO: KPHN) serves Port Huron, US.
The St. Clair County International Airport (KPHN), also known as PHN, is a publicly-owned, operational airport located 5 miles southwest of Port Huron, Michigan, USA,,. It is open to the public and was activated in November 1951,.
- Runway Information: The airport has a main runway (04/22) that is 5,104 x 100 feet (1556 x 30 meters) with an asphalt/grooved surface and high-intensity edge lighting,. There is also another runway (10/28) with a non-precision instrument marking.
- Facilities and Services: KPHN offers 100LL and Jet A+ fuel, hangars, tiedowns, and major airframe and powerplant services,. It has a lighted wind indicator and a segmented circle.
- International Operations: It is designated as an International Airport of Entry,. Aircraft entering the US must notify US Customs one hour prior to entry.
- Management: The airport is owned by Saint Clair County and managed by Catherine Fiore,.
- Current Status: The airport is operational, but an active construction notice is in effect. There is no air traffic control tower.
*Sources researched: nfdc.faa.gov, airnav.com, cbp.gov, skyvector.com*
AirportRoutes · updated Jun 14, 2026
Traveler reviews & tips
From people who've recently flown through Port Huron.
Rate this airport:
No tips for PHN yet — be the first to help fellow travelers.
Share your tip or review
Help fellow travelers at St Clair County International Airport. Tips are reviewed before publishing.
Common questions about PHN
Quick answers, straight from the schedule data.
Where is St Clair County International Airport located?
St Clair County International Airport is located in Port Huron, US, at an elevation of 650 ft. Its IATA code is PHN and ICAO code is KPHN.