Need help booking?
Unpublished phone-only deals available
DEC to PHN: distance & flight time
Decatur (Decatur Airport) → Port Huron (St Clair County International Airport)
391 mi
629 km · 340 nm
1h 30m
estimated nonstop flight time
+1h
time difference · heading northeast
See live DEC→PHN fares Phone-only fares on this route — call free
Flight time details
391 miles nonstop takes roughly 1h 30m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time gain when reading arrival times on your ticket.
The two airports
- DEC — Decatur Airport · Decatur, United States
- PHN — St Clair County International Airport · Port Huron, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near DEC
Near PHN
Frequently asked questions
How far is DEC from PHN?
The flight distance from Decatur (DEC) to Port Huron (PHN) is 391 miles (629 km, 340 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from DEC to PHN?
A nonstop flight takes about 1h 30m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Decatur and Port Huron?
Port Huron is 1 hour ahead of Decatur.
What is the cheapest way to fly from DEC to PHN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on DEC–PHN that never appear on search engines, with no booking fees.