Distance from Chiang Mai (CNX) to Udon Thani (UTH)
Great-circle flight distance, flight time & route type — computed from real airport coordinates.
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Quick answer: Chiang Mai to Udon Thani distance at a glance
Flight distance from Chiang Mai (CNX) to Udon Thani (UTH) is 269 miles (433 km, 234 nm) great-circle using real OpenFlights coordinates, with an estimated nonstop time of 45m and route type short-haul domestic. Coordinates are 18.77°, 98.96° → 17.39°, 102.79°, bearing 110° east from haversine formula.
Facts computed from OpenFlights — not estimated. See methodology below.
The great-circle distance from Chiang Mai (CNX, Thailand) to Udon Thani (UTH, Thailand) is 269 miles (433 kilometers, 234 nautical miles). This is the shortest path a plane could fly between the two airports, measured along the surface of the Earth using the haversine formula on the airports' real published coordinates (18.77°, 98.96° for CNX; 17.39°, 102.79° for UTH). A nonstop flight on this route is estimated to take about 45 minutes, assuming a typical cruise ground speed of 500 mph including climb-out and descent. The destination lies roughly east of the origin (initial bearing 110°), placing the midpoint of this route near coordinates (18.08°, 100.88°).
By route type, this is a short-haul domestic flight. Short-haul routes are typically served by narrowbody jets and regional turboprops, and nonstop service is common between major cities. The destination's solar time zone is 0 hour the same as the origin (see our time zone tool for the full breakdown). Estimated carbon footprint per passenger is about 24 kg CO₂ in economy, and the route difficulty score is 1/10.
Great-circle route from Chiang Mai (CNX, 18.77°, 98.96°) to Udon Thani (UTH, 17.39°, 102.79°). The dashed line is the shortest path between the two airports on the Earth's surface — the path a nonstop flight would follow. The midpoint at (18.08°, 100.88°) gives a sense of which region the flight overflies.
How this distance is calculated
TripRoute computes the great-circle distance between two airports using the haversine formula applied to each airport's published latitude and longitude from the public OpenFlights airports.dat dataset (the same data that powers airline route maps worldwide). The haversine formula accounts for the curvature of the Earth, so the result is the true shortest distance along the surface — not a straight line on a flat map. We express it in statute miles (269 mi), kilometers (433 km, conversion factor 1.60934), and nautical miles (234 nm, factor 0.868976). The estimated flight time assumes a ground speed of 500 mph including the climb and descent phases, which is a reasonable average for subsonic commercial jets — actual flight time varies with winds, routing, and the specific aircraft type. The compass direction (east, bearing 110°) is the initial great-circle bearing from origin to destination; the path curves slightly because of the Earth's curvature on long sectors.
TRWhen distance matters most for CNX → UTH
At 269 miles this is a train-or-plane decision — compare door-to-door time, not just air distance. Where rail exists on the corridor, it often beats flying once airport security time is counted.
Guidance derived from the computed great-circle distance and category bands.
Chiang Mai to Udon Thani — quick answers
How far is Chiang Mai from Udon Thani by plane?
The nonstop flight distance from CNX (Chiang Mai) to UTH (Udon Thani) is 269 miles (433 km, 234 nautical miles), measured as a great-circle line across Earth's surface using the airports' published coordinates. This haversine calculation accounts for Earth's curvature and matches airline navigation charts; actual flown distance is slightly longer due to airways and winds.
How long does it take to fly from Chiang Mai to Udon Thani?
Estimated nonstop flight time is 45 minutes, assuming a typical jet cruise speed of about 500 mph including climb and descent. Gate-to-gate time is usually 20–35 minutes longer for taxi and air-traffic routing, and connecting itineraries add 1–4 hours depending on layover length and airport connection efficiency.
Is CNX to UTH a short, medium, or long-haul flight?
This is a short-haul domestic flight (269 miles). Short-haul routes are typically flown by narrowbody jets and regional aircraft with frequent nonstop service. Flight categories follow industry distance bands that predict aircraft type and service level, so you can anticipate cabin options and connection likelihood.