Distance from Dadonghai to Haikou
How far is it from Dadonghai to Haikou? About 137 mi in a straight line and 178 mi by road. Driving time, flight time, midpoint and route details.
Dadonghai and Haikou are about 137 mi (221 km) apart in a straight line. By road that works out to roughly 178 mi (287 km), a drive of about 3 hr 11 min. A nonstop flight covers the great-circle distance in approximately 45 min.
| Straight-line distance | 137 mi / 221 km |
| Road distance (est.) | 178 mi / 287 km |
| Driving time (est.) | 3 hr 11 min |
| Nonstop flight (est.) | 45 min |
| Driving fuel (est., 1-way) | $22 |
| Typical flight fare | $80–$250 |
| Geographic midpoint | 19.134, 109.924 |
How these estimates work
Straight-line distance uses the haversine formula on each city's coordinates. Road distance applies a circuity factor (~1.2–1.4×) and driving time a blended average speed. Flight time uses typical jet cruise speed plus ~30 minutes for taxi, climb and descent. Treat all figures as planning estimates.
Frequently asked questions
Dadonghai to Haikou is about 137 mi (221 km) in a straight line, and roughly 178 mi (287 km) by road.