Distance From Samui Airport to Ontario International Airport, USM - ONT Distance

The distance from Samui Airport (USM) to Ontario International Airport (ONT) is 8542 miles or 13747 kilometers or 7418 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

---

How long does it take to travel from Na Thon (Ko Samui Island) ( Thailand ) to Ontario ( United States )?

A one-way nonstop (direct) flight between Na Thon (Ko Samui Island) and Ontario takes around 19 hours 38 minutes.

Estimated flight time from Samui Airport, Na Thon (Ko Samui Island), Thailand to Ontario International Airport, Ontario, United States is 19 hours 38 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • USM - ONT

Kilometers		13747 km
Statute Miles		8542 miles
Nautical Miles		7418 nm
Avg. Time of Flight		19 hours 38 minutes

Samui Airport to Ontario International Airport Flight Route Map - USM to ONT Flight Path

Location of Samui Airport & Ontario International Airport is given below.
Click the map to view Na Thon (Ko Samui Island) to Ontario nonstop flight path and travel direction.

Click to see flight route on Google Map between Na Thon (Ko Samui Island), Thailand and Ontario, United States. .

Nonstop flight route between Na Thon (Ko Samui Island), Thailand and Ontario, United States.

Time Difference Between the Airports • USM - ONT

Time difference between Na Thon (Ko Samui Island) (Thailand) and Ontario (United States) is 14 Hours.
Ontario time is 14 Hours behind Na Thon (Ko Samui Island).

Location	Local Time
Na Thon (Ko Samui Island) (Thailand)	2026-09-15, 12:35:18 +07
Ontario (United States)	2026-09-14, 22:35:18 PDT

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

Samui Airport (USM / VTSM) Na Thon (Ko Samui Island), Thailand

Destination

Ontario International Airport (ONT / KONT) Ontario, United States