Distance From Guernsey Airport to Ontario International Airport, GCI - ONT Distance

The distance from Guernsey Airport (GCI) to Ontario International Airport (ONT) is 5431 miles or 8740 kilometers or 4716 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.

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How long does it take to travel from Saint Peter Port ( Guernsey ) to Ontario ( United States )?

A one-way nonstop (direct) flight between Saint Peter Port and Ontario takes around 12 hours 29 minutes.

Estimated flight time from Guernsey Airport, Saint Peter Port, Guernsey to Ontario International Airport, Ontario, United States is 12 hours 29 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 • GCI - ONT

Kilometers		8740 km
Statute Miles		5431 miles
Nautical Miles		4716 nm
Avg. Time of Flight		12 hours 29 minutes

Guernsey Airport to Ontario International Airport Flight Route Map - GCI to ONT Flight Path

Location of Guernsey Airport & Ontario International Airport is given below.
Click the map to view Saint Peter Port to Ontario nonstop flight path and travel direction.

Click to see flight route on Google Map between Saint Peter Port, Guernsey and Ontario, United States. .

Nonstop flight route between Saint Peter Port, Guernsey and Ontario, United States.

Time Difference Between the Airports • GCI - ONT

Time difference between Saint Peter Port (Guernsey) and Ontario (United States) is 8 Hours.
Ontario time is 8 Hours behind Saint Peter Port.

Location	Local Time
Saint Peter Port (Guernsey)	2025-12-16, 03:55:19 GMT
Ontario (United States)	2025-12-15, 19:55:19 PST

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

Guernsey Airport (GCI / EGJB) Saint Peter Port, Guernsey

Destination

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