Is it better to fly or drive?

Flying is faster, but driving is cheaper for groups.

How long is the flight?

The flight time is approximately 1 hour and 20 minutes.

What is the best route by car?

I-5 South is the standard and most efficient route.

Amtrak exists but requires a long, multi-leg journey not recommended for this route.

What is the distance?

It is approximately 600 kilometers by road.

San Carlos

Ontario

Flight Driving

San Carlos to Ontario

Updated: 31 May 2026

The trip from San Carlos to Ontario covers roughly 600 kilometers, primarily via I-5 South. This is a major transit corridor connecting Northern and Southern California. Driving takes approximately 6 hours without stops. Alternatively, you can fly from San Francisco International Airport (SFO) to Ontario International Airport (ONT). This route passes through the Central Valley, offering a stark contrast between coastal and inland landscapes.

Total Distance: 600 km driving, 550 km air distance.

Fastest Way

Flying from SFO to ONT takes 1 hour 20 minutes in the air, plus airport transit time.

Cheapest Way

Driving is the most economical choice, especially if traveling with passengers.

Compare San Carlos to Ontario Routes

	Flight Direct	Driving Direct
Duration	1 hour 20 mins	6 hours
Avg Price	150-300 USD	60-80 USD
Operator	Southwest Airlines	Personal Vehicle
Route	SFO to ONT.	I-5 South to CA-58 East to I-15 South.
Tip	Book at least two weeks in advance for the best fares.	Stop in Kettleman City for a wide variety of food and charging stations.

Travel Tips

Fuel Stops
Fill up in the Central Valley where gas prices are often lower than in the Bay Area.
Traffic
Avoid the Grapevine section of I-5 during holiday weekends due to heavy traffic.
Airport Transit
Use ride-sharing apps for quick transport from ONT to your final destination.
Hydration
Keep water in your vehicle, as the inland climate is very dry.
Booking
Check flight prices on multiple aggregators to find the best deal.

Safety Tips

Heat Safety
Check your cooling system before driving through the Central Valley in summer.
Tire Pressure
High temperatures can affect tire pressure; check it before your trip.
Visibility
Dust storms can occur in the Inland Empire; slow down if visibility drops.
Rest Stops
Use designated rest areas on I-5 to prevent driver fatigue.