Is there a direct flight?

No, most flights require a connection.

How long is the drive?

Approximately 21 hours of driving time.

Amtrak's Texas Eagle stops in San Antonio.

Is San Antonio walkable?

The River Walk area is very walkable.

Fontana

San Antonio

Flight Driving

Fontana to San Antonio

Updated: 28 May 2026

The journey from Fontana to San Antonio covers approximately 1,400 miles. Flying is the most efficient option, connecting through Dallas or Phoenix. Driving follows I-10 east through the desert landscapes of Arizona, New Mexico, and West Texas. San Antonio is a historic city famous for the Alamo and its beautiful River Walk. Be prepared for long stretches of desert driving.

Total Distance: 2,250 km driving distance; 1,900 km straight-line air distance.

Fastest Way

Flight from Ontario (ONT) to San Antonio (SAT) takes about 5 hours.

Cheapest Way

Driving is the most cost-effective for groups.

Compare Fontana to San Antonio Routes

	Flight Connecting	Driving Direct
Duration	5 hours	21 hours
Avg Price	$200-$400	$300-$500
Operator	Southwest Airlines	Personal Vehicle
Route	ONT to SAT via PHX or DFW.	I-10 E.
Tip	Southwest offers excellent service to SAT.	I-10 is a long, straight drive across the desert.

Travel Tips

Airport Transit
Use a taxi or ride-share from SAT to downtown.
Dining
Try the local Tex-Mex cuisine; it is a regional staple.
Weather
San Antonio can be very hot in the summer; stay hydrated.
Navigation
I-10 is well-maintained; watch for speed traps in small towns.
Packing
Bring light, breathable clothing for the Texas heat.

Safety Tips

Road Safety
Watch for sandstorms on I-10 in the desert.
Urban Safety
San Antonio is generally safe, but use standard precautions at night.
Vehicle Prep
Check your radiator and coolant before driving in the desert heat.
Emergency Kit
Carry extra water and snacks for the long stretches of I-10.