Is there a train to San Diego?

Amtrak's Pacific Surfliner runs along the coast, but you must get to LA first.

What is the best airport?

San Diego International (SAN) is the primary airport and is very close to downtown.

How long is the drive?

It takes about 27 hours of driving time, usually split over three days.

Yes, San Diego is a car-centric city and public transit does not cover all areas.

Yes, the route is well-traveled, but be prepared for desert conditions and mountain passes.

O'Fallon

San Diego

Flight Driving

O'Fallon to San Diego

Updated: 28 May 2026

The trip from O'Fallon to San Diego covers approximately 1,800 miles. You can fly from St. Louis Lambert (STL) to San Diego International (SAN) in about 4 hours. Driving involves taking I-70 West to I-15 South, crossing the Rockies and the Mojave Desert. This is a major cross-country journey that requires careful planning for fuel and rest stops. San Diego offers a beautiful coastal climate and a relaxed atmosphere.

Total Distance: 2,896 km driving, 2,400 km air distance.

Fastest Way

A direct flight from STL to SAN takes 4 hours, saving you over a full day of travel.

Cheapest Way

Flying is often the most cost-effective when factoring in the cost of fuel, hotels, and food for a multi-day drive.

Compare O'Fallon to San Diego Routes

	Flight Direct	Driving Direct
Duration	4 hours	27 hours
Avg Price	$190 - $550	$350 - $600 in fuel
Operator	Southwest Airlines	Personal Vehicle
Route	STL to SAN	I-70 W to I-15 S
Tip	SAN is located right in the city, making it very convenient for reaching downtown.	Ensure your vehicle is ready for high-speed desert driving and extreme heat.

Travel Tips

Traffic
Avoid driving on San Diego freeways during rush hours (7-9 AM and 4-6 PM) to save time.
Public Transit
Use the Trolley system to navigate between major hubs like Downtown, Old Town, and Mission Valley.
Parking
Parking in popular areas like La Jolla or the Gaslamp Quarter can be difficult; use parking apps.
Coastal Weather
The coast is often cooler than inland areas; bring layers even in the summer.
Reservations
Book popular restaurants and attractions like the San Diego Zoo well in advance.

Safety Tips

Vehicle Security
Never leave valuables in your car, especially in tourist-heavy areas like the beach or downtown.
Emergency
Keep a list of local emergency numbers and a physical map in your car for remote desert stretches.
Sun Exposure
The California sun is strong; wear protection even on cloudy days at the beach.
Pedestrian Safety
Be cautious when walking in busy areas; always use crosswalks and obey traffic signals.