Is San Diego expensive?

It is one of the more expensive cities in the US for dining and lodging.

What is the best time to visit?

September and October offer warm weather and fewer crowds.

Do I need a car in San Diego?

A car is highly recommended to explore the diverse neighborhoods.

Are there direct flights from STL?

Most flights to San Diego from St. Louis require a connection.

What is the weather like?

Expect a Mediterranean climate with mild temperatures year-round.

Mt Vernon

San Diego

Flight Driving

Mt Vernon to San Diego

Updated: 28 May 2026

Traveling from Mt Vernon to San Diego covers over 2,900 kilometers. The most practical approach is driving to St. Louis Lambert International Airport for a flight to San Diego International Airport. If you prefer driving, the route follows I-64 West to I-44 West, eventually connecting to I-40 West across the Southwest. This is a multi-day journey requiring careful planning for fuel and lodging stops.

Total Distance: 2,950 km driving, 2,600 km air distance.

Fastest Way

Flying from St. Louis is the fastest way to reach San Diego.

Cheapest Way

Driving is generally cheaper for groups, while flying is more cost-effective for solo travelers.

Compare Mt Vernon to San Diego Routes

	Flight Connecting	Driving Direct
Duration	7 hours	28 hours
Avg Price	$400-$700	$450-$600 in fuel
Operator	Southwest Airlines	Personal Vehicle
Route	STL to SAN via Las Vegas or Phoenix.	I-64 W to I-44 W to I-40 W.
Tip	Check Southwest for two free checked bags to save on costs.	Plan for at least three nights of lodging along the route.

Travel Tips

Airport
San Diego International Airport is located very close to downtown.
Traffic
Avoid commuting on I-5 during rush hours to save significant time.
Sun Protection
The California sun is strong; wear sunscreen even on cloudy days.
Public Transit
Use the San Diego Trolley to navigate between major tourist hubs.
Booking
Book hotels in the Gaslamp Quarter for easy access to nightlife.