Best Time to Drive from Fontana to San Marcos

Right now (6:06 pm PST): about 100 minutes via I-215 South and I-15 South, usually 88 at this time.

Only 40% of this drive is measured by working traffic sensors right now. The rest is estimated from nearby sensors, typical speeds and street traffic, so times can be off. Why so few sensors work.

About this drive

On weekdays the 79-mile drive from Fontana to San Marcos (via I-215 South and I-15 South) usually takes as little as 74 minutes and up to 100 minutes, when leaving around 4:30 pm on Thursdays. The fastest times to leave are before 5:30 am or after 7 pm. Midday (11 am to 2 pm) it takes about 79 minutes. On weekends it is slowest around 1:30 pm on Saturdays (84 minutes).

About 66 miles of it is freeway, where times follow typical and live traffic from our sensors, and about 13 miles surface streets (16 to 25 minutes on weekdays), estimated from how jammed the freeways around them are at that time. Drive times are measured from central Fontana to central San Marcos along the route on the map. Starting or ending elsewhere in a big city can add or save several minutes.

Simulated from typical freeway speeds at each point of the drive for the time you would reach it, from every 5-minute reading we have recorded. We don't have sensors on surface streets yet, so the time on them is estimated from how congested the freeways around each end of the drive are at that time, in both directions: streets jam when the freeways do.

Questions

What is the best time to drive from Fontana to San Marcos?

On weekdays, leave before 5:30 am or after 7 pm. The drive usually takes about 74 minutes then, versus up to 100 minutes at the worst times.

How long does it take to drive from Fontana to San Marcos?

The 79-mile drive usually takes 74 to 100 minutes on weekdays, depending on when you leave, and about 79 minutes midday.

When is traffic worst from Fontana to San Marcos?

Leaving around 4:30 pm on Thursdays is usually slowest, about 100 minutes.

Freeways on this drive

I-215 South in Inland Empire (34 miles) · I-15 South in San Diego (14 miles) · I-15 South in Inland Empire (10 miles) · SR-60 East in Inland Empire (8 miles)

Inland Empire traffic right now · Inland Empire traffic tomorrow · San Diego traffic right now · San Diego traffic tomorrow

More drives

San Marcos to Fontana (return trip) · Fontana to Los Angeles · Fontana to Long Beach · Fontana to Anaheim · Fontana to Santa Ana · Fontana to Irvine · Fontana to San Bernardino · Fontana to Moreno Valley · Fontana to Huntington Beach · Fontana to Glendale · Fontana to Santa Clarita · Fontana to Oceanside

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