Best Time to Drive from San Marcos to Fontana

Right now (5:17 pm PDT): about 109 minutes via I-215 North and I-15 North, usually 92 at this time.

Only 62% 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 77-mile drive from San Marcos to Fontana (via I-215 North and I-15 North) usually takes as little as 73 minutes and up to 135 minutes, when leaving around 3:30 pm on Fridays. The fastest times to leave are before 5:30 am or after 7 pm. Midday (11 am to 2 pm) it takes about 92 minutes. On weekends it is slowest around 2:30 pm on Saturdays (95 minutes).

About 65 miles of it is freeway, where times follow typical and live traffic from our sensors, and about 12 miles surface streets (15 to 35 minutes on weekdays), estimated from how jammed the freeways around them are at that time. Drive times are measured from central San Marcos to central Fontana 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 San Marcos to Fontana?

On weekdays, leave before 5:30 am or after 7 pm. The drive usually takes about 73 minutes then, versus up to 135 minutes at the worst times.

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

The 77-mile drive usually takes 73 to 135 minutes on weekdays, depending on when you leave, and about 92 minutes midday.

When is traffic worst from San Marcos to Fontana?

Leaving around 3:30 pm on Fridays is usually slowest, about 135 minutes.

Freeways on this drive

I-215 North in Inland Empire (34 miles) · I-15 North in San Diego (19 miles) · I-15 North in Inland Empire (8 miles) · SR-60 West in Inland Empire (5 miles)

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

More drives

Fontana to San Marcos (return trip) · San Marcos to San Diego · San Marcos to Anaheim · San Marcos to Riverside · San Marcos to Santa Ana · San Marcos to Chula Vista · San Marcos to Irvine · San Marcos to San Bernardino · San Marcos to Moreno Valley · San Marcos to Huntington Beach

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