Best Time to Drive from Ontario to San Marcos

Right now (12:23 am PST): about 77 minutes via I-15 South.

Only 28% 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.

Typical drive time by departure time

Minutes from Ontario to San Marcos by day and time you leave (local time)
Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	80	97	92	89	84	85	82	83	82	84	91	94	91	84	79	78	77
Tue	80	99	96	96	86	85	83	82	81	83	90	94	94	90	79	78	76
Wed	80	99	95	92	87	84	82	81	82	85	89	94	96	88	80	78	77
Thu	79	100	93	92	84	83	83	82	83	87	95	101	100	90	80	78	77
Fri	78	83	84	86	83	83	83	86	93	101	107	105	101	97	86	80	77
Sat	77	77	78	78	80	86	96	96	94	90	89	87	85	83	81	80	77
Sun	77	77	77	77	78	79	80	81	81	80	80	79	79	79	79	79	76

About this drive

On weekdays the 82-mile drive from Ontario to San Marcos (via I-15 South) usually takes as little as 76 minutes and up to 107 minutes, when leaving around 3 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 84 minutes. On weekends it is slowest around 11:30 am on Saturdays (97 minutes).

About 70 miles of it is freeway, where times follow typical and live traffic from our sensors, and about 12 miles surface streets (14 to 22 minutes on weekdays), estimated from how jammed the freeways around them are at that time. Drive times are measured from central Ontario 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 Ontario to San Marcos?

On weekdays, leave before 5:30 am or after 7 pm. The drive usually takes about 76 minutes then, versus up to 107 minutes at the worst times.

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

The 82-mile drive usually takes 76 to 107 minutes on weekdays, depending on when you leave, and about 84 minutes midday.

When is traffic worst from Ontario to San Marcos?

Leaving around 3 pm on Fridays is usually slowest, about 107 minutes.

Freeways on this drive

I-15 South in Inland Empire (34 miles) · I-15 South in Orange County (20 miles) · I-15 South in San Diego (14 miles) · SR-60 East in Inland Empire (2 miles)

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

More drives

San Marcos to Ontario (return trip) · Ontario to Los Angeles · Ontario to Santa Monica · Ontario to Pasadena · Ontario to Long Beach · Ontario to West Covina · Ontario to Burbank · Ontario to Glendale · Ontario to Santa Clarita · Ontario to Van Nuys · Ontario to Torrance · Ontario to LAX

Open the live traffic map →

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	80	97	92	89	84	85	82	83	82	84	91	94	91	84	79	78	77
Tue	80	99	96	96	86	85	83	82	81	83	90	94	94	90	79	78	76
Wed	80	99	95	92	87	84	82	81	82	85	89	94	96	88	80	78	77
Thu	79	100	93	92	84	83	83	82	83	87	95	101	100	90	80	78	77
Fri	78	83	84	86	83	83	83	86	93	101	107	105	101	97	86	80	77
Sat	77	77	78	78	80	86	96	96	94	90	89	87	85	83	81	80	77
Sun	77	77	77	77	78	79	80	81	81	80	80	79	79	79	79	79	76

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	80	97	92	89	84	85	82	83	82	84	91	94	91	84	79	78	77
Tue	80	99	96	96	86	85	83	82	81	83	90	94	94	90	79	78	76
Wed	80	99	95	92	87	84	82	81	82	85	89	94	96	88	80	78	77
Thu	79	100	93	92	84	83	83	82	83	87	95	101	100	90	80	78	77
Fri	78	83	84	86	83	83	83	86	93	101	107	105	101	97	86	80	77
Sat	77	77	78	78	80	86	96	96	94	90	89	87	85	83	81	80	77
Sun	77	77	77	77	78	79	80	81	81	80	80	79	79	79	79	79	76

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	80	97	92	89	84	85	82	83	82	84	91	94	91	84	79	78	77
Tue	80	99	96	96	86	85	83	82	81	83	90	94	94	90	79	78	76
Wed	80	99	95	92	87	84	82	81	82	85	89	94	96	88	80	78	77
Thu	79	100	93	92	84	83	83	82	83	87	95	101	100	90	80	78	77
Fri	78	83	84	86	83	83	83	86	93	101	107	105	101	97	86	80	77
Sat	77	77	78	78	80	86	96	96	94	90	89	87	85	83	81	80	77
Sun	77	77	77	77	78	79	80	81	81	80	80	79	79	79	79	79	76