Best Time to Drive from South San Francisco to Brentwood

Right now (12:51 am PST): about 66 minutes via SR-4 East and I-80 East.

Only 66% 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 South San Francisco to Brentwood 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	65	68	69	76	78	72	72	72	72	74	84	87	90	81	69	67	66
Tue	65	68	69	77	80	72	72	72	72	75	89	96	101	89	72	68	66
Wed	65	68	70	77	80	74	71	72	72	75	88	97	105	90	74	69	66
Thu	65	68	70	77	78	73	70	71	71	75	87	95	102	90	75	69	67
Fri	65	68	69	73	73	73	73	74	75	81	94	100	97	86	73	69	66
Sat	66	65	65	66	66	67	70	72	74	73	74	74	73	70	69	69	66
Sun	65	65	65	65	66	67	67	69	71	72	71	72	70	69	70	69	66

About this drive

On weekdays the 70-mile drive from South San Francisco to Brentwood (via SR-4 East and I-80 East) usually takes as little as 65 minutes and up to 105 minutes, when leaving around 5 pm on Wednesdays. The fastest times to leave are before 8 am or after 7:30 pm. Midday (11 am to 2 pm) it takes about 73 minutes. On weekends it is slowest around 3:30 pm on Saturdays (74 minutes).

About 61 miles of it is freeway, where times follow typical and live traffic from our sensors, and about 8 miles surface streets (11 to 14 minutes on weekdays), estimated from how jammed the freeways around them are at that time. Drive times are measured from central South San Francisco to central Brentwood 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 South San Francisco to Brentwood?

On weekdays, leave before 8 am or after 7:30 pm. The drive usually takes about 65 minutes then, versus up to 105 minutes at the worst times.

How long does it take to drive from South San Francisco to Brentwood?

The 70-mile drive usually takes 65 to 105 minutes on weekdays, depending on when you leave, and about 73 minutes midday.

When is traffic worst from South San Francisco to Brentwood?

Leaving around 5 pm on Wednesdays is usually slowest, about 105 minutes.

Freeways on this drive

SR-4 East in Bay Area (26 miles) · I-80 East in Bay Area (25 miles) · US-101 North in Bay Area (10 miles)

Bay Area traffic right now · Bay Area traffic tomorrow

More drives

Brentwood to South San Francisco (return trip) · South San Francisco to Stockton · South San Francisco to Santa Rosa · South San Francisco to Concord · South San Francisco to Vallejo · South San Francisco to Fairfield · South San Francisco to Antioch · South San Francisco to San Mateo · South San Francisco to Vacaville · South San Francisco to San Leandro · South San Francisco to Livermore · South San Francisco to Tracy

Open the live traffic map →

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	65	68	69	76	78	72	72	72	72	74	84	87	90	81	69	67	66
Tue	65	68	69	77	80	72	72	72	72	75	89	96	101	89	72	68	66
Wed	65	68	70	77	80	74	71	72	72	75	88	97	105	90	74	69	66
Thu	65	68	70	77	78	73	70	71	71	75	87	95	102	90	75	69	67
Fri	65	68	69	73	73	73	73	74	75	81	94	100	97	86	73	69	66
Sat	66	65	65	66	66	67	70	72	74	73	74	74	73	70	69	69	66
Sun	65	65	65	65	66	67	67	69	71	72	71	72	70	69	70	69	66

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	65	68	69	76	78	72	72	72	72	74	84	87	90	81	69	67	66
Tue	65	68	69	77	80	72	72	72	72	75	89	96	101	89	72	68	66
Wed	65	68	70	77	80	74	71	72	72	75	88	97	105	90	74	69	66
Thu	65	68	70	77	78	73	70	71	71	75	87	95	102	90	75	69	67
Fri	65	68	69	73	73	73	73	74	75	81	94	100	97	86	73	69	66
Sat	66	65	65	66	66	67	70	72	74	73	74	74	73	70	69	69	66
Sun	65	65	65	65	66	67	67	69	71	72	71	72	70	69	70	69	66

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	65	68	69	76	78	72	72	72	72	74	84	87	90	81	69	67	66
Tue	65	68	69	77	80	72	72	72	72	75	89	96	101	89	72	68	66
Wed	65	68	70	77	80	74	71	72	72	75	88	97	105	90	74	69	66
Thu	65	68	70	77	78	73	70	71	71	75	87	95	102	90	75	69	67
Fri	65	68	69	73	73	73	73	74	75	81	94	100	97	86	73	69	66
Sat	66	65	65	66	66	67	70	72	74	73	74	74	73	70	69	69	66
Sun	65	65	65	65	66	67	67	69	71	72	71	72	70	69	70	69	66