Best Time to Drive from Rancho Cucamonga to Lake Forest

Right now (7:36 pm PST): about 47 minutes via I-15 South and SR-241 South and SR-91 West, usually 47 at this time.

Only 46% 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 Rancho Cucamonga to Lake Forest 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	46	62	71	70	63	55	51	51	51	52	54	58	55	52	48	48	47
Tue	46	64	73	72	66	55	51	50	50	52	55	59	57	54	48	48	46
Wed	46	61	68	73	65	55	52	51	51	51	55	57	55	53	48	48	46
Thu	46	62	68	66	59	53	51	52	52	53	54	54	53	52	48	47	46
Fri	46	56	57	57	54	52	51	51	52	52	53	55	54	52	49	47	46
Sat	46	48	48	48	48	50	52	53	55	54	54	52	52	51	48	47	46
Sun	46	47	47	47	48	50	52	51	54	53	53	51	50	51	49	49	46

About this drive

On weekdays the 49-mile drive from Rancho Cucamonga to Lake Forest (via I-15 South and SR-241 South and SR-91 West) usually takes as little as 46 minutes and up to 76 minutes, when leaving around 7:30 am on Tuesdays. The fastest times to leave are before 6 am or after 6:30 pm. Midday (11 am to 2 pm) it takes about 51 minutes. On weekends it is slowest around 12:30 pm on Saturdays (55 minutes).

About 42 miles of it is freeway, where times follow typical and live traffic from our sensors, and about 6 miles surface streets (8 to 15 minutes on weekdays), estimated from how jammed the freeways around them are at that time. Drive times are measured from central Rancho Cucamonga to central Lake Forest 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 Rancho Cucamonga to Lake Forest?

On weekdays, leave before 6 am or after 6:30 pm. The drive usually takes about 46 minutes then, versus up to 76 minutes at the worst times.

How long does it take to drive from Rancho Cucamonga to Lake Forest?

The 49-mile drive usually takes 46 to 76 minutes on weekdays, depending on when you leave, and about 51 minutes midday.

When is traffic worst from Rancho Cucamonga to Lake Forest?

Leaving around 7:30 am on Tuesdays is usually slowest, about 76 minutes.

Freeways on this drive

SR-241 South in Orange County (16 miles) · I-15 South in Inland Empire (11 miles) · SR-91 West in Orange County (10 miles) · I-15 South in Orange County (6 miles)

Inland Empire traffic right now · Inland Empire traffic tomorrow · Orange County traffic right now · Orange County traffic tomorrow

More drives

Lake Forest to Rancho Cucamonga (return trip) · Rancho Cucamonga to Los Angeles · Rancho Cucamonga to Santa Monica · Rancho Cucamonga to Pasadena · Rancho Cucamonga to Long Beach · Rancho Cucamonga to West Covina · Rancho Cucamonga to Burbank · Rancho Cucamonga to Glendale · Rancho Cucamonga to Santa Clarita · Rancho Cucamonga to Van Nuys · Rancho Cucamonga to Torrance · Rancho Cucamonga 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	46	62	71	70	63	55	51	51	51	52	54	58	55	52	48	48	47
Tue	46	64	73	72	66	55	51	50	50	52	55	59	57	54	48	48	46
Wed	46	61	68	73	65	55	52	51	51	51	55	57	55	53	48	48	46
Thu	46	62	68	66	59	53	51	52	52	53	54	54	53	52	48	47	46
Fri	46	56	57	57	54	52	51	51	52	52	53	55	54	52	49	47	46
Sat	46	48	48	48	48	50	52	53	55	54	54	52	52	51	48	47	46
Sun	46	47	47	47	48	50	52	51	54	53	53	51	50	51	49	49	46

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	46	62	71	70	63	55	51	51	51	52	54	58	55	52	48	48	47
Tue	46	64	73	72	66	55	51	50	50	52	55	59	57	54	48	48	46
Wed	46	61	68	73	65	55	52	51	51	51	55	57	55	53	48	48	46
Thu	46	62	68	66	59	53	51	52	52	53	54	54	53	52	48	47	46
Fri	46	56	57	57	54	52	51	51	52	52	53	55	54	52	49	47	46
Sat	46	48	48	48	48	50	52	53	55	54	54	52	52	51	48	47	46
Sun	46	47	47	47	48	50	52	51	54	53	53	51	50	51	49	49	46

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	46	62	71	70	63	55	51	51	51	52	54	58	55	52	48	48	47
Tue	46	64	73	72	66	55	51	50	50	52	55	59	57	54	48	48	46
Wed	46	61	68	73	65	55	52	51	51	51	55	57	55	53	48	48	46
Thu	46	62	68	66	59	53	51	52	52	53	54	54	53	52	48	47	46
Fri	46	56	57	57	54	52	51	51	52	52	53	55	54	52	49	47	46
Sat	46	48	48	48	48	50	52	53	55	54	54	52	52	51	48	47	46
Sun	46	47	47	47	48	50	52	51	54	53	53	51	50	51	49	49	46