Best Time to Drive from Diamond Bar to Costa Mesa

Right now (3:20 pm PST): about 34 minutes via SR-57 South and SR-55 South, usually 33 at this time.

None 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 Diamond Bar to Costa Mesa 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	27	31	41	45	41	34	32	31	32	32	33	33	36	32	29	28	28
Tue	27	33	45	49	42	36	34	34	33	33	34	36	40	34	29	28	28
Wed	27	33	44	49	42	38	34	34	32	32	34	35	39	36	30	29	28
Thu	27	32	43	45	41	36	34	34	34	32	34	34	39	34	30	28	28
Fri	27	31	39	41	37	34	33	33	32	33	34	35	36	34	31	29	28
Sat	28	28	29	29	30	31	33	33	33	32	33	33	33	32	30	29	28
Sun	28	28	28	28	29	30	31	31	31	31	32	31	30	30	30	29	28

About this drive

On weekdays the 32-mile drive from Diamond Bar to Costa Mesa (via SR-57 South and SR-55 South) usually takes as little as 27 minutes and up to 51 minutes, when leaving around 7:30 am on Wednesdays. The fastest times to leave are before 6 am or after 7:30 pm. Midday (11 am to 2 pm) it takes about 33 minutes. On weekends it is slowest around 12:30 pm on Saturdays (34 minutes).

About 31 miles of it is freeway, where times follow typical and live traffic from our sensors, and about 0.8 miles surface streets (1 to 2 minutes on weekdays), estimated from how jammed the freeways around them are at that time. Drive times are measured from central Diamond Bar to central Costa Mesa 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 Diamond Bar to Costa Mesa?

On weekdays, leave before 6 am or after 7:30 pm. The drive usually takes about 27 minutes then, versus up to 51 minutes at the worst times.

How long does it take to drive from Diamond Bar to Costa Mesa?

The 32-mile drive usually takes 27 to 51 minutes on weekdays, depending on when you leave, and about 33 minutes midday.

When is traffic worst from Diamond Bar to Costa Mesa?

Leaving around 7:30 am on Wednesdays is usually slowest, about 51 minutes.

Freeways on this drive

SR-57 South in Orange County (12 miles) · SR-55 South in Orange County (8 miles) · SR-57 South in Los Angeles (5 miles) · I-5 South in Orange County (4 miles) · SR-60 West in Los Angeles (1.4 miles)

Los Angeles traffic right now · Los Angeles traffic tomorrow · Orange County traffic right now · Orange County traffic tomorrow

More drives

Costa Mesa to Diamond Bar (return trip) · Diamond Bar to Los Angeles · Diamond Bar to Long Beach · Diamond Bar to Anaheim · Diamond Bar to Riverside · Diamond Bar to Santa Ana · Diamond Bar to Irvine · Diamond Bar to San Bernardino · Diamond Bar to Fontana · Diamond Bar to Moreno Valley · Diamond Bar to Huntington Beach · Diamond Bar to Glendale

Open the live traffic map →

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	27	31	41	45	41	34	32	31	32	32	33	33	36	32	29	28	28
Tue	27	33	45	49	42	36	34	34	33	33	34	36	40	34	29	28	28
Wed	27	33	44	49	42	38	34	34	32	32	34	35	39	36	30	29	28
Thu	27	32	43	45	41	36	34	34	34	32	34	34	39	34	30	28	28
Fri	27	31	39	41	37	34	33	33	32	33	34	35	36	34	31	29	28
Sat	28	28	29	29	30	31	33	33	33	32	33	33	33	32	30	29	28
Sun	28	28	28	28	29	30	31	31	31	31	32	31	30	30	30	29	28

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	27	31	41	45	41	34	32	31	32	32	33	33	36	32	29	28	28
Tue	27	33	45	49	42	36	34	34	33	33	34	36	40	34	29	28	28
Wed	27	33	44	49	42	38	34	34	32	32	34	35	39	36	30	29	28
Thu	27	32	43	45	41	36	34	34	34	32	34	34	39	34	30	28	28
Fri	27	31	39	41	37	34	33	33	32	33	34	35	36	34	31	29	28
Sat	28	28	29	29	30	31	33	33	33	32	33	33	33	32	30	29	28
Sun	28	28	28	28	29	30	31	31	31	31	32	31	30	30	30	29	28

Leave	5am	6am	7am	8am	9am	10am	11am	12pm	1pm	2pm	3pm	4pm	5pm	6pm	7pm	8pm	9pm
Mon	27	31	41	45	41	34	32	31	32	32	33	33	36	32	29	28	28
Tue	27	33	45	49	42	36	34	34	33	33	34	36	40	34	29	28	28
Wed	27	33	44	49	42	38	34	34	32	32	34	35	39	36	30	29	28
Thu	27	32	43	45	41	36	34	34	34	32	34	34	39	34	30	28	28
Fri	27	31	39	41	37	34	33	33	32	33	34	35	36	34	31	29	28
Sat	28	28	29	29	30	31	33	33	33	32	33	33	33	32	30	29	28
Sun	28	28	28	28	29	30	31	31	31	31	32	31	30	30	30	29	28