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Trip from Diamond Bar, CA to Fontana, CA

Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 19, 2026 · Editorial standards

Drive Time

32m

Distance

26.5 mi

43 km

Drive Score

6/10

Good drive

Same Day?

Yes, doable

Fuel Cost

$6

one way

EV Charging

Good

8 stations

Best Time to Leave

Save up to 8 min
4 AM
0h 30m ★
6 AM
0h 32m
8 AM
0h 38m
10 AM
0h 34m
12 PM
0h 34m
3 PM
0h 34m
5 PM
0h 38m
8 PM
0h 31m

Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.

Best Time Drive vs Fly
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city ​​in eastern Los Angeles County, California, United States

Diamond Bar, CA

Wikimedia Commons

Downtown Fontana, CA, CA

Fontana, CA

Wikimedia Commons

Trip Overview

If you are looking for a quick transit between Diamond Bar and Fontana, this 26.5-mile trip is an efficient way to get across the Pacific Coast region. With a driving time of roughly 32 minutes, it is perfectly suited for a single-day trip that requires no overnight stay. You will primarily navigate via the San Bernardino Freeway, I-10 Metro ExpressLanes, and the Orange Freeway. Budgeting about $6 for fuel is sufficient for the journey, making it a very economical commute. Since the route is entirely contained within California, you can expect a straightforward experience without the complexities of crossing state lines. It is an ideal choice if you prioritize speed and directness over a leisurely scenic tour.

Main Roads

Road Distance Duration
San Bernardino Freeway 12.5 mi 14m
I-10 Metro ExpressLanes 9 mi 9m
Orange Freeway 1.8 mi 2m
Sierra Avenue 1.7 mi 2m
North Diamond Bar Boulevard 0.1 mi <1m
Merrill Avenue <0.1 mi <1m
Longest stretch: San Bernardino Freeway — 12.5 mi, about 14m

Turn-by-Turn Driving Directions

Step-by-step road directions between Diamond Bar, CA and Fontana, CA.

1

Start on this road

33 ft · 4 sec · this road
2

Turn left

84 ft · 8 sec
3

Turn right onto North Diamond Bar Boulevard

0.1 mi · 19 sec · North Diamond Bar Boulevard
4

Take the ramp

0.2 mi · 30 sec
Toward CA 57 North Use the left lane.
5

Continue on CA 57

1.8 mi · 2 min · Orange Freeway
Use the straight / slight right lanes.
6

Take the exit

0.2 mi · 26 sec
Toward I 10 West, I 10 East: Los Angeles, San Bernardino, Ontario Airport Use the slight right lane.
7

Keep slight right at fork

0.5 mi · 1 min
Toward I 10 East: San Bernardino Freeway, San Bernardino Use the slight left / slight right lanes.
8

Merge onto I 10

2.1 mi · 2 min · San Bernardino Freeway
Use the straight / slight right lanes.
9

Keep slight right at fork onto I 10

4.0 mi · 4 min · San Bernardino Freeway
Use the straight / slight right lanes.
10

Keep slight left at fork onto I 10 EXPR

9.0 mi · 9 min · I-10 Metro ExpressLanes
Use the slight left lane.
11

Merge onto I 10

6.5 mi · 7 min · San Bernardino Freeway
Use the slight right lane.
12

Take the exit

0.2 mi · 29 sec
Exit 64 Toward Sierra Avenue Use the straight / slight right lanes.
13

Keep slight left at fork

448 ft · 12 sec
Toward Sierra Avenue North Use the left lane.
14

Turn slight left onto Sierra Avenue

1.7 mi · 2 min · Sierra Avenue
Use the left lane.
15

Turn right onto Merrill Avenue

205 ft · 4 sec · Merrill Avenue
16

Arrive at destination

Merrill Avenue

Heads-up: tricky spots

5 of 13

5 decision points cluster between mile 0.1 and 24.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.

7
0.1 mi into trip | ~0m in

Take the ramp toward CA 57 North

Lane positioning matters here

Use the left lane. Toward CA 57 North
7
2.2 mi into trip | ~3m in

Take the exit toward I 10 West, I 10 East: Los Angeles, San Bernardino, Ontario Airport

Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one

Use the slight right lane. Toward I 10 West, I 10 East: Los Angeles, San B...
8
2.4 mi into trip | ~3m in

Keep slight right at fork toward I 10 East: San Bernardino Freeway, San Bernardino

Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one

Use the slight left / slight right lanes. Toward I 10 East: San Bernardino Freeway, San B...
7
24.4 mi into trip | ~28m in

Take the exit toward Sierra Avenue

Exit ramp - move to the correct lane early. Lane positioning matters here

Use the straight / slight right lanes. Exit 64 Toward Sierra Avenue
8
24.6 mi into trip | ~29m in

Keep slight left at fork toward Sierra Avenue North

Highway fork - watch signs carefully. Lane positioning matters here

Use the left lane. Toward Sierra Avenue North

Fuel & Cost

Regular Gas

$6.09 one way

$12.18 round trip

$5.84/gal 25.4 MPG avg 9 kg CO2
Fuel Type $/gal One Way Round Trip
midgrade $6.02 $6.28 $12.55
premium $6.18 $6.44 $12.89
diesel $5.61 $5.85 $11.70

No toll roads detected on this route.

Drive Cost (one way)

Fuel

$6

Estimated CO2 emission: 9.3 kg one way. Prices: EIA weekly data, 2026-04-13.

Driving Electric?

About $3 in charging · 0 stops · 67% less CO2

Vehicle Type kWh Stops DC Fast Home Charge
Average EV 7.9 0 $2.78 $1.27
Efficient EV 6.6 0 $2.32 $1.06
EV Truck/SUV 10.6 0 $3.71 $1.70

Gas CO2

9 kg

EV CO2

3 kg (67% less)

This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.

DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.

Travel Intel

Current conditions at both ends of the drive.

Forecast as of Apr 13, 2026

Origin

Diamond Bar, CA

Morning in Diamond Bar on Sunday

Local time

8:54 AM

PDT

Current temp

47°F

Chance Light Rain then Partly Cloudy

WSW 0 to 10 mph 27% chance Live forecast

Wind Advisory

Wind Advisory issued April 12 at 6:54PM PDT until April 12 at 11:00PM PDT by NWS Las Vegas NV

Wind Advisory

Wind Advisory issued April 12 at 6:54PM PDT until April 12 at 11:00PM PDT by NWS Las Vegas NV

Destination

Fontana, CA

Morning in Fontana on Sunday

Local time

8:54 AM

PDT

Current temp

47°F

Mostly Cloudy then Chance Rain Showers

SW 5 to 15 mph 26% chance Live forecast

Wind Advisory

Wind Advisory issued April 12 at 6:54PM PDT until April 12 at 11:00PM PDT by NWS Las Vegas NV

Wind Advisory

Wind Advisory issued April 12 at 6:54PM PDT until April 12 at 11:00PM PDT by NWS Las Vegas NV

Time zone

Same local time

Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.

Temperature spread

Very similar conditions

Both ends of the route are sitting at about the same temperature right now.

Road read

32m on the road

The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.

Weather data from the National Weather Service. Conditions may change; check closer to your travel date.

What kind of drive is this?

Expect a focused, highway-heavy experience, as 88% of this route consists of high-speed transit. You will spend the majority of your time on major arterials, including a significant 12.5-mile stretch on the San Bernardino Freeway. The drive feels like a standard interstate run, prioritizing utility and flow rather than winding backroads or technical maneuvers. Because the route is so heavily concentrated on highways, you should prepare for steady, fast-paced driving conditions throughout the entire 32-minute duration. It is a no-nonsense path designed to move you from point A to point B with minimal interruption.

88% highway — fuel and pacing are the main things to plan.
16 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 12.5 mi on San Bernardino Freeway.

How Hard Is This Drive?

10/10

This is a straightforward highway drive that stays mostly on San Bernardino Freeway and I-10 Metro ExpressLanes. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.1 miles in.

Driving Effort 10/10

Focused - lots of decisions in a short distance, but it is over quickly

Balances navigation complexity with total wheel time.

This is a short but busy drive. With 13 decision points packed into just 26.5 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 32m.

Where does it get tricky?

The main spots that need attention: at 0.1 miles: Lane positioning matters here; at 2.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 2.4 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.

Elevation Profile

Mostly flat terrain

1,235 ft 736 ft

Total Climb

627 ft

Total Descent

128 ft

Highest Point

1,235 ft

~26.5 mi in

Elevation Range

499 ft

Towns Mentioned on Route Signs

Based on OSRM destination-sign hints, not a full list of every settlement the road passes.

Between Diamond Bar, CA and Fontana, CA, road signs point toward San Bernardino, Ontario Airport and Sierra Avenue North.

San Bernardino

2.2 mi in | ~3m

Ontario Airport

2.2 mi in | ~3m

Sierra Avenue North

24.6 mi in | ~29m

About the Cities

Starting in Diamond Bar, CA

Full guide →

Diamond Bar is a city in the San Gabriel Valley of Los Angeles in Southern California.

Arriving in Fontana, CA

Full guide →

Fontana is a city in San Bernardino County in Southern California.

City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).

Who Is This Route For?

Weekend Trip

Doable as a same-day drive at 32m. Total distance: 26.5 miles.

Family Friendly

Moderate complexity with 0 natural rest stops along the way.

Solo Traveler

32m drive, comfortable solo distance.

EV Driver

0 DC fast chargers along the route. Coverage: unknown.

First-Time Driver

Mostly highway driving (88%). Some complex stretches to watch for.

Frequently Asked Questions

The longest stretch is about 12.5 miles on San Bernardino Freeway. The full list of main roads is in the Roads section above.

It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Fontana, CA before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.

Yes. At under 2 hours behind the wheel, this works well for families — plan one quick stop if you have younger kids.

The main spots that need attention: at 0.1 miles: Lane positioning matters here; at 2.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 2.4 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.

Yes. A round trip is manageable in a single day if you plan a break at Fontana, CA before heading back.

How this page is built

Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and USGS 3DEP for elevation. See our methodology for refresh cadence and limitations.

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