Traveling from Union City to Santa Ana covers approximately 394.5 miles, a journey that typically takes about 7 hours and 24 minutes behind the wheel. Because this route is almost entirely highway-focused, you can realistically complete the trip in a single day if you stay focused. Expect to budget around $91 for fuel, depending on your vehicle's efficiency. While both cities sit within the Pacific Coast region, the drive takes you through the heart of California’s interior corridor. It functions best as a direct transit route rather than a leisurely sightseeing tour, so plan your schedule accordingly to avoid peak traffic at either end.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
197.2 miles from Union City, CA
A natural place for your longest stop of the day
, about 3h 40m into the drive
.
Main Roads
Road
Distance
Duration
Westside Freeway
224.4 mi
4h
I 5 Truck
83.3 mi
1h 36m
Arthur H. Breed Junior Freeway
28.2 mi
32m
Santa Ana Freeway
26 mi
30m
William Elton Brown Freeway
17 mi
18m
Golden State Freeway
5.3 mi
6m
Hesperian Boulevard
2 mi
4m
West Jackson Street
1.5 mi
2m
Longest stretch:
Westside Freeway
— 224.4 mi, about 4h
Turn-by-Turn Driving Directions
Step-by-step road directions between Union City, CA and Santa Ana, CA.
1
Start on Cambridge Way
193 ft·10 sec·Cambridge Way
2
Turn left onto Union City Boulevard
0.9 mi·1 min·Union City Boulevard
Use the left lane.
3
Continue on Hesperian Boulevard
2.0 mi·4 min·Hesperian Boulevard
Use the left / straight / right lanes.
4
Take the ramp
0.5 mi·35 sec
Toward CA 92 East, I 880: HaywardUse the right lane.
5
Keep slight left at fork
0.2 mi·14 sec
Exit 26BToward I 880 North, CA 92 East: Oakland, Downtown Hayward
6
Keep slight right at fork
0.2 mi·23 sec
Toward CA 92 East: Downtown HaywardUse the slight left / slight right lanes.
7
Merge onto CA 92
0.2 mi·23 sec·Jackson Street
8
Continue on CA 92
1.5 mi·2 min·West Jackson Street
Use the straight / right lanes.
9
Continue on Foothill Boulevard
0.5 mi·1 min·Foothill Boulevard
Use the straight lane.
10
Turn right onto A Street
0.7 mi·1 min·A Street
Use the right lane.
11
Continue on Redwood Road
0.5 mi·59 sec·Redwood Road
12
Take the ramp
0.3 mi·37 sec
Toward I 580 East: StocktonUse the straight / right lanes.
13
Merge onto I 580
10 mi·11 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
14
Keep slight right at fork onto I 580
18 mi·20 min·Arthur H. Breed Junior Freeway
Use the straight / slight right lanes.
15
Keep slight right at fork onto I 580
11 mi·11 min·William Elton Brown Freeway
16
Keep slight left at fork onto I 580
5.9 mi·6 min·William Elton Brown Freeway
17
Merge onto I 5
224 mi·4 hr·Westside Freeway
Use the straight / slight right lanes.
18
Keep slight right at fork onto I 5 Truck
58 mi·1 hr 6 min·I 5 Truck
Use the straight / slight right lanes.
19
Keep slight left at fork onto I 5
4.1 mi·4 min·Golden State Freeway
Use the straight / slight right lanes.
20
Keep slight right at fork onto I 5 Truck
0.3 mi·17 sec·I 5 Truck
Exit 158Toward I 405 SouthUse the straight / slight right lanes.
21
Keep slight left at fork onto I 5 Truck
25 mi·29 min·I 5 Truck
Use the straight / slight right lanes.
22
Keep slight left at fork onto I 5
1.3 mi·1 min·Golden State Freeway
Toward CA 60 East, I 5 South: Pomona, Soto Street, Santa AnaUse the slight left / straight lanes.
23
Merge onto I 5
26 mi·30 min·Santa Ana Freeway
Use the straight / slight right lanes.
24
Keep slight right at fork onto I 5
0.2 mi·16 sec·Santa Ana Freeway
Use the straight / slight right lanes.
25
Take the exit
0.8 mi·57 sec
Toward Broadway, Main Street, Santa AnaUse the straight / slight right lanes.
26
Keep slight right at fork
0.3 mi·21 sec
Toward Main Street North, BroadwayUse the straight / slight right lanes.
27
Turn straight onto North Broadway
1.3 mi·2 min·North Broadway
Use the left lane.
28
Turn left onto West 5th Street
0.1 mi·16 sec·West 5th Street
Use the left lane.
29
Turn right onto North Main Street
0.2 mi·30 sec·North Main Street
Use the right lane.
30
Turn right onto West 1st Street
52 ft·1 sec·West 1st Street
Use the right lane.
31
Arrive at destination
West 1st Street
Trip Plan
To manage the 7-hour and 24-minute duration effectively, aim to break up your travel with the two recommended stops to avoid fatigue during the long 224.4-mile stretch on the Westside Freeway. Leaving early in the morning is your best bet to bypass potential congestion in the Bay Area or the Los Angeles basin. Keep a close eye on your fuel gauge during the long interstate sections, as service intervals can vary across these stretches. Since the trip is manageable in one day, use your two stops strategically to stretch your legs and reset before entering the busier traffic patterns near Santa Ana. Staying flexible with your departure time can make a significant difference in your overall stress level.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 197.2 miles from Union City, CA, or about 3h 40m into the drive.
The longest continuous stretch on this route runs about 224.4 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 87 miles or 1h 42m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 197.2 miles or 3h 40m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 6h 12m
Traffic, exits, and arrival timing usually matter more near Santa Ana, CA than in the middle of the route.
Before You Leave
+
Open the route before leaving Union City, CA so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
Day 1
Settle into the route from Union City, CA
This is one driving day of about 394.5 miles and 7h 24m.
Your first comfortable stop window is around 87 miles from Union City, CA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on Westside Freeway for about 224.4 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 25
5 decision points cluster between mile 3.4 and 392.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
3.4 mi into trip|~6m in
Keep slight left at fork toward I 880 North, CA 92 East: Oakland, Downtown Hayward
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Exit 26B
Toward I 880 North, CA 92 East: Oakland, Downto...
8
3.6 mi into trip|~7m in
Keep slight right at fork toward CA 92 East: Downtown Hayward
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left / slight right lanes.
Toward CA 92 East: Downtown Hayward
8
339.5 mi into trip|~6h 17m in|I 5 Truck
Keep slight right at fork onto I 5 Truck toward I 405 South
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Exit 158
Toward I 405 South
8
364.5 mi into trip|~6h 47m in|I 5 / Golden State Freeway
Keep slight left at fork onto I 5 / Golden State Freeway toward CA 60 East, I 5 South: Pomona, Soto Street, Santa Ana
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left / straight lanes.
Toward CA 60 East, I 5 South: Pomona, Soto Stre...
8
392.5 mi into trip|~7h 20m in
Keep slight right at fork toward Main Street North, Broadway
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward Main Street North, Broadway
Fuel & Cost
Regular Gas
$90.67 one way
$181.35 round trip
$5.84/gal25.4 MPG avg138 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$6.02
$93.44
$186.87
premium
$6.18
$95.94
$191.88
diesel
$5.61
$87.10
$174.20
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$91
Meals
$25–$50
Total
$116–$141
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 138 kg one way.
Prices: EIA weekly data, 2026-04-13.
Station data from NREL Alternative Fuel Stations database.
Driving Electric?
About $41 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
118.4
1
$41.42
$18.94
Efficient EV
98.6
1
$34.52
$15.78
EV Truck/SUV
157.8
1
$55.23
$25.25
Gas CO2
138 kg
EV CO2
46 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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
Union City, CA
Late night
in Union City on Tuesday
Local time
5:52 AM
PDT
Current temp
52°F
Unavailable
Live forecast
Destination
Santa Ana, CA
Late night
in Santa Ana on Tuesday
Local time
5:52 AM
PDT
Current temp
67°F
Showers And Thunderstorms Likely
SW 10 to 15 mph71% chanceLive forecast
Severe Thunderstorm Warning
Severe Thunderstorm Warning issued April 12 at 4:57PM PDT until April 12 at 5:15PM PDT by NWS Sacramento CA
Wind Advisory
Wind Advisory issued April 12 at 2:16PM PDT until April 12 at 11:00PM PDT by NWS Hanford CA
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
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
15 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
7h 24m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Santa Monica Mountains National Recreation Area
National Recreation Area
The Santa Monica Mountains offer easy access to surprisingly wild places. Experience the famous beaches of Malibu or explore more than 500 miles of trails. The park abounds with historical and cultura...
22 mi from route
~55 min detour
Free
near mile 340.1
Established in 1988, San Francisco Maritime National Historical Park celebrates America’s maritime heritage on the Pacific Coast. Our 50-acre park has grown around Aquatic Park Cove, a protected area...
On July 17, 1944, a massive explosion jolted the San Francisco East Bay area, shattering windows and lighting up the night sky. At Port Chicago Naval Magazine, 320 men were killed instantly when two s...
25 mi from route
~63 min detour
Free
near mile 13.6
Rosie the Riveter WWII Home Front National Historical Park
National Historical Park
Celebrate and honor the contributions and sacrifices of American civilians on the WWII home front. Discover how diverse communities lived, worked, and interacted. Many faces, many stories, many truths...
26 mi from route
~65 min detour
Free
near mile 13.6
Yes, we can! Widely recognized as the most important Latino leader in the United States during the twentieth century, Cesar Chavez led farm workers and supporters in the establishment of the country's...
28 mi from route
~69 min detour
Free
near mile 272.1
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This drive is defined by its efficiency, with 97% of the journey spent on major highways. You will spend a significant portion of your time on the Westside Freeway, which includes a long, uninterrupted stretch of 224.4 miles. Navigating the I-5 Truck route and the Arthur H. Breed Junior Freeway requires sustained attention as you transition between these primary arteries. Because the road consists almost exclusively of high-speed transit, the experience is more of a consistent interstate grind than a technical or winding scenic excursion. Prepare for a straightforward, high-mileage trek that prioritizes speed over variety.
97% highway — fuel and pacing are the main things to plan.
31 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 224.4 mi on Westside Freeway.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on Westside Freeway and I 5 Truck. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 3.4 miles in.
Driving Effort9/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 25 significant decision points across 394.5 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 3.4 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 3.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 339.5 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here.
Union City is a city of 70,000 people (in 2020) in the southern part of the East Bay portion of the San Francisco Bay Area region of California. It is bordered to the north by the city of Hayward and to the south by the city of Fremont. It is part of the Tri-Cities area, which consists of Union City, Fremont, and Newark.
Doable as a same-day drive at 7h 24m. Total distance: 394.5 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
7h 24m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 224.4 miles on Westside Freeway. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
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 Santa Ana, CA before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 2 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 3.4 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 3.6 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 339.5 miles (I 5 Truck): Highway fork - watch signs carefully. Lane positioning matters here.
Yes — Santa Monica Mountains National Recreation Area, San Francisco Maritime National Historical Park and Port Chicago Naval Magazine National Memorial (5 total within detour distance). See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 7.4 hours each way, a round trip means 14.8 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Santa Ana, CA before the return drive.
