How far is Thermal, CA from San Diego, CA?
The driving distance from Thermal, CA to San Diego, CA is about 142.7 miles (229.6 km), with a travel time of about 02h 55m by car.
- The straight-line flight distance is about 87.2 miles (140.3 km).
- For a round trip, plan for roughly 05h 51m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM PDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 02h 55m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Census-designated place in Riverside County, California, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between Thermal and San Diego.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thermal and San Diego.
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1
Start on Grapefruit Boulevard
1609 ft · 36 sec · Grapefruit Boulevard
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2
Turn left onto Palm Street
653 ft · 36 sec · Palm Street
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3
Turn left onto Airport Boulevard
1.1 km · 1 min · Airport Boulevard
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4
Take the ramp right toward CA 86 N: CA 86 N
896 ft · 25 sec
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5
Merge slight left
6.6 mi · 8 min
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6
Merge slight right onto Sonny Bono Memorial Freeway
32.6 mi · 35 min · Sonny Bono Memorial Freeway
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7
Continue on Pearl Harbor Memorial Highway
17 mi · 18 min · Pearl Harbor Memorial Highway
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8
Take the exit slight right toward CA 79: Beaumont Avenue
1293 ft · 40 sec
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9
Turn left onto Beaumont Avenue
2149 ft · 42 sec · Beaumont Avenue
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10
Continue on Lamb Canyon Road
5.6 mi · 7 min · Lamb Canyon Road
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11
Continue on Sanderson Avenue
9.6 mi · 15 min · Sanderson Avenue
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12
Turn right onto Domenigoni Parkway
4.9 mi · 6 min · Domenigoni Parkway
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13
Turn left onto Winchester Road
13.4 mi · 19 min · Winchester Road
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14
Take the ramp slight right toward I 15 South, CA 79 South: San Diego
1573 ft · 33 sec
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15
Merge slight left onto Escondido Freeway
4.5 mi · 5 min · Escondido Freeway
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16
Continue on Avocado Highway
21.9 mi · 24 min · Avocado Highway
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17
Continue on Escondido Freeway
3.4 mi · 4 min · Escondido Freeway
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18
Keep slight right to continue on Escondido Freeway
8.7 mi · 10 min · Escondido Freeway
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19
Continue on Tony Gwynn Memorial Freeway
4.5 mi · 5 min · Tony Gwynn Memorial Freeway
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20
Continue on Escondido Freeway
3.1 mi · 4 min · Escondido Freeway
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21
Continue on Semper Fi Highway
2.2 mi · 3 min · Semper Fi Highway
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22
Take the exit slight right toward CA 163 South
1.2 km · 52 sec
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23
Continue on Cabrillo Freeway
8.2 mi · 9 min · Cabrillo Freeway
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24
Continue on Cabrillo Parkway
1.5 mi · 2 min · Cabrillo Parkway
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25
Continue on Cabrillo Parkway
1.3 km · 1 min · Cabrillo Parkway
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26
Continue on 10th Avenue
1507 ft · 42 sec · 10th Avenue
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27
Turn right onto Broadway
2811 ft · 1 min · Broadway
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28
Turn left onto Front Street
8 m · 1 sec · Front Street
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29
Arrive at your destination
0 m · 1 sec · Front Street
Car Route Details
A richer read on the saved driving route between Thermal and San Diego.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Sonny Bono Memorial Freeway
Merge slight right onto Sonny Bono Memorial Freeway
32.6 mi · 00h 35m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Sunny leaving Thermal and Sunny near San Diego.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thermal to San Diego?
The road trip is about 142.7 miles (229.6 km) and usually takes 02h 55m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Homeland is a useful midpoint, sitting about 76.2 miles from Thermal and 66.4 miles from San Diego.
How much longer is the road route than the straight-line distance?
The direct path is about 87.2 miles (140.3 km), while the road route adds roughly 55.5 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 8:00 AM to 10:00 AM PDT. If you want a more comfortable same-day return, try to leave by 12:38 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $31.56 one way or $63.11 round trip. Estimated CO2 is about 44.8 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Thermal and Sunny near San Diego.
Stop Ideas Near Homeland
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Best Western Plus Diamond Valley Inn
Rotary Park
H&R Block
Superior Court of California, County of Riverside - Temecula Courthouse
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Homeland.
Sun City, California
Hemet (West Florida Ave), California
Hemet (Devonshire Ave), California
Perris, California
Flight Path Map
This map shows the direct air route between Thermal and San Diego. Straight-line distance: 87.15 mi (140.26 km).
#1 Thermal
Situated within Riverside County's Coachella Valley near the Salton Sea, this desert community lies at an elevation of approximately 118 feet below sea level.
| Population | 0 |
| Coordinates | 33.6403000, -116.1394500 |
| Altitude | -36 |
| Country | United States |
#2 San Diego
The eighth most populous city in the United States and the center of the San Diego metropolitan area.
| Population | 1,422,420 |
| Coordinates | 32.7157100, -117.1647200 |
| Altitude | 20 |
| Country | United States |
End: Front Street (-117.164717, 32.71571)
Estimated Travel Time
Distance: 230 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 45m |
| 40 mph (64.37 km/h) | 03h 34m |
| 50 mph (80.47 km/h) | 02h 51m |
| 60 mph (96.56 km/h) | 02h 22m |
| 70 mph (112.65 km/h) | 02h 02m |
| 80 mph (129 km/h) | 01h 46m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $6.26 | $31.56 | $63.11 |
| Mid-grade | $6.50 | $32.75 | $65.51 |
| Premium | $6.69 | $33.71 | $67.43 |
| Diesel | $8.41 | $42.40 | $84.80 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in California · Oct 15, 2026