How far is Thornton, CO from Sterling, CO?
The driving distance from Thornton, CO to Sterling, CO is about 121 miles (194.7 km), with a travel time of about 02h 09m by car.
- The straight-line flight distance is about 106.8 miles (171.8 km).
- For a round trip, plan for roughly 04h 18m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM MDT.
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 09m.
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.
Town in Colorado, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Thornton and Sterling.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thornton and Sterling.
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1
Start on the route
23 m · 12 sec
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2
Turn left onto Dorothy Boulevard
1165 ft · 55 sec · Dorothy Boulevard
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3
At the end of the road, turn right onto Thornton Parkway
1.7 mi · 3 min · Thornton Parkway
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4
Turn right onto Colorado Boulevard
1.6 km · 2 min · Colorado Boulevard
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5
Turn left onto East 88th Avenue
1.6 mi · 3 min · East 88th Avenue
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6
Take the ramp left toward I 76 East: Brush
1052 ft · 26 sec
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7
Merge slight left onto Heartland Expressway
1.8 mi · 2 min · Heartland Expressway
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8
Keep slight right to continue on Heartland Expressway
112 mi · 1 hr 52 min · Heartland Expressway
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9
Take the exit slight right toward US 6: Sterling, Holyoke
2004 ft · 49 sec
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10
Keep slight left to continue on US 6 West: Sterling
56 m · 6 sec
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11
Turn left onto US Highway 6
3251 ft · 1 min · US Highway 6
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12
Continue on East Chestnut Street
1.4 mi · 3 min · East Chestnut Street
-
13
Turn left onto North 3rd Street
84 m · 10 sec · North 3rd Street
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14
Turn right
73 m · 18 sec
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15
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Thornton and Sterling.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Heartland Expressway
Keep slight right to continue on Heartland Expressway
112 mi · 01h 52m
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 Thornton and Sunny near Sterling.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thornton to Sterling?
The road trip is about 121 miles (194.7 km) and usually takes 02h 09m 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?
Wiggins is a useful midpoint, sitting about 60.4 miles from Thornton and 60.6 miles from Sterling.
How much longer is the road route than the straight-line distance?
The direct path is about 106.8 miles (171.8 km), while the road route adds roughly 14.2 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 MDT. If you want a more comfortable same-day return, try to leave by 2:12 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $15.79 one way or $31.58 round trip. Estimated CO2 is about 37.9 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Thornton and Sunny near Sterling.
Stop Ideas Near Wiggins
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Wiggins.
Fort Morgan
Longmont, Colorado
Fort Collins, Colorado
Denver (Bus Station), Colorado
Flight Path Map
This map shows the direct air route between Thornton and Sterling. Straight-line distance: 106.75 mi (171.79 km).
#1 Thornton
The seventh most populous city in Colorado.
| Population | 148,113 |
| Coordinates | 39.8680400, -104.9719200 |
| Altitude | 1631 |
| Country | United States |
#2 Sterling
City in Colorado
| Population | 14,078 |
| Coordinates | 40.6255400, -103.2077100 |
| Altitude | 1200 |
| Country | United States |
End: Sterling (-103.20771, 40.62554)
Estimated Travel Time
Distance: 195 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 01m |
| 40 mph (64.37 km/h) | 03h 01m |
| 50 mph (80.47 km/h) | 02h 25m |
| 60 mph (96.56 km/h) | 02h 00m |
| 70 mph (112.65 km/h) | 01h 43m |
| 80 mph (129 km/h) | 01h 30m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $15.79 | $31.58 |
| Mid-grade | $4.08 | $17.44 | $34.88 |
| Premium | $4.39 | $18.75 | $37.50 |
| Diesel | $4.74 | $20.23 | $40.45 |
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 Colorado · Apr 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.