How far is Thornton, CO from Southglenn, CO?
The driving distance from Thornton, CO to Southglenn, CO is about 23.5 miles (37.9 km), with a travel time of about 00h 40m by car.
- The straight-line flight distance is about 19.4 miles (31.3 km).
- For a round trip, plan for roughly 01h 20m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM MDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 00h 40m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
The twentieth most populous city in the United States and the center of the Denver metropolitan area.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Showers And Thunderstorms
Mostly Sunny then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Thornton and Southglenn.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thornton and Southglenn.
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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 · 59 sec · Dorothy Boulevard
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3
At the end of the road, turn left onto Thornton Parkway
1.6 km · 2 min · Thornton Parkway
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4
Turn left onto I 25 South: Colorado Springs
1973 ft · 40 sec
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5
Merge slight left onto North Valley Highway
1.2 mi · 2 min · North Valley Highway
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6
Keep slight right to continue on North Valley Highway
12.3 mi · 17 min · North Valley Highway
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7
Take the exit slight right toward University Boulevard
1.1 km · 1 min
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8
Keep slight right to continue on University Boulevard
1013 ft · 25 sec
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9
Keep slight right to continue on University Boulevard South
146 m · 12 sec
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10
Turn straight onto South University Boulevard
6.5 mi · 12 min · South University Boulevard
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11
Turn left onto East Easter Avenue
1.1 km · 2 min · East Easter Avenue
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12
Turn right onto South Madison Court
47 m · 8 sec · South Madison Court
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13
Turn right onto South Saint Paul Street
764 ft · 36 sec · South Saint Paul Street
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14
Turn right onto East Fremont Drive
583 ft · 28 sec · East Fremont Drive
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15
Turn right onto South Fillmore Circle
97 m · 17 sec · South Fillmore Circle
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16
Continue on South Fillmore Circle
36 m · 5 sec · South Fillmore Circle
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17
Arrive at your destination
0 m · 1 sec · South Fillmore Circle
Car Route Details
A richer read on the saved driving route between Thornton and Southglenn.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
North Valley Highway
Keep slight right to continue on North Valley Highway
12.3 mi · 00h 17m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Chance Showers And Thunderstorms leaving Thornton and Mostly Sunny then Chance Showers And Thunderstorms near Southglenn.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thornton to Southglenn?
The road trip is about 23.5 miles (37.9 km) and usually takes 00h 40m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Denver is a useful midpoint, sitting about 11.8 miles from Thornton and 11.7 miles from Southglenn.
How much longer is the road route than the straight-line distance?
The direct path is about 19.4 miles (31.3 km), while the road route adds roughly 4.1 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 7:00 AM to 7:00 PM MDT. If you want a more comfortable same-day return, try to leave by 7:10 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.07 one way or $6.14 round trip. Estimated CO2 is about 7.4 kg one way.
What should you check before leaving?
Before you leave, expect Chance Showers And Thunderstorms around Thornton and Mostly Sunny then Chance Showers And Thunderstorms near Southglenn.
Stop Ideas Near Denver
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Fairplay Park
Denver City Council
Town Hall Arts Center
Municipal Court Park
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Denver.
Denver (Bus Station), Colorado
Union Station
Boulder, Colorado
Pine Junction, CO
Flight Path Map
This map shows the direct air route between Thornton and Southglenn. Straight-line distance: 19.43 mi (31.27 km).
#1 Thornton
The seventh most populous city in Colorado.
| Population | 148,113 |
| Coordinates | 39.8680400, -104.9719200 |
| Altitude | 1631 |
| Country | United States |
#2 Southglenn
Neighborhood in Centennial, Colorado, United States
| Population | 42,268 |
| Coordinates | 39.5872100, -104.9527600 |
| Altitude | 1705 |
| Country | United States |
End: Southglenn (-104.95276, 39.58721)
Estimated Travel Time
Distance: 38 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 47m |
| 40 mph (64.37 km/h) | 00h 35m |
| 50 mph (80.47 km/h) | 00h 28m |
| 60 mph (96.56 km/h) | 00h 23m |
| 70 mph (112.65 km/h) | 00h 20m |
| 80 mph (129 km/h) | 00h 17m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $3.07 | $6.14 |
| Mid-grade | $4.08 | $3.39 | $6.78 |
| Premium | $4.39 | $3.64 | $7.29 |
| Diesel | $4.74 | $3.93 | $7.86 |
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 · Jun 03, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.