How far is Alamosa, CO from Thornton, CO?
The driving distance from Alamosa, CO to Thornton, CO is about 225.6 miles (363 km), with a travel time of about 03h 53m by car.
- The straight-line flight distance is about 172.7 miles (277.9 km).
- For a round trip, plan for roughly 07h 46m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 03h 53m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
The most populous city in Pueblo County, Colorado.
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 Alamosa and Thornton.
Turn-by-Turn Driving Directions
Step-by-step road directions between Alamosa and Thornton.
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1
Start on Ross Avenue
20 m · 7 sec · Ross Avenue
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2
Turn left onto Fourth Street
2320 ft · 1 min · Fourth Street
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3
At the end of the road, turn left onto Denver Avenue
159 m · 18 sec · Denver Avenue
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4
Continue on Broadway Avenue
1420 ft · 41 sec · Broadway Avenue
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5
Continue on Santa Fe Avenue
71.4 mi · 1 hr 28 min · Santa Fe Avenue
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6
Turn left onto Main Street
1938 ft · 44 sec · Main Street
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7
Continue on Main Street
64 m · 4 sec · Main Street
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8
Continue on Walsen Avenue
1.1 km · 1 min · Walsen Avenue
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9
Continue on US Highway 85/87
1.6 mi · 2 min · US Highway 85/87
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10
Take the ramp straight toward I 25 North: Pueblo
86.9 mi · 1 hr 31 min
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11
Continue on Monument Valley Freeway
8.5 mi · 10 min · Monument Valley Freeway
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12
Continue on Ronald Reagan Highway
70.1 mi · 1 hr 18 min · Ronald Reagan Highway
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13
Keep slight right to continue on North Valley Highway
1.3 mi · 2 min · North Valley Highway
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14
Take the exit slight right toward Thornton Parkway
2280 ft · 43 sec
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15
Turn right onto Thornton Parkway
1.4 km · 2 min · Thornton Parkway
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16
Turn right onto Dorothy Boulevard
1077 ft · 51 sec · Dorothy Boulevard
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17
Turn right
36 m · 9 sec
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18
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Alamosa and Thornton.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 25 North
Take the ramp straight toward I 25 North: Pueblo
86.9 mi · 01h 31m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Sunny leaving Alamosa and Sunny near Thornton.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Alamosa to Thornton?
The road trip is about 225.6 miles (363 km) and usually takes 03h 53m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Pueblo is a useful midpoint, sitting about 121.7 miles from Alamosa and 103.8 miles from Thornton.
How much longer is the road route than the straight-line distance?
The direct path is about 172.7 miles (277.9 km), while the road route adds roughly 52.9 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 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 9:14 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $29.44 one way or $58.87 round trip. Estimated CO2 is about 70.7 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Alamosa and Sunny near Thornton.
Stop Ideas Near Pueblo
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 Pueblo.
Pueblo, Colorado
Colorado Springs, Colorado
La Junta
Flight Path Map
This map shows the direct air route between Alamosa and Thornton. Straight-line distance: 172.66 mi (277.87 km).
#1 Alamosa
City in Colorado, USA
| Population | 9,367 |
| Coordinates | 37.4694500, -105.8700200 |
| Altitude | 2299 |
| Country | United States |
#2 Thornton
The seventh most populous city in Colorado.
| Population | 148,113 |
| Coordinates | 39.8680400, -104.9719200 |
| Altitude | 1631 |
| Country | United States |
End: (-104.971859, 39.868064)
Estimated Travel Time
Distance: 363 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 30m |
| 40 mph (64.37 km/h) | 05h 38m |
| 50 mph (80.47 km/h) | 04h 30m |
| 60 mph (96.56 km/h) | 03h 45m |
| 70 mph (112.65 km/h) | 03h 13m |
| 80 mph (129 km/h) | 02h 48m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $29.44 | $58.87 |
| Mid-grade | $4.08 | $32.51 | $65.02 |
| Premium | $4.39 | $34.95 | $69.90 |
| Diesel | $4.74 | $37.71 | $75.41 |
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.