How far is Thornton, CO from Alamosa, CO?
The driving distance from Thornton, CO to Alamosa, CO is about 243.5 miles (391.8 km), with a travel time of about 04h 37m by car.
- The straight-line flight distance is about 172.7 miles (277.9 km).
- For a round trip, plan for roughly 09h 15m 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 04h 37m.
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.
Showers And Thunderstorms Likely
Chance Snow Showers
Driving Route Map
The map below follows the saved road route between Thornton and Alamosa.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thornton and Alamosa.
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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
70.1 mi · 1 hr 18 min · North Valley Highway
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7
Continue on Monument Valley Freeway
8.8 mi · 10 min · Monument Valley Freeway
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8
Continue on Ronald Reagan Highway
915 ft · 12 sec · Ronald Reagan Highway
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9
Keep slight left to continue on Ronald Reagan Highway
22.7 mi · 23 min · Ronald Reagan Highway
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10
Continue on John F. Kennedy Memorial Highway
12.9 mi · 13 min · John F. Kennedy Memorial Highway
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11
Continue on North Freeway
2.6 mi · 3 min · North Freeway
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12
Take the exit slight right toward 29th Street
2351 ft · 33 sec
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13
Merge slight left onto North Freeway
1 mi · 1 min · North Freeway
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14
Take the exit slight right toward 13th Street
792 ft · 12 sec
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15
Continue straight
1189 ft · 18 sec
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16
Merge slight left onto North Freeway
6.1 mi · 8 min · North Freeway
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17
Continue on John F. Kennedy Memorial Highway
40.5 mi · 41 min · John F. Kennedy Memorial Highway
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18
Take the exit slight right toward South I 25 Business, US 160 West: Walsenburg, Alamosa
2.8 mi · 5 min
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19
Turn right onto West 7th Street
71.4 mi · 1 hr 27 min · West 7th Street
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20
Continue on Broadway Avenue
1420 ft · 39 sec · Broadway Avenue
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21
Continue on Denver Avenue
159 m · 18 sec · Denver Avenue
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22
Turn right onto Fourth Street
2320 ft · 1 min · Fourth Street
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23
Turn right onto Ross Avenue
20 m · 2 sec · Ross Avenue
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24
Arrive at your destination
0 m · 1 sec · Ross Avenue
Car Route Details
A richer read on the saved driving route between Thornton and Alamosa.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
West 7th Street
Turn right onto West 7th Street
71.4 mi · 01h 27m
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.
Showers And Thunderstorms Likely leaving Thornton and Chance Snow Showers near Alamosa.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thornton to Alamosa?
The road trip is about 243.5 miles (391.8 km) and usually takes 04h 37m 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 121.8 miles from Thornton and 121.7 miles from Alamosa.
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 70.8 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 7:44 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $31.77 one way or $63.53 round trip. Estimated CO2 is about 76.3 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms Likely around Thornton and Chance Snow Showers near Alamosa.
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 Thornton and Alamosa. Straight-line distance: 172.66 mi (277.87 km).
#1 Thornton
The seventh most populous city in Colorado.
| Population | 148,113 |
| Coordinates | 39.8680400, -104.9719200 |
| Altitude | 1631 |
| Country | United States |
#2 Alamosa
City in Colorado, USA
| Population | 9,367 |
| Coordinates | 37.4694500, -105.8700200 |
| Altitude | 2299 |
| Country | United States |
End: Alamosa (-105.87002, 37.46945)
Estimated Travel Time
Distance: 392 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 08h 06m |
| 40 mph (64.37 km/h) | 06h 05m |
| 50 mph (80.47 km/h) | 04h 52m |
| 60 mph (96.56 km/h) | 04h 03m |
| 70 mph (112.65 km/h) | 03h 28m |
| 80 mph (129 km/h) | 03h 02m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $31.77 | $63.53 |
| Mid-grade | $4.08 | $35.08 | $70.16 |
| Premium | $4.39 | $37.72 | $75.44 |
| Diesel | $4.74 | $40.69 | $81.38 |
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 15, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.