How far is Alamosa, CO from Longmont, CO?
The driving distance from Alamosa, CO to Longmont, CO is about 244.4 miles (393.3 km), with a travel time of about 04h 22m by car.
- The straight-line flight distance is about 190.9 miles (307.3 km).
- For a round trip, plan for roughly 08h 45m 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 22m.
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.
Census-designated place in Pueblo County, Colorado
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Snow Showers
Driving Route Map
The map below follows the saved road route between Alamosa and Longmont.
Turn-by-Turn Driving Directions
Step-by-step road directions between Alamosa and Longmont.
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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
4.3 mi · 6 min · North Valley Highway
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14
Keep slight right to continue on North Valley Highway
5.3 mi · 6 min · North Valley Highway
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15
Continue on Dwight D. Eisenhower Highway
12.2 mi · 12 min · Dwight D. Eisenhower Highway
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16
Take the exit slight right toward CO 119 West: Firestone Boulevard
996 ft · 19 sec
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17
Keep slight left to continue on CO 119 West: Longmont
88 m · 8 sec
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18
Turn left onto Highway 119
3.1 mi · 4 min · Highway 119
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19
Continue on East Ken Pratt Boulevard
1.6 mi · 2 min · East Ken Pratt Boulevard
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20
Take the exit slight right
69 m · 7 sec
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21
Turn right onto East 3rd Avenue
1.9 mi · 4 min · East 3rd Avenue
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22
Turn right onto Kimbark Street
1084 ft · 55 sec · Kimbark Street
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23
Turn left
57 m · 16 sec
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24
Turn right
33 m · 8 sec
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25
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Alamosa and Longmont.
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 Slight Chance Snow Showers near Longmont.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Alamosa to Longmont?
The road trip is about 244.4 miles (393.3 km) and usually takes 04h 22m 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 West is a useful midpoint, sitting about 134.8 miles from Alamosa and 109.6 miles from Longmont.
How much longer is the road route than the straight-line distance?
The direct path is about 190.9 miles (307.3 km), while the road route adds roughly 53.5 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 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 8:14 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $31.91 one way or $63.83 round trip. Estimated CO2 is about 76.7 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Alamosa and Slight Chance Snow Showers near Longmont.
Stop Ideas Near Pueblo West
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 West.
Pueblo, Colorado
Colorado Springs, Colorado
La Junta
Salida, CO
Flight Path Map
This map shows the direct air route between Alamosa and Longmont. Straight-line distance: 190.93 mi (307.27 km).
#1 Alamosa
City in Colorado, USA
| Population | 9,367 |
| Coordinates | 37.4694500, -105.8700200 |
| Altitude | 2299 |
| Country | United States |
#2 Longmont
The most populous city in Boulder County, Colorado.
| Population | 98,445 |
| Coordinates | 40.1672100, -105.1019300 |
| Altitude | 1519 |
| Country | United States |
End: (-105.101861, 40.16721)
Estimated Travel Time
Distance: 393 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 08h 08m |
| 40 mph (64.37 km/h) | 06h 06m |
| 50 mph (80.47 km/h) | 04h 53m |
| 60 mph (96.56 km/h) | 04h 04m |
| 70 mph (112.65 km/h) | 03h 29m |
| 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 | $31.91 | $63.83 |
| Mid-grade | $4.08 | $35.24 | $70.49 |
| Premium | $4.39 | $37.89 | $75.79 |
| Diesel | $4.74 | $40.88 | $81.76 |
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 18, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.