How far is Thornton, CO from Lamar, CO?
The driving distance from Thornton, CO to Lamar, CO is about 209.5 miles (337.1 km), with a travel time of about 04h 01m by car.
- The straight-line flight distance is about 176.3 miles (283.7 km).
- For a round trip, plan for roughly 08h 02m 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 01m.
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.
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 Lamar.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thornton and Lamar.
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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
1.3 km · 1 min · North Valley Highway
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7
Take the exit slight left toward I 270 East: Aurora, Limon
3003 ft · 1 min
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8
Merge slight right onto Dwight D. Eisenhower Highway
6.7 mi · 9 min · Dwight D. Eisenhower Highway
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9
Merge slight left onto Tuskegee Airmen Memorial Highway
3.8 mi · 5 min · Tuskegee Airmen Memorial Highway
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10
Keep slight left to continue on Tuskegee Airmen Memorial Highway
2.4 mi · 3 min · Tuskegee Airmen Memorial Highway
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11
Continue on Dwight D. Eisenhower Highway
76.6 mi · 1 hr 17 min · Dwight D. Eisenhower Highway
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12
Take the exit slight right toward US 40, US 287: Hugo, Kit Carson
1744 ft · 45 sec
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13
Turn right
62.3 mi · 1 hr 14 min
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14
Continue straight
17.5 mi · 21 min
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15
Continue on West 15th Street
29.8 mi · 35 min · West 15th Street
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16
Continue straight
5.9 mi · 9 min
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17
Turn right onto West Elm Street
133 m · 19 sec · West Elm Street
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18
Arrive at your destination
0 m · 1 sec · West Elm Street
Car Route Details
A richer read on the saved driving route between Thornton and Lamar.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Dwight D. Eisenhower Highway
Continue on Dwight D. Eisenhower Highway
76.6 mi · 01h 17m
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 Thornton and Sunny near Lamar.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thornton to Lamar?
The road trip is about 209.5 miles (337.1 km) and usually takes 04h 01m 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?
Hugo is a useful midpoint, sitting about 104.7 miles from Thornton and 104.8 miles from Lamar.
How much longer is the road route than the straight-line distance?
The direct path is about 176.3 miles (283.7 km), while the road route adds roughly 33.2 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 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 8:58 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $27.33 one way or $54.66 round trip. Estimated CO2 is about 65.7 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Thornton and Sunny near Lamar.
Flight Path Map
This map shows the direct air route between Thornton and Lamar. Straight-line distance: 176.3 mi (283.73 km).
#1 Thornton
The seventh most populous city in Colorado.
| Population | 148,113 |
| Coordinates | 39.8680400, -104.9719200 |
| Altitude | 1631 |
| Country | United States |
#2 Lamar
City in Colorado
| Population | 7,641 |
| Coordinates | 38.0872300, -102.6207500 |
| Altitude | 1103 |
| Country | United States |
End: Lamar (-102.62075, 38.08723)
Estimated Travel Time
Distance: 337 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 58m |
| 40 mph (64.37 km/h) | 05h 14m |
| 50 mph (80.47 km/h) | 04h 11m |
| 60 mph (96.56 km/h) | 03h 29m |
| 70 mph (112.65 km/h) | 02h 59m |
| 80 mph (129 km/h) | 02h 36m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $27.33 | $54.66 |
| Mid-grade | $4.08 | $30.18 | $60.36 |
| Premium | $4.39 | $32.45 | $64.90 |
| Diesel | $4.74 | $35.01 | $70.01 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.