How far is Castlewood, CO from Westminster, CO?
The driving distance from Castlewood, CO to Westminster, CO is about 25.4 miles (40.8 km), with a travel time of about 00h 36m by car.
- The straight-line flight distance is about 18.8 miles (30.3 km).
- For a round trip, plan for roughly 01h 12m 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 36m.
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.
Mostly Sunny then Slight Chance Showers And Thunderstorms
Mostly Sunny then Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Castlewood and Westminster.
Turn-by-Turn Driving Directions
Step-by-step road directions between Castlewood and Westminster.
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1
Start on East Fremont Drive
704 ft · 33 sec · East Fremont Drive
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2
Turn right onto East Hinsdale Avenue
151 m · 24 sec · East Hinsdale Avenue
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3
At the end of the road, turn right onto South Quebec Street
1.3 km · 2 min · South Quebec Street
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4
Turn right onto East Arapahoe Road
1.1 mi · 2 min · East Arapahoe Road
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5
Take the ramp straight toward I 25 North: Denver
859 ft · 23 sec
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6
Merge slight left onto South Valley Highway
19.5 mi · 25 min · South Valley Highway
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7
Take the exit slight left toward US 36 West: Westminster, Boulder
2930 ft · 52 sec
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8
Merge slight right onto Denver–Boulder Turnpike
1.8 mi · 2 min · Denver–Boulder Turnpike
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9
Take the exit slight right toward US 287: Federal Boulevard
1157 ft · 23 sec
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10
Keep slight right to continue on US 287 North: Federal Boulevard
1577 ft · 34 sec
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11
Turn straight onto Federal Boulevard
1417 ft · 40 sec · Federal Boulevard
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12
Turn left onto West 80th Avenue
2676 ft · 1 min · West 80th Avenue
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13
Turn left onto Lowell Boulevard
1996 ft · 44 sec · Lowell Boulevard
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14
Turn right onto West 77th Avenue
873 ft · 42 sec · West 77th Avenue
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15
Turn right onto Newton Street
35 m · 5 sec · Newton Street
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16
Arrive at your destination
0 m · 1 sec · Newton Street
Car Route Details
A richer read on the saved driving route between Castlewood and Westminster.
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.
South Valley Highway
Merge slight left onto South Valley Highway
19.5 mi · 00h 25m
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.
Mostly Sunny then Slight Chance Showers And Thunderstorms leaving Castlewood and Mostly Sunny then Slight Chance Showers And Thunderstorms near Westminster.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Castlewood to Westminster?
The road trip is about 25.4 miles (40.8 km) and usually takes 00h 36m 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 13 miles from Castlewood and 12.4 miles from Westminster.
How much longer is the road route than the straight-line distance?
The direct path is about 18.8 miles (30.3 km), while the road route adds roughly 6.6 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 7:18 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.33 one way or $6.66 round trip. Estimated CO2 is about 8 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Slight Chance Showers And Thunderstorms around Castlewood and Mostly Sunny then Slight Chance Showers And Thunderstorms near Westminster.
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 Castlewood and Westminster. Straight-line distance: 18.85 mi (30.34 km).
#1 Castlewood
City in Hamlin County, South Dakota, United States
| Population | 25,271 |
| Coordinates | 39.5847100, -104.9010900 |
| Altitude | 1746 |
| Country | United States |
#2 Westminster
The most populous city in Adams County, Colorado.
| Population | 115,046 |
| Coordinates | 39.8366500, -105.0372000 |
| Altitude | 1641 |
| Country | United States |
End: Newton Street (-105.037386, 39.836648)
Estimated Travel Time
Distance: 41 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 50m |
| 40 mph (64.37 km/h) | 00h 38m |
| 50 mph (80.47 km/h) | 00h 30m |
| 60 mph (96.56 km/h) | 00h 25m |
| 70 mph (112.65 km/h) | 00h 21m |
| 80 mph (129 km/h) | 00h 18m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.70 | $3.33 | $6.66 |
| Mid-grade | $4.08 | $3.68 | $7.35 |
| Premium | $4.39 | $3.95 | $7.90 |
| Diesel | $4.74 | $4.26 | $8.53 |
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 · May 25, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.