How far is Green Park, MO from Castle Point, MO?
The driving distance from Green Park, MO to Castle Point, MO is about 24.1 miles (38.8 km), with a travel time of about 00h 34m by car.
- The straight-line flight distance is about 16.9 miles (27.2 km).
- For a round trip, plan for roughly 01h 08m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM CDT.
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 34m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
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 second most populous city in Missouri and the center of the St.
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 Green Park and Castle Point.
Turn-by-Turn Driving Directions
Step-by-step road directions between Green Park and Castle Point.
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1
Start on Arnett Drive
152 m · 24 sec · Arnett Drive
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2
Turn right onto Alix Drive
96 m · 19 sec · Alix Drive
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3
Turn left onto Antrill Drive
541 ft · 28 sec · Antrill Drive
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4
Turn right onto Green Park Road
1.2 mi · 3 min · Green Park Road
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5
At the end of the road, turn left onto Union Road
1.2 km · 2 min · Union Road
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6
Turn left onto Reavis Barracks Road
68 m · 11 sec · Reavis Barracks Road
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7
Take the ramp slight right toward I 55 North
634 ft · 9 sec
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8
Merge slight left
9.5 mi · 12 min
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9
Keep slight left to continue on Third Street Expressway
2 mi · 3 min · Third Street Expressway
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10
Merge slight right onto Andy Gammon Memorial Highway
1.4 mi · 2 min · Andy Gammon Memorial Highway
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11
Continue on Mark Twain Expressway
2.1 mi · 3 min · Mark Twain Expressway
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12
Take the exit slight right toward West Florissant Avenue
1121 ft · 25 sec
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13
Turn straight onto West Florissant Avenue
1.9 mi · 4 min · West Florissant Avenue
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14
Turn right onto Riverview Boulevard
1.2 mi · 2 min · Riverview Boulevard
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15
Enter the roundabout and take exit 4 toward Halls Ferry Circle
154 m · 10 sec · Halls Ferry Road
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16
Exit the rotary onto Halls Ferry Road
2 mi · 3 min · Halls Ferry Road
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17
Turn right onto Chambers Road
2011 ft · 39 sec · Chambers Road
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18
Turn left onto Lord Drive
2556 ft · 2 min · Lord Drive
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19
Arrive at your destination
0 m · 1 sec · Lord Drive
Car Route Details
A richer read on the saved driving route between Green Park and Castle Point.
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.
I 55 North
Merge slight left
9.48 mi · 00h 12m
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.
Sunny leaving Green Park and Sunny near Castle Point.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Green Park to Castle Point?
The road trip is about 24.1 miles (38.8 km) and usually takes 00h 34m 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?
St. Louis is a useful midpoint, sitting about 11.8 miles from Green Park and 12.3 miles from Castle Point.
How much longer is the road route than the straight-line distance?
The direct path is about 16.9 miles (27.2 km), while the road route adds roughly 7.2 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 7:00 AM to 7:00 PM CDT. If you want a more comfortable same-day return, try to leave by 7:22 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.21 one way or $6.41 round trip. Estimated CO2 is about 7.6 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Green Park and Sunny near Castle Point.
Stop Ideas Near St. Louis
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 St. Louis.
Gateway Transportation Center
Kirkwood
Alton
Washington
Flight Path Map
This map shows the direct air route between Green Park and Castle Point. Straight-line distance: 16.91 mi (27.22 km).
#1 Green Park
City
| Population | 2,614 |
| Coordinates | 38.5236600, -90.3384500 |
| Altitude | 164 |
| Country | United States |
#2 Castle Point
A census-designated place in Jefferson County, Missouri.
| Population | 90,070 |
| Coordinates | 38.7581100, -90.2481700 |
| Altitude | 152 |
| Country | United States |
End: Count Drive (-90.248701, 38.758102)
Estimated Travel Time
Distance: 39 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 48m |
| 40 mph (64.37 km/h) | 00h 36m |
| 50 mph (80.47 km/h) | 00h 28m |
| 60 mph (96.56 km/h) | 00h 24m |
| 70 mph (112.65 km/h) | 00h 20m |
| 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 | $3.77 | $3.21 | $6.41 |
| Mid-grade | $4.25 | $3.62 | $7.23 |
| Premium | $4.65 | $3.96 | $7.91 |
| Diesel | $5.30 | $4.51 | $9.02 |
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 Missouri · 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.