How far is Byrnes Mill, MO from Castle Point, MO?
The driving distance from Byrnes Mill, MO to Castle Point, MO is about 40.6 miles (65.4 km), with a travel time of about 00h 49m by car.
- The straight-line flight distance is about 28.5 miles (45.9 km).
- For a round trip, plan for roughly 01h 39m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM CDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 49m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
City in Missouri
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Byrnes Mill and Castle Point.
Turn-by-Turn Driving Directions
Step-by-step road directions between Byrnes Mill and Castle Point.
-
1
Start on Upper Byrnes Mill Road
1.4 mi · 4 min · Upper Byrnes Mill Road
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2
Merge right
1695 ft · 24 sec
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3
Take the exit left toward MO 30 East
36 m · 2 sec
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4
Merge slight right
11.6 mi · 16 min
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5
Take the exit left toward I 270 North
2202 ft · 35 sec
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6
Merge slight left
1.6 mi · 2 min
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7
Take the exit slight right toward I 44 East, US 50 East, MO 366 East: Saint Louis
2087 ft · 36 sec
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8
Keep slight left to continue on I 44 East, US 50 East: Saint Louis
2184 ft · 34 sec
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9
Merge slight left onto Henry Shaw Ozark Corridor
142 m · 7 sec · Henry Shaw Ozark Corridor
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10
Continue on Police Officer Ernest M. Brockman Sr. Memorial Highway
3.5 mi · 4 min · Police Officer Ernest M. Brockman Sr. Memorial Highway
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11
Continue on Police Officer Robert Stanze Memorial Highway
2.7 mi · 3 min · Police Officer Robert Stanze Memorial Highway
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12
Continue on Officer Michael Barwick Memorial Highway
1 km · 48 sec · Officer Michael Barwick Memorial Highway
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13
Take the exit slight right toward Jamieson Avenue
651 ft · 14 sec
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14
Keep slight left to continue on Jamieson Avenue
69 m · 7 sec
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15
Turn left onto Jamieson Avenue
1486 ft · 47 sec · Jamieson Avenue
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16
At the end of the road, turn left onto Arsenal Street
1198 ft · 38 sec · Arsenal Street
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17
Turn right onto McCausland Avenue
1.6 mi · 3 min · McCausland Avenue
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18
Continue on South Skinker Boulevard
2.8 mi · 5 min · South Skinker Boulevard
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19
Continue on Kienlen Avenue
1.6 mi · 3 min · Kienlen Avenue
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20
Continue on Jennings Station Road
3.3 mi · 7 min · Jennings Station Road
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21
Turn left onto Halls Ferry Road
1.6 mi · 3 min · Halls Ferry Road
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22
Turn right onto Chambers Road
2011 ft · 39 sec · Chambers Road
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23
Turn left onto Lord Drive
2556 ft · 2 min · Lord Drive
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24
Arrive at your destination
0 m · 1 sec · Lord Drive
Car Route Details
A richer read on the saved driving route between Byrnes Mill 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.
MO 30 East
Merge slight right
11.6 mi · 00h 16m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Sunny leaving Byrnes Mill and Mostly Sunny near Castle Point.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Byrnes Mill to Castle Point?
The road trip is about 40.6 miles (65.4 km) and usually takes 00h 49m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Crestwood is a useful midpoint, sitting about 17.8 miles from Byrnes Mill and 22.9 miles from Castle Point.
How much longer is the road route than the straight-line distance?
The direct path is about 28.5 miles (45.9 km), while the road route adds roughly 12.1 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 8:00 AM to 10:00 AM CDT. If you want a more comfortable same-day return, try to leave by 4:50 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.39 one way or $10.79 round trip. Estimated CO2 is about 12.7 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Byrnes Mill and Mostly Sunny near Castle Point.
Stop Ideas Near Crestwood
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 Crestwood.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between Byrnes Mill and Castle Point. Straight-line distance: 28.53 mi (45.92 km).
#1 Byrnes Mill
City in Jefferson County, Missouri, United States
| Population | 3,015 |
| Coordinates | 38.4378300, -90.5817900 |
| Altitude | 143 |
| 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: 65 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 21m |
| 40 mph (64.37 km/h) | 01h 00m |
| 50 mph (80.47 km/h) | 00h 48m |
| 60 mph (96.56 km/h) | 00h 40m |
| 70 mph (112.65 km/h) | 00h 34m |
| 80 mph (129 km/h) | 00h 30m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $5.39 | $10.79 |
| Mid-grade | $4.25 | $6.08 | $12.16 |
| Premium | $4.65 | $6.66 | $13.31 |
| Diesel | $5.30 | $7.58 | $15.17 |
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 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.