How far is Castle Point, MO from Byrnes Mill, MO?
The driving distance from Castle Point, MO to Byrnes Mill, MO is about 34.8 miles (56 km), with a travel time of about 00h 55m by car.
- The straight-line flight distance is about 28.5 miles (45.9 km).
- For a round trip, plan for roughly 01h 50m 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 55m.
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.
Chance Rain Showers
Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Castle Point and Byrnes Mill.
Turn-by-Turn Driving Directions
Step-by-step road directions between Castle Point and Byrnes Mill.
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1
Start on Lord Drive
2556 ft · 2 min · Lord Drive
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2
At the end of the road, turn right onto Chambers Road
2011 ft · 40 sec · Chambers Road
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3
Turn left onto Halls Ferry Road
1.6 mi · 2 min · Halls Ferry Road
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4
Turn right onto Jennings Station Road
3.3 mi · 7 min · Jennings Station Road
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5
Continue on Kienlen Avenue
1.6 mi · 3 min · Kienlen Avenue
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6
Continue on North Skinker Boulevard
2.8 mi · 5 min · North Skinker Boulevard
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7
Continue on McCausland Avenue
1.6 mi · 3 min · McCausland Avenue
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8
Turn left onto Arsenal Street
1239 ft · 40 sec · Arsenal Street
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9
Turn right onto Jamieson Avenue
625 ft · 15 sec · Jamieson Avenue
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10
Take the ramp slight right toward I 44 West
941 ft · 15 sec
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11
Merge slight left onto Officer Michael Barwick Memorial Highway
1.2 km · 55 sec · Officer Michael Barwick Memorial Highway
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12
Continue on Police Officer Robert Stanze Memorial Highway
2.7 mi · 3 min · Police Officer Robert Stanze Memorial Highway
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13
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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14
Take the exit slight right toward I 270: Memphis, Chicago
2169 ft · 46 sec
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15
Keep slight right to continue on I 270: Memphis, Chicago
749 ft · 16 sec
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16
Keep slight left to continue on I 270 South: Memphis
3124 ft · 1 min
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17
Merge slight left
1.5 mi · 2 min
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18
Take the exit slight right toward MO 30: Gravois Road
1580 ft · 34 sec
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19
Keep slight right to continue on MO 30 West: Fenton
93 m · 8 sec
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20
Merge slight left
11.1 mi · 15 min
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21
Take the exit slight right toward Upper Byrnes Mill Road
33 m · 3 sec
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22
Turn slight right onto Upper Byrnes Mill Road
1.4 mi · 4 min · Upper Byrnes Mill Road
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23
Arrive at your destination
0 m · 1 sec · Upper Byrnes Mill Road
Car Route Details
A richer read on the saved driving route between Castle Point and Byrnes Mill.
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 West
Merge slight left
11.1 mi · 00h 15m
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.
Chance Rain Showers leaving Castle Point and Chance Showers And Thunderstorms near Byrnes Mill.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Castle Point to Byrnes Mill?
The road trip is about 34.8 miles (56 km) and usually takes 00h 55m 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 17.4 miles from Castle Point and 17.4 miles from Byrnes Mill.
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 6.3 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 4:40 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $5.13 one way or $10.26 round trip. Estimated CO2 is about 12.1 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers around Castle Point and Chance Showers And Thunderstorms near Byrnes Mill.
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 Castle Point and Byrnes Mill. Straight-line distance: 28.53 mi (45.92 km).
#1 Castle Point
A census-designated place in Jefferson County, Missouri.
| Population | 90,070 |
| Coordinates | 38.7581100, -90.2481700 |
| Altitude | 152 |
| Country | United States |
#2 Byrnes Mill
City in Jefferson County, Missouri, United States
| Population | 3,015 |
| Coordinates | 38.4378300, -90.5817900 |
| Altitude | 143 |
| Country | United States |
End: Byrnes Mill (-90.58179, 38.43783)
Estimated Travel Time
Distance: 56 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 09m |
| 40 mph (64.37 km/h) | 00h 52m |
| 50 mph (80.47 km/h) | 00h 41m |
| 60 mph (96.56 km/h) | 00h 34m |
| 70 mph (112.65 km/h) | 00h 29m |
| 80 mph (129 km/h) | 00h 26m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $5.13 | $10.26 |
| Mid-grade | $4.25 | $5.78 | $11.57 |
| Premium | $4.65 | $6.33 | $12.66 |
| Diesel | $5.30 | $7.21 | $14.43 |
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 12, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.