Castle Point to Saint Martins is 135.4 miles and takes about 2 hours 42 minutes via I 70, US 54, and Rosemary Straub Davison Highway, with a fuel budget near $21 and enough daylight to finish in a day. This trip stays within Missouri, moving from the Midwest region to another part of the Midwest. It's a straightforward drive that's mostly highway, making it a practical choice for a single-day excursion. You'll find the journey efficient, allowing you to reach your destination with plenty of time to spare.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
67.7 miles from Castle Point, MO
A natural place for your longest stop of the day
, about 1h 24m into the drive
.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 2h 42m. Total distance: 135.4 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
2h 42m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (90%). Some complex stretches to watch for.
Drive Character
This drive is predominantly highway-focused, with about 90% of the route utilizing major roads like I 70 and US 54. Expect a consistent, high-speed experience for much of the journey. The longest uninterrupted stretch you'll encounter is 84.1 miles on I 70, so plan for a significant period of steady driving. While it's primarily highway, there's a brief section on Rosemary Straub Davison Highway that might offer a slight change of pace before you reach your destination.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 23 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 70 is the longest continuous segment at about 84.1 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 70 and US 54. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 11 miles in.
Driving Effort10/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 20 significant decision points across 135.4 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 11 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 11.8 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 96.3 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Critical Maneuvers
5 of 20 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
6
11 mi into trip|~17m in
Take the exit toward I 70: Saint Louis, Kansas City
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 20A
Toward I 70: Saint Louis, Kansas City
8
11.8 mi into trip|~18m in
Keep slight right at fork toward I 70 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Exit 20B
Toward I 70 West: Kansas City
6
96.3 mi into trip|~1h 57m in
Take the exit toward US 54: Auxvasse, Mexico, Fulton
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 148
Toward US 54: Auxvasse, Mexico, Fulton
7
126.2 mi into trip|~2h 30m in|US 63
Keep slight left at fork onto US 63 toward US 63 South, US 50
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward US 63 South, US 50
8
126.4 mi into trip|~2h 31m in
Keep slight right at fork toward US 50 West: Sedalia
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Toward US 50 West: Sedalia
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Castle Point, MO and Saint Martins, MO, road signs point toward Kansas City, Mexico and Fulton.
Kansas City
11 mi in|~17m
Mexico
96.3 mi in|~1h 57m
Fulton
96.3 mi in|~1h 57m
Main Roads
Road
Distance
Duration
I 70
84.1 mi
1h 38m
US 54
29.6 mi
32m
Rosemary Straub Davison Highway
8.6 mi
10m
US 50
7.6 mi
8m
Business 50 West
0.7 mi
1m
New Halls Ferry Road
0.7 mi
1m
Dunn Road
0.4 mi
<1m
Halls Ferry Road
0.3 mi
<1m
Longest stretch:
I 70
— 84.1 mi, about 1h 38m
Turn-by-Turn Driving Directions
Step-by-step road directions between Castle Point, MO and Saint Martins, MO.
1
Start on Lord Drive
284 ft·14 sec·Lord Drive
2
Turn right onto Duchess Drive
0.2 mi·53 sec·Duchess Drive
3
Turn right onto Edgefield Drive
0.3 mi·1 min·Edgefield Drive
4
Turn left onto Hudson Drive
0.3 mi·1 min·Hudson Drive
5
At end of road, turn right onto MO AC
0.3 mi·29 sec·Halls Ferry Road
6
Keep slight left at fork onto MO AC
0.7 mi·1 min·New Halls Ferry Road
7
Turn left onto Dunn Road
0.4 mi·53 sec·Dunn Road
Use the left lane.
8
Take the ramp
0.3 mi·33 sec
Toward I 270 West
9
Merge onto I 270
8.6 mi·10 min·Rosemary Straub Davison Highway
Use the straight / slight right lanes.
10
Take the exit
0.3 mi·25 sec
Exit 20AToward I 70: Saint Louis, Kansas City
11
Continue on this road
0.5 mi·42 sec·this road
Exit 20A-BToward I 70: Saint Louis, Kansas CityUse the slight left / slight right lanes.
12
Keep slight right at fork
0.5 mi·41 sec
Exit 20BToward I 70 West: Kansas CityUse the slight right lane.
13
Merge onto I 70
84 mi·1 hr 38 min·I 70
Use the straight / slight right lanes.
14
Take the exit
0.2 mi·27 sec
Exit 148Toward US 54: Auxvasse, Mexico, Fulton
15
Turn left onto US 54
30 mi·32 min·US 54
16
Take the exit onto US 63
217 ft·4 sec·US 63
Toward US 63 South, US 50
17
Keep slight left at fork onto US 63
0.1 mi·16 sec·US 63
Toward US 63 South, US 50
18
Keep slight right at fork
0.2 mi·29 sec
Toward US 50 West: SedaliaUse the slight right lane.
19
Merge onto US 50
7.6 mi·8 min·US 50
20
Take the exit
0.4 mi·46 sec
Toward MO D, MO T: Saint Martins, Lohman
21
Turn right onto MO T
0.2 mi·20 sec·Lomo Drive
22
Turn left onto Business 50 West
0.7 mi·1 min·Business 50 West
23
Arrive at destination
Business 50 West
Trip Plan
Given the relatively short duration of 2 hours 42 minutes, this trip is easily completed in a single day. You could depart Castle Point anytime in the morning and still arrive in Saint Martins with ample daylight. With only one recommended stop implicit in the data, you have a lot of flexibility in pacing. Keep an eye on your fuel gauge, especially before embarking on the 84.1-mile stretch on I 70, to ensure you don't need to deviate from your path for gas.
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 67.7 miles from Castle Point, MO, or about 1h 24m into the drive.
The longest continuous stretch on this route runs about 84.1 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 30 miles or 39m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 67.7 miles or 1h 24m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 14m
Traffic, exits, and arrival timing usually matter more near Saint Martins, MO than in the middle of the route.
Before You Leave
+
Open the route before leaving Castle Point, MO so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Castle Point, MO
This is one driving day of about 135.4 miles and 2h 42m.
Your first comfortable stop window is around 30 miles from Castle Point, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on I 70 for about 84.1 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 67.7 mi from Castle Point, MO
· 1h 24m into the drive
Place data sourced from public business listings. Hours and availability may vary.
National Parks Near This Route
Worth a detour if your schedule allows.
Gateway Arch National Park
National Park
Gateway Arch National Park commemorates President Jefferson’s vision of a continental nation, the individuals and cultural groups who helped shape its history, St. Louis’ role in westward expansion, a...
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$21.17 one way
$42.34 round trip
$3.97/gal25.4 MPG avg47 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$23.24
$46.48
premium
$4.89
$26.06
$52.11
diesel
$5.61
$29.89
$59.79
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$21
Meals
$25–$50
Total
$46–$71
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 47.4 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $14 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
40.6
0
$14.22
$6.50
Efficient EV
33.9
0
$11.85
$5.42
EV Truck/SUV
54.2
0
$18.96
$8.67
Gas CO2
47 kg
EV CO2
16 kg (66% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Apr 15, 2026
Origin
Castle Point, MO
Late night
in Castle Point on Saturday
Local time
12:57 AM
CDT
Current temp
58°F
Unavailable
Live forecast
Destination
Saint Martins, MO
Late night
in Saint Martins on Saturday
Local time
12:57 AM
CDT
Current temp
57°F
Unavailable
Live forecast
60°F
Warrenton, MO
68 mi in
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
1 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
2h 42m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Castle Point, MO to Saint Martins, MO covers 135.4 miles and takes about 2h 42m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 70, US 54, Rosemary Straub Davison Highway. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 67.7 miles from Castle Point, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $21.17 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
Plan about 1 meaningful break for fuel, food, or rest. A short stop every 2 to 3 hours is enough for this drive.
This is a demanding drive. With 20 significant decision points across 135.4 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
The main spots that need attention: at 11 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 11.8 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 96.3 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one.
Between Castle Point, MO and Saint Martins, MO, road signs point toward Kansas City, Mexico and Fulton.
