Origin
Saint Peters, MO
Afternoon in Saint Peters on Thursday
Local time
3:44 PM
CDT
Current temp
57°F
Unavailable
Live forecast
Trip from Saint Peters, MO to Saint Johns, MO
Last recalculated Apr 16, 2026
Drive Time
30m
Distance
20.7 mi
33 km
Drive Score
7/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$3
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 28m
★
6 AM
0h 30m
8 AM
0h 35m
10 AM
0h 32m
12 PM
0h 32m
3 PM
0h 32m
5 PM
0h 35m
8 PM
0h 29m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Saint Peters, MO
Wikimedia Commons
Saint Johns, MO
Abdel Achkouk
Trip Overview
The drive from Saint Peters, MO to Saint Johns, MO covers 20.7 miles and takes about 30m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on I 70, Saint Charles Rock Road, Walton Road for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 14.8 miles on I 70. At current regular gas prices, budget about $3.24 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 30m. Total distance: 20.7 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
30m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (72%). Some complex stretches to watch for.
Drive Character
This is a 30m highway drive covering 20.7 miles, with most of the trip on I 70 and Saint Charles Rock Road. The longest continuous stretch is about 14.8 miles on I 70.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 13 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 14.8 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 70 and Saint Charles Rock Road. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 1.2 miles in.
Driving Effort
7/10
Focused - busy navigation packed into a short drive
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 10 decision points packed into just 20.7 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 30m.
Where does it get tricky?
The main spots that need attention: at 1.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 1.3 miles: Highway fork - watch signs carefully; at 1.5 miles: Lane positioning matters here.
Critical Maneuvers
5 of 10 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
8
1.2 mi into trip
|
~1m in
Take the exit toward MO 79: Elsberry, Louisiana
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 220
Toward MO 79: Elsberry, Louisiana
6
1.3 mi into trip
|
~1m in
Keep slight left at fork toward MO 79
Highway fork - watch signs carefully
Toward MO 79
6
1.5 mi into trip
|
~2m in
Take the ramp toward I 70 East
Lane positioning matters here
Use the right lane.
Toward I 70 East
5
1.7 mi into trip
|
~2m in
|
I 70
Merge onto I 70
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
7
15.4 mi into trip
|
~19m in
Take the exit toward MO 180: Saint Charles Rock Road
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 234
Toward MO 180: Saint Charles Rock Road
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Saint Peters, MO to Saint Johns, MO, road signs begin pointing toward Louisiana along the way.
Louisiana
1.2 mi in
|
~1m
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 70 | 14.8 mi | 18m |
| Saint Charles Rock Road | 4.5 mi | 7m |
| Walton Road | 0.5 mi | 1m |
| MO 79 | 0.1 mi | <1m |
| Betty Lee Avenue | <0.1 mi | <1m |
| Hilleman Avenue | <0.1 mi | <1m |
Longest stretch:
I 70
— 14.8 mi, about 18m
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Peters, MO and Saint Johns, MO.
1
Start on I 70
1.2 mi
·
1 min
·
I 70
2
Take the exit
0.1 mi
·
15 sec
Exit 220
Toward MO 79: Elsberry, Louisiana
Use the straight / slight right lanes.
3
Keep slight left at fork
384 ft
·
14 sec
Toward MO 79
4
Turn left onto MO 79
0.1 mi
·
11 sec
·
MO 79
5
Take the ramp
0.2 mi
·
18 sec
Toward I 70 East
Use the right lane.
6
Merge onto I 70
14 mi
·
17 min
·
I 70
Use the straight / slight right lanes.
7
Take the exit
0.3 mi
·
31 sec
Exit 234
Toward MO 180: Saint Charles Rock Road
Use the slight right lane.
8
Turn right onto MO 180
0.7 mi
·
1 min
·
Saint Charles Rock Road
Use the right lane.
9
Continue on MO 180
3.8 mi
·
6 min
·
Saint Charles Rock Road
Use the left lane.
10
Turn left onto Walton Road
0.5 mi
·
1 min
·
Walton Road
11
At end of road, turn left onto Betty Lee Avenue
457 ft
·
22 sec
·
Betty Lee Avenue
12
Turn right onto Hilleman Avenue
105 ft
·
4 sec
·
Hilleman Avenue
13
Arrive at destination
Hilleman Avenue
Fuel & Cost
Regular Gas
$3.24 one way
$6.47 round trip
$3.97/gal
25.4 MPG avg
7 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $3.55 | $7.11 |
| premium | $4.89 | $3.98 | $7.97 |
| diesel | $5.61 | $4.57 | $9.14 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$3
Estimated CO2 emission: 7.2 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $2 in charging · 0 stops · 71% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 6.2 | 0 | $2.17 | $0.99 |
| Efficient EV | 5.2 | 0 | $1.81 | $0.83 |
| EV Truck/SUV | 8.3 | 0 | $2.90 | $1.32 |
Gas CO2
7 kg
EV CO2
2 kg (71% 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.
Destination
Saint Johns, MO
Afternoon in Saint Johns on Thursday
Local time
3:44 PM
CDT
Current temp
78°F
Unavailable
Live forecast
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
21 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
30m 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 Saint Peters, MO to Saint Johns, MO covers 20.7 miles and takes about 30m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 70, Saint Charles Rock Road, Walton Road. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 10.4 miles from Saint Peters, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $3.24 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.
This is a short but busy drive. With 10 decision points packed into just 20.7 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 30m.
The main spots that need attention: at 1.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 1.3 miles: Highway fork - watch signs carefully; at 1.5 miles: Lane positioning matters here.
On the drive from Saint Peters, MO to Saint Johns, MO, road signs begin pointing toward Louisiana along the way.
Yes. Nearby national parks include Gateway Arch National Park.
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