Origin
Saint Peters, MO
Morning in Saint Peters on Tuesday
Local time
7:04 AM
CDT
Current temp
71°F
Unavailable
Live forecast
Trip from Saint Peters, MO to Clayton, MO
Pin this tripCompiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards
Drive Time
37m
Distance
27.2 mi
44 km
Drive Score
7/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$4
one way
EV Charging
Fair
4 stations
Best Time to Leave
4 AM
0h 35m
★
6 AM
0h 38m
8 AM
0h 44m
10 AM
0h 40m
12 PM
0h 40m
3 PM
0h 41m
5 PM
0h 44m
8 PM
0h 36m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Saint Peters, MO
Wikimedia Commons
Clayton, MO
Wikimedia Commons
Trip Overview
Saint Peters, MO to Clayton, MO is 27.2 miles and takes about 37 minutes via I 70 and North Hanley Road, with a fuel budget near $4 and enough daylight to finish in a day. This short hop stays within the Midwest region, specifically Missouri, making it an easy connector between two points without significant mileage. The drive is predominantly highway, so expect efficient travel. It's a straightforward trip, ideal for when you need to get from one area to another quickly without a major time commitment.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 70 | 19.3 mi | 24m |
| North Hanley Road | 3.9 mi | 6m |
| Inner Belt Expressway | 1.5 mi | 1m |
| Saint Charles Rock Road | 0.7 mi | 1m |
| Wydown Boulevard | 0.6 mi | 1m |
| MO 79 | 0.1 mi | <1m |
| Hillvale Drive | <0.1 mi | <1m |
Longest stretch:
I 70
— 19.3 mi, about 24m
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Peters, MO and Clayton, 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
18 mi
·
22 min
·
I 70
Use the straight / slight right lanes.
7
Take the exit
0.4 mi
·
40 sec
Exit 238A
Toward I 170 South: Clayton
Use the slight right lane.
8
Merge onto I 170
1.5 mi
·
1 min
·
Inner Belt Expressway
9
Take the exit
0.1 mi
·
16 sec
Exit 5
Toward MO 180: Saint Charles Rock Road
Use the slight right lane.
10
Keep slight left at fork
426 ft
·
11 sec
Toward MO 180: Saint Charles Rock Road
Use the straight / slight left lanes.
11
Turn left onto MO 180
0.7 mi
·
1 min
·
Saint Charles Rock Road
Use the right lane.
12
Turn right onto North Hanley Road
3.9 mi
·
6 min
·
North Hanley Road
Use the right lane.
13
Turn left onto Wydown Boulevard
0.6 mi
·
1 min
·
Wydown Boulevard
Use the left lane.
14
Turn right onto Hillvale Drive
178 ft
·
7 sec
·
Hillvale Drive
15
Arrive at destination
Hillvale Drive
Heads-up: tricky spots
5 of 135 decision points cluster between mile 1.2 and 21.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
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
7
19.9 mi into trip
|
~25m in
Take the exit toward I 170 South: Clayton
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 238A
Toward I 170 South: Clayton
7
21.7 mi into trip
|
~27m 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 5
Toward MO 180: Saint Charles Rock Road
8
21.8 mi into trip
|
~27m in
Keep slight left at fork toward MO 180: Saint Charles Rock Road
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight left lanes.
Toward MO 180: Saint Charles Rock Road
Fuel & Cost
Regular Gas
$4.25 one way
$8.50 round trip
$3.97/gal
25.4 MPG avg
10 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $4.67 | $9.34 |
| premium | $4.89 | $5.23 | $10.47 |
| diesel | $5.61 | $6.01 | $12.01 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$4
Estimated CO2 emission: 9.5 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 70% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 8.2 | 0 | $2.86 | $1.31 |
| Efficient EV | 6.8 | 0 | $2.38 | $1.09 |
| EV Truck/SUV | 10.9 | 0 | $3.81 | $1.74 |
Gas CO2
10 kg
EV CO2
3 kg (70% 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
Clayton, MO
Morning in Clayton on Tuesday
Local time
7:04 AM
CDT
Current temp
55°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
16 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
37m 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.
What kind of drive is this?
This drive is mostly highway, with 77% of the 27.2 miles on major roads like I 70. You'll experience a longest stretch of 19.3 miles on I 70 before transitioning to surface roads like North Hanley Road. Expect a fairly consistent driving experience with numerous exits typical of interstate travel before reaching your destination.
77% highway — fuel and pacing are the main things to plan.
15 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 19.3 mi on I 70.
How Hard Is This Drive?
10/10
This is a straightforward highway drive that stays mostly on I 70 and North Hanley 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
10/10
Focused - lots of decisions in a short distance, but it is over quickly
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 13 decision points packed into just 27.2 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 37m.
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 19.9 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 37m. Total distance: 27.2 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
37m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (77%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 19.3 miles on I 70. The full list of main roads is in the Roads section above.
Yes — we found about 3 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Clayton, MO before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Yes. At under 2 hours behind the wheel, this works well for families — plan one quick stop if you have younger kids.
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 19.9 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Yes — Gateway Arch National Park. See the National Parks section for detour distances and tips on detours.
Yes. A round trip is manageable in a single day if you plan a break at Clayton, MO before heading back.
How this page is built
Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
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