Origin
Clayton, MO
Morning in Clayton on Tuesday
Local time
8:48 AM
CDT
Current temp
55°F
Unavailable
Live forecast
Trip from Clayton, MO to Saint Peters, 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
33m
Distance
25.1 mi
40 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$4
one way
EV Charging
Fair
3 stations
Best Time to Leave
4 AM
0h 30m
★
6 AM
0h 33m
8 AM
0h 39m
10 AM
0h 35m
12 PM
0h 35m
3 PM
0h 36m
5 PM
0h 39m
8 PM
0h 32m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Clayton, MO
Wikimedia Commons
Saint Peters, MO
Wikimedia Commons
Trip Overview
Clayton, MO to Saint Peters, MO is 25.1 miles and takes about 33m via I 70, with a fuel budget near $4 and enough daylight to finish in a day. This short trip stays within the Midwest region, specifically within Missouri. Given its short distance and mostly highway profile, it's a straightforward drive ideal for a quick transfer or a brief excursion. You'll primarily be on interstate, making it efficient for getting from point A to point B without much fuss.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 70 | 16.8 mi | 20m |
| Inner Belt Expressway | 6.1 mi | 7m |
| Wydown Boulevard | 0.6 mi | 1m |
| Forest Park Parkway | 0.3 mi | <1m |
| Shaw Park Drive | 0.3 mi | <1m |
| South Hanley Road | 0.3 mi | <1m |
| Hillvale Drive | <0.1 mi | <1m |
Longest stretch:
I 70
— 16.8 mi, about 20m
Turn-by-Turn Driving Directions
Step-by-step road directions between Clayton, MO and Saint Peters, MO.
1
Start on Hillvale Drive
178 ft
·
7 sec
·
Hillvale Drive
2
Turn left onto Wydown Boulevard
0.6 mi
·
1 min
·
Wydown Boulevard
3
At end of road, turn right onto South Hanley Road
0.3 mi
·
30 sec
·
South Hanley Road
4
Turn left onto Shaw Park Drive
0.3 mi
·
33 sec
·
Shaw Park Drive
Use the straight / left / right lanes.
5
Take the ramp
294 ft
·
6 sec
Toward Forest Park Parkway West
6
Merge onto Forest Park Parkway
0.3 mi
·
39 sec
·
Forest Park Parkway
Use the straight / slight right lanes.
7
Keep slight right at fork
0.2 mi
·
36 sec
Toward I 170 North
Use the slight right lane.
8
Merge onto I 170
6.1 mi
·
7 min
·
Inner Belt Expressway
Use the straight / slight right lanes.
9
Take the exit
0.4 mi
·
36 sec
Exit 7B
Toward I 70 West: Kansas City
Use the straight / slight left lanes.
10
Merge onto I 70
17 mi
·
20 min
·
I 70
Use the straight lane.
11
Arrive at destination
I 70
Heads-up: tricky spots
5 of 85 decision points cluster between mile 0.9 and 7.9 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
0.9 mi into trip
|
~2m in
|
Shaw Park Drive
Turn left onto Shaw Park Drive
Lane positioning matters here
Use the straight / left / right lanes.
5
1.3 mi into trip
|
~2m in
|
Forest Park Parkway
Merge onto Forest Park Parkway
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
7
1.6 mi into trip
|
~3m in
Keep slight right at fork toward I 170 North
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Toward I 170 North
5
1.8 mi into trip
|
~4m in
|
I 170 / Inner Belt Expressway
Merge onto I 170 / Inner Belt Expressway
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
7
7.9 mi into trip
|
~11m in
Take the exit toward I 70 West: Kansas City
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight left lanes.
Exit 7B
Toward I 70 West: Kansas City
Fuel & Cost
Regular Gas
$3.92 one way
$7.85 round trip
$3.97/gal
25.4 MPG avg
9 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $4.31 | $8.62 |
| premium | $4.89 | $4.83 | $9.66 |
| diesel | $5.61 | $5.54 | $11.08 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$4
Estimated CO2 emission: 8.8 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 7.5 | 0 | $2.64 | $1.20 |
| Efficient EV | 6.3 | 0 | $2.20 | $1.00 |
| EV Truck/SUV | 10 | 0 | $3.51 | $1.61 |
Gas CO2
9 kg
EV CO2
3 kg (67% 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 Peters, MO
Morning in Saint Peters on Tuesday
Local time
8:48 AM
CDT
Current temp
71°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 warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
33m 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 primarily on highways, with 93% of the route utilizing them. You'll experience a long stretch of 16.8 miles on I 70, indicating sustained highway cruising. The highway portion concludes as you approach your destination, transitioning to surface roads for the final segment. Expect a high volume of exits along the interstate portion.
93% highway — fuel and pacing are the main things to plan.
11 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 16.8 mi on I 70.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on I 70 and Inner Belt Expressway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.9 miles in near Shaw Park Drive.
Driving Effort
8/10
Focused - busy navigation packed into a short drive
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 8 decision points packed into just 25.1 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 33m.
Where does it get tricky?
The main spots that need attention: at 0.9 miles (Shaw Park Drive): Lane positioning matters here; at 1.3 miles (Forest Park Parkway): Merge point - match speed before joining. Lane positioning matters here; at 1.6 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 33m. Total distance: 25.1 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
33m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (93%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 16.8 miles on I 70. The full list of main roads is in the Roads section above.
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 Saint Peters, 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 0.9 miles (Shaw Park Drive): Lane positioning matters here; at 1.3 miles (Forest Park Parkway): Merge point - match speed before joining. Lane positioning matters here; at 1.6 miles: Highway fork - watch signs carefully. 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 Saint Peters, 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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