Origin
Gray Summit, MO
Night in Gray Summit on Saturday
Local time
11:22 PM
CDT
Current temp
77°F
Unavailable
Live forecast
Trip from Gray Summit, MO to Saint Peters, MO
Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 19, 2026 · Editorial standards
Drive Time
53m
Distance
33.6 mi
54 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Good
8 stations
Best Time to Leave
4 AM
0h 49m
★
6 AM
0h 53m
8 AM
1h 2m
10 AM
0h 56m
12 PM
0h 55m
3 PM
0h 57m
5 PM
1h 2m
8 PM
0h 51m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Gray Summit, MO
Матвей Ильин
Saint Peters, MO
Wikimedia Commons
Trip Overview
If you are looking to travel between Gray Summit and Saint Peters, you are looking at a manageable 33.6-mile trek across Missouri. Expect to spend about 53 minutes behind the wheel, making this a perfect candidate for a straightforward day trip. With a fuel budget of just $5, it is an incredibly economical route that requires no overnight stops. Your journey transitions you through the Midwest landscape, moving from the area around Gray Summit toward the Saint Peters corridor. This is a practical, no-nonsense drive that gets you from point A to point B efficiently. Whether you are commuting or heading out for a quick visit, the simplicity of this trip makes it a reliable choice for your schedule.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| MO 100 | 12.8 mi | 17m |
| MO 109 | 4.9 mi | 7m |
| Mid Rivers Mall Drive | 4.7 mi | 9m |
| MO 94 | 3.4 mi | 4m |
| Avenue of the Saints | 2.7 mi | 3m |
| South Eatherton Road | 2.4 mi | 4m |
| Olive Street Road | 0.9 mi | 1m |
| Chesterfield Airport Road | 0.7 mi | 1m |
Longest stretch:
MO 100
— 12.8 mi, about 17m
Turn-by-Turn Driving Directions
Step-by-step road directions between Gray Summit, MO and Saint Peters, MO.
1
Start on MO 100
13 mi
·
17 min
·
MO 100
2
Take the exit
0.2 mi
·
30 sec
Toward MO 109
3
Enter roundabout onto MO 109
224 ft
·
4 sec
·
MO 109
4
Continue on MO 109
515 ft
·
10 sec
·
MO 109
5
Enter roundabout onto MO 109
98 ft
·
1 sec
·
MO 109
6
Continue on MO 109
0.4 mi
·
45 sec
·
MO 109
7
Enter roundabout onto MO 109
94 ft
·
2 sec
·
MO 109
8
Continue on MO 109
4.3 mi
·
6 min
·
MO 109
9
Enter roundabout onto South Eatherton Road
94 ft
·
1 sec
·
South Eatherton Road
10
Continue on South Eatherton Road
2.4 mi
·
4 min
·
South Eatherton Road
11
Continue on Olive Street Road
0.9 mi
·
1 min
·
Olive Street Road
12
Take the ramp onto Chesterfield Airport Road
0.7 mi
·
1 min
·
Chesterfield Airport Road
13
Merge onto I 64; US 40; US 61
2.7 mi
·
3 min
·
Avenue of the Saints
Use the straight lane.
14
Take the exit
0.2 mi
·
15 sec
Exit 10
Toward MO 94: Defiance, Saint Charles
Use the slight right lane.
15
Keep slight right at fork
313 ft
·
4 sec
Toward MO 94 East: Saint Charles
Use the right lane.
16
Merge onto MO 94
3.4 mi
·
4 min
·
MO 94
Use the right lane.
17
Keep slight right at fork
0.2 mi
·
22 sec
Toward Mid Rivers Mall Drive, Pitman Hill Road
Use the straight / slight right lanes.
18
Turn left onto Mid Rivers Mall Drive
4.7 mi
·
9 min
·
Mid Rivers Mall Drive
Use the left / straight lanes.
19
Take the ramp
0.3 mi
·
20 sec
Toward I 70 West: Wentzville
Use the slight left lane.
20
Merge onto I 70
479 ft
·
6 sec
·
I 70
21
Arrive at destination
I 70
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Mid-route town
Meal stop
17 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 33.6 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 16.8 miles from Gray Summit, MO, which is a good place for a longer meal and fuel stop.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Heads-up: tricky spots
5 of 145 decision points cluster between mile 13 and 28.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
13 mi into trip
|
~18m in
|
MO 109
Enter roundabout onto MO 109
Roundabout - know your exit number before entering
5
13.2 mi into trip
|
~18m in
|
MO 109
Enter roundabout onto MO 109
Roundabout - know your exit number before entering
8
24.6 mi into trip
|
~37m in
Take the exit toward MO 94: Defiance, Saint Charles
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 10
Toward MO 94: Defiance, Saint Charles
8
24.8 mi into trip
|
~37m in
Keep slight right at fork toward MO 94 East: Saint Charles
Highway fork - watch signs carefully. Lane positioning matters here
Use the right lane.
Toward MO 94 East: Saint Charles
8
28.3 mi into trip
|
~42m in
Keep slight right at fork toward Mid Rivers Mall Drive, Pitman Hill Road
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward Mid Rivers Mall Drive, Pitman Hill Road
Fuel & Cost
Regular Gas
$5.25 one way
$10.51 round trip
$3.97/gal
25.4 MPG avg
12 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $5.77 | $11.54 |
| premium | $4.89 | $6.47 | $12.93 |
| diesel | $5.61 | $7.42 | $14.84 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 11.8 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $4 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 10.1 | 0 | $3.53 | $1.61 |
| Efficient EV | 8.4 | 0 | $2.94 | $1.34 |
| EV Truck/SUV | 13.4 | 0 | $4.70 | $2.15 |
Gas CO2
12 kg
EV CO2
4 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
Night in Saint Peters on Saturday
Local time
11:22 PM
CDT
Current temp
57°F
Unavailable
Live forecast
75°F
Wildwood, MO
17 mi in
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
20 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
53m 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 trip functions as a highway-focused drive, with 63% of your mileage spent on major roads. You will rely on a combination of MO 100, MO 109, and Mid Rivers Mall Drive to navigate the distance. Expect a varied experience behind the wheel, starting with your longest uninterrupted stretch of 12.8 miles on MO 100. As you transition between these routes, the character of the drive shifts from regional highway transit into the more developed local flow of Mid Rivers Mall Drive. It is a steady, functional path that keeps you moving consistently toward your destination without the need for complex detours.
63% highway — fuel and pacing are the main things to plan.
21 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 12.8 mi on MO 100.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on MO 100 and MO 109. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 13 miles in near MO 109.
Driving Effort
9/10
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 14 decision points packed into just 33.6 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 53m.
Where does it get tricky?
The main spots that need attention: at 13 miles (MO 109): Roundabout - know your exit number before entering; at 13.2 miles (MO 109): Roundabout - know your exit number before entering; at 24.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
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 Gray Summit, MO to Saint Peters, MO, road signs begin pointing toward Saint Charles along the way.
Saint Charles
24.6 mi in
|
~37m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 53m. Total distance: 33.6 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
53m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (63%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 12.8 miles on MO 100. 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 13 miles (MO 109): Roundabout - know your exit number before entering; at 13.2 miles (MO 109): Roundabout - know your exit number before entering; at 24.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
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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