Origin
Affton, MO
Night in Affton on Saturday
Local time
11:18 PM
CDT
Current temp
63°F
Unavailable
Live forecast
Trip from Affton, 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
35m
Distance
31.5 mi
51 km
Drive Score
5/10
Practical drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Fair
3 stations
Best Time to Leave
4 AM
0h 32m
★
6 AM
0h 35m
8 AM
0h 41m
10 AM
0h 37m
12 PM
0h 37m
3 PM
0h 38m
5 PM
0h 41m
8 PM
0h 33m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Affton, MO
Wikimedia Commons
Saint Peters, MO
Wikimedia Commons
Trip Overview
This 31.5-mile drive from Affton, MO, to Saint Peters, MO, is a short one, clocking in at just 35 minutes. It's a perfect candidate for a single-day trip, requiring no overnight stays. You'll primarily navigate using Gravois Road, I 270 North, and I 70, with no significant highway mileage. The profile suggests a 'turn-heavy local drive,' so expect a route that winds through communities rather than a direct interstate blast. With an estimated fuel cost of $5, this is an economical excursion. This journey stays within the Midwest region, offering a familiar landscape throughout.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| Gravois Road | — | — |
| I 270 North | — | — |
| I 70 | — | — |
| I 70 West | — | — |
Some road-level metrics are being recalculated.
Longest stretch:
Gravois Road
— detailed segment metrics are refreshing.
Turn-by-Turn Driving Directions
Step-by-step road directions between Affton, MO and Saint Peters, MO.
1
Start on the route
266 ft
·
20 sec
·
the route
2
Turn slight right
66 ft
·
5 sec
3
Turn right onto Gravois Road
210 ft
·
11 sec
·
Gravois Road
4
Continue on Gravois Road
4.0 mi
·
7 min
·
Gravois Road
5
Take the ramp slight right toward I 270 North
0.4 mi
·
33 sec
·
I 270 North
6
Merge slight left
15 mi
·
18 min
7
Take the exit slight right toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
1.0 mi
·
1 min
·
I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
8
Keep slight left to continue on I 70 West: Kansas City
0.1 mi
·
11 sec
·
I 70 West: Kansas City
9
Continue on I 70 West: Kansas City
0.6 mi
·
57 sec
·
I 70 West: Kansas City
10
Merge slight left
11 mi
·
13 min
11
Arrive at your destination
Fuel & Cost
Regular Gas
$4.92 one way
$9.85 round trip
$3.97/gal
25.4 MPG avg
11 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $5.41 | $10.81 |
| premium | $4.89 | $6.06 | $12.12 |
| diesel | $5.61 | $6.95 | $13.91 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 11 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 64% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 9.5 | 0 | $3.31 | $1.51 |
| Efficient EV | 7.9 | 0 | $2.76 | $1.26 |
| EV Truck/SUV | 12.6 | 0 | $4.41 | $2.02 |
Gas CO2
11 kg
EV CO2
4 kg (64% 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
11:18 PM
CDT
Current temp
57°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
6 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
35m 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 route is characterized as a 'turn-heavy local drive,' meaning you won't be on the highway for the entirety of your 31.5-mile journey. With 0% highway share, prepare for frequent turns and a more community-focused experience. The longest uninterrupted stretch isn't specified, but the 'turn-heavy' nature implies that you'll be making numerous directional changes. This drive will likely feel more like navigating through towns and local roads rather than a continuous, high-speed cruise. Expect a pace that allows for observation of your surroundings as you make your way from Affton to Saint Peters.
Only 0% highway — the rest is turn-by-turn surface driving.
11 navigation steps total — most of the decisions cluster near the start and finish.
Main road: Gravois Road.
How Hard Is This Drive?
1/10
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. Navigation is very simple - set it and forget it for most of the drive.
Driving Effort
1/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from Affton, MO to Saint Peters, MO is easy. At 35m with 0% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
This route does not have any notably tricky sections. Most of the drive from Affton, MO to Saint Peters, MO is straightforward, with well-signed roads and simple exits.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 35m. Total distance: 31.5 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
35m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (0%). Straightforward navigation.
Scenic Drive
Mostly surface roads route profile.
Frequently Asked Questions
Yes. At under 2 hours behind the wheel, this works well for families — plan one quick stop if you have younger kids.
This route does not have any notably tricky sections. Most of the drive from Affton, MO to Saint Peters, MO is straightforward, with well-signed roads and simple exits.
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, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
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