Origin
Fenton, MO
Night in Fenton on Saturday
Local time
11:18 PM
CDT
Current temp
80°F
Unavailable
Live forecast
Trip from Fenton, 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
40m
Distance
30.9 mi
50 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Fair
3 stations
Best Time to Leave
4 AM
0h 37m
★
6 AM
0h 40m
8 AM
0h 47m
10 AM
0h 43m
12 PM
0h 42m
3 PM
0h 43m
5 PM
0h 47m
8 PM
0h 38m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Fenton, MO
Wikimedia Commons
Saint Peters, MO
Wikimedia Commons
Trip Overview
Fenton, MO to Saint Peters, MO is 30.9 miles and takes about 40m via I 270 and I 70, with a fuel budget near $5 and enough daylight to finish in a day. This drive stays within Missouri, connecting two points in the Midwest region. It's a short, mostly highway trip, making it ideal for a quick hop between suburban areas. Given its limited distance and duration, you'll likely find it's an easy day trip with plenty of flexibility for timing. Consider this route if you're looking for a straightforward connection without extensive travel time.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 270 | 14.7 mi | 18m |
| I 70 | 10.5 mi | 13m |
| MO 30 | 2.5 mi | 3m |
| Gravois Road | 0.3 mi | <1m |
| Main Street | 0.2 mi | <1m |
| MO 141 | 0.1 mi | <1m |
Longest stretch:
I 270
— 14.7 mi, about 18m
Turn-by-Turn Driving Directions
Step-by-step road directions between Fenton, MO and Saint Peters, MO.
1
Start on Main Street
0.2 mi
·
35 sec
·
Main Street
2
At end of road, turn right onto Gravois Road
0.3 mi
·
50 sec
·
Gravois Road
3
Turn right onto MO 141
0.1 mi
·
19 sec
·
MO 141
Use the right lane.
4
Take the exit
0.2 mi
·
17 sec
Toward MO 30 East: Saint Louis
5
Merge onto MO 30
2.5 mi
·
3 min
·
MO 30
Use the straight lane.
6
Take the exit
0.4 mi
·
35 sec
Toward I 270 North
7
Merge onto I 270
15 mi
·
18 min
·
I 270
Use the straight lane.
8
Take the exit
1.0 mi
·
1 min
Exit 20A
Toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
Use the slight right lane.
9
Keep slight left at fork
0.1 mi
·
11 sec
Toward I 70 West: Kansas City
Use the slight left lane.
10
Continue on this road
0.6 mi
·
57 sec
·
this road
Exit 20B
Toward I 70 West: Kansas City
11
Merge onto I 70
11 mi
·
13 min
·
I 70
Use the straight / slight right lanes.
12
Arrive at destination
I 70
Heads-up: tricky spots
5 of 95 decision points cluster between mile 0.5 and 19.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.5 mi into trip
|
~1m in
|
MO 141
Turn right onto MO 141
Lane positioning matters here
Use the right lane.
6
0.6 mi into trip
|
~1m in
Take the exit toward MO 30 East: Saint Louis
Exit ramp - move to the correct lane early
Toward MO 30 East: Saint Louis
5
0.9 mi into trip
|
~2m in
|
MO 30
Merge onto MO 30
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
8
18.5 mi into trip
|
~24m in
Take the exit toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
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 20A
Toward I 70: Kansas City, Saint Louis, Saint Lo...
7
19.6 mi into trip
|
~26m in
Keep slight left at fork toward I 70 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left lane.
Toward I 70 West: Kansas City
Fuel & Cost
Regular Gas
$4.83 one way
$9.66 round trip
$3.97/gal
25.4 MPG avg
11 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $5.30 | $10.61 |
| premium | $4.89 | $5.95 | $11.89 |
| diesel | $5.61 | $6.82 | $13.64 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 10.8 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 | 9.3 | 0 | $3.24 | $1.48 |
| Efficient EV | 7.7 | 0 | $2.70 | $1.24 |
| EV Truck/SUV | 12.4 | 0 | $4.33 | $1.98 |
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
23 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
40m 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 is heavily highway-focused, with 90% of the journey on major interstates. You'll experience a 14.7-mile stretch primarily on I 270, offering a consistent, fast-paced driving experience. The route relies on I 270 and I 70, so expect smooth pavement and predictable conditions for most of the 30.9 miles. While it's a highway-centric profile, the transition between I 270 and I 70 is seamless, keeping you moving efficiently towards your destination. The character is straightforward interstate travel.
90% highway — fuel and pacing are the main things to plan.
12 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 14.7 mi on I 270.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on I 270 and I 70. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.5 miles in near MO 141.
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 9 decision points packed into just 30.9 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 40m.
Where does it get tricky?
The main spots that need attention: at 0.5 miles (MO 141): Lane positioning matters here; at 0.6 miles: Exit ramp - move to the correct lane early; at 0.9 miles (MO 30): Merge point - match speed before joining. Lane positioning matters here.
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.
Between Fenton, MO and Saint Peters, MO, road signs point toward Saint Louis and Saint Louis Lambert International Airport.
Saint Louis
18.5 mi in
|
~24m
Saint Louis Lambert International Airport
18.5 mi in
|
~24m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 40m. Total distance: 30.9 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
40m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (90%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 14.7 miles on I 270. 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 0.5 miles (MO 141): Lane positioning matters here; at 0.6 miles: Exit ramp - move to the correct lane early; at 0.9 miles (MO 30): Merge point - match speed before joining. Lane positioning matters here.
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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