Origin
Mehlville, MO
Night in Mehlville on Saturday
Local time
11:43 PM
CDT
Current temp
57°F
Unavailable
Live forecast
Trip from Mehlville, 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
41m
Distance
32.2 mi
52 km
Drive Score
5/10
Practical drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 38m
★
6 AM
0h 41m
8 AM
0h 48m
10 AM
0h 44m
12 PM
0h 43m
3 PM
0h 44m
5 PM
0h 48m
8 PM
0h 39m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Mehlville, MO
Mikhail Nilov
Saint Peters, MO
Wikimedia Commons
Trip Overview
Mehlville, MO to Saint Peters, MO is 32.2 miles and takes about 41m via I 270, I 70, and I 255, with a fuel budget near $5 and enough daylight to finish in a day. This is a straightforward, highway-focused drive primarily within Missouri, connecting two points in the Midwest region. Given its short distance and focus on interstate travel, it's an ideal option for a quick trip or a segment of a larger journey. You'll be on major highways for almost the entire 93% of the drive, so expect efficient travel without many detours.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 270 | 18.7 mi | 23m |
| I 70 | 10.5 mi | 13m |
| I 255 | 0.6 mi | <1m |
| Lemay Ferry Road | 0.4 mi | <1m |
Longest stretch:
I 270
— 18.7 mi, about 23m
Turn-by-Turn Driving Directions
Step-by-step road directions between Mehlville, MO and Saint Peters, MO.
1
Start on MO 267
0.4 mi
·
56 sec
·
Lemay Ferry Road
2
Take the ramp
0.2 mi
·
32 sec
Toward I 270 West
Use the left lane.
3
Merge onto I 255
0.6 mi
·
43 sec
·
I 255
Use the straight lane.
4
Continue on I 270
19 mi
·
23 min
·
I 270
Use the straight lane.
5
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.
6
Keep slight left at fork
0.1 mi
·
11 sec
Toward I 70 West: Kansas City
Use the slight left lane.
7
Continue on this road
0.6 mi
·
57 sec
·
this road
Exit 20B
Toward I 70 West: Kansas City
8
Merge onto I 70
11 mi
·
13 min
·
I 70
Use the straight / slight right lanes.
9
Arrive at destination
I 70
Heads-up: tricky spots
5 of 55 decision points cluster between mile 0.4 and 21.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
0.4 mi into trip
|
~0m in
Take the ramp toward I 270 West
Lane positioning matters here
Use the left lane.
Toward I 270 West
5
0.6 mi into trip
|
~1m in
|
I 255
Merge onto I 255
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
8
19.9 mi into trip
|
~25m 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
20.9 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
5
21.7 mi into trip
|
~28m in
|
I 70
Merge onto I 70
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
Fuel & Cost
Regular Gas
$5.03 one way
$10.07 round trip
$3.97/gal
25.4 MPG avg
11 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $5.53 | $11.05 |
| premium | $4.89 | $6.20 | $12.39 |
| diesel | $5.61 | $7.11 | $14.22 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 11.3 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 | 9.7 | 0 | $3.38 | $1.55 |
| Efficient EV | 8.1 | 0 | $2.82 | $1.29 |
| EV Truck/SUV | 12.9 | 0 | $4.51 | $2.06 |
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
11:43 PM
CDT
Current temp
60°F
Partly Cloudy
S 5 mph
1% chance
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
3 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
41m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
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 a classic highway-focused drive, with 93% of the journey on interstates. You'll experience a consistent pace for much of the trip, particularly during the longest stretch of 18.7 miles on I 270. The character is largely defined by these major roadways, offering a direct path between Mehlville and Saint Peters. While the scenery might be typical of interstate corridors, the efficiency of the chosen highways makes for a predictable and swift commute.
93% highway — fuel and pacing are the main things to plan.
9 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 18.7 mi on I 270.
How Hard Is This Drive?
6/10
This is a straightforward highway drive that stays mostly on I 270 and I 70. You will hit about 5 points where you need to pay attention to lane position or signs. The trickiest moment comes around 0.4 miles in.
Driving Effort
6/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 32.2 miles you will encounter 5 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 0.4 miles: Lane positioning matters here; at 0.6 miles (I 255): Merge point - match speed before joining. Lane positioning matters here; at 19.9 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.
Between Mehlville, MO and Saint Peters, MO, road signs point toward Saint Louis and Saint Louis Lambert International Airport.
Saint Louis
19.9 mi in
|
~25m
Saint Louis Lambert International Airport
19.9 mi in
|
~25m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 41m. Total distance: 32.2 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
41m 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 18.7 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 0.4 miles: Lane positioning matters here; at 0.6 miles (I 255): Merge point - match speed before joining. Lane positioning matters here; at 19.9 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
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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