Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
55m
Distance
43.8 mi
70 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$7
one way
EV Charging
Unknown
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Barnhart, MO
Wikimedia Commons
Saint Peters, MO
Wikimedia Commons
The drive from Barnhart, MO to Saint Peters, MO covers 43.8 miles and takes about 55m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on I 270, I 70, I 55 for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 18.1 miles on I 270. At current regular gas prices, budget about $6.85 one way before food or hotel costs.
Weekend Trip
Doable as a same-day drive at 55m. Total distance: 43.8 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
55m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (88%). Some complex stretches to watch for.
This is a 55m highway drive covering 43.8 miles, with most of the trip on I 270 and I 70. The longest continuous stretch is about 18.1 miles on I 270.
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 12.2 miles in.
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 12 decision points packed into just 43.8 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 55m.
Where does it get tricky?
The main spots that need attention: at 12.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 12.5 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 13.3 miles (I 270): Merge point - match speed before joining. Lane positioning matters here.
These are the spots where you need to pay the most attention. Preview them before you drive.
Take the exit toward I 270 West, I 255 East: Kansas City, Chicago
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Keep slight left at fork toward I 270 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Merge onto I 270
Merge point - match speed before joining. Lane positioning matters here
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
Keep slight left at fork toward I 70 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Barnhart, MO and Saint Peters, MO, road signs point toward Chicago, Saint Louis and Saint Louis Lambert International Airport.
Chicago
Saint Louis
Saint Louis Lambert International Airport
| Road | Distance | Duration |
|---|---|---|
| I 270 | 18.1 mi | 22m |
| I 70 | 10.5 mi | 13m |
| I 55 | 9.6 mi | 10m |
| Rosa Parks Highway | 1.3 mi | 1m |
| MO M | 0.6 mi | 1m |
| East Street | 0.2 mi | <1m |
| US 61 | 0.2 mi | <1m |
| Willing Street | <0.1 mi | <1m |
Step-by-step road directions between Barnhart, MO and Saint Peters, MO.
Start on East Street
Turn right onto Willing Street
Turn left onto East Street
Turn left onto US 61; US 67
Turn left onto MO M
Take the ramp
Merge onto I 55
Continue on I 55
Take the exit
Keep slight left at fork
Continue on this road
Merge onto I 270
Take the exit
Keep slight left at fork
Continue on this road
Merge onto I 70
Arrive at destination
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 21.9 mi from Barnhart, MO · 27m into the drive
Mid-route town
Meal stop
22 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.
A short stop after about 10 miles helps settle the day before fatigue starts building.
The midpoint is around 21.9 miles from Barnhart, MO, which is a good place for a longer meal and fuel stop.
Allow a few extra minutes for the final approach into Saint Peters, MO if you are unfamiliar with the area.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Regular Gas
$6.85 one way
$13.70 round trip
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $7.52 | $15.04 |
| premium | $4.89 | $8.43 | $16.86 |
| diesel | $5.61 | $9.67 | $19.34 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$7
Estimated CO2 emission: 15.3 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $5 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 13.1 | 0 | $4.60 | $2.10 |
| Efficient EV | 11 | 0 | $3.83 | $1.75 |
| EV Truck/SUV | 17.5 | 0 | $6.13 | $2.80 |
Gas CO2
15 kg
EV CO2
5 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.
Current conditions at both ends of the drive.
Origin
Evening in Barnhart on Friday
Local time
8:41 PM
CDT
Current temp
59°F
Mostly Clear
Destination
Evening in Saint Peters on Friday
Local time
8:41 PM
CDT
Current temp
57°F
Unavailable
Time zone
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
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.
Compiled by the Trip.ovh 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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