How far is Arnold, MO from Saint Peters, MO?
The driving distance from Arnold, MO to Saint Peters, MO is about 37 miles (59.6 km), with a travel time of about 00h 37m by car.
- The straight-line flight distance is about 28.7 miles (46.2 km).
- For a round trip, plan for roughly 01h 14m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM CDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 00h 37m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Village in west St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Arnold and Saint Peters.
Turn-by-Turn Driving Directions
Step-by-step road directions between Arnold and Saint Peters.
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1
Start on Jeffco Boulevard
1.4 km · 2 min · Jeffco Boulevard
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2
Turn left
1283 ft · 28 sec
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3
Take the ramp slight right toward I 55 North
1225 ft · 31 sec
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4
Merge slight left onto Police Officer Steven Jarvis Memorial Highway
1.4 km · 1 min · Police Officer Steven Jarvis Memorial Highway
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5
Continue on Officer Thomas G. Smith, Jr. Memorial Highway
1.9 mi · 2 min · Officer Thomas G. Smith, Jr. Memorial Highway
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6
Continue on Rosa Parks Highway
1.3 mi · 2 min · Rosa Parks Highway
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7
Take the exit slight right toward I 270 West, I 255 East: Kansas City, Chicago
1279 ft · 27 sec
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8
Keep slight left to continue on I 270 West: Kansas City
118 m · 8 sec
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9
Continue on I 270 West
1.2 km · 1 min
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10
Merge slight left
18.1 mi · 23 min
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11
Take the exit slight right toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
1 mi · 1 min
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12
Keep slight left to continue on I 70 West: Kansas City
645 ft · 11 sec
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13
Continue on I 70 West: Kansas City
1 km · 57 sec
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14
Merge slight left
10.5 mi · 13 min
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15
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Arnold and Saint Peters.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 270 West
Merge slight left
18.1 mi · 00h 23m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Sunny leaving Arnold and Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms near Saint Peters.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Arnold to Saint Peters?
The road trip is about 37 miles (59.6 km) and usually takes 00h 37m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Westwood is a useful midpoint, sitting about 18.5 miles from Arnold and 18.5 miles from Saint Peters.
How much longer is the road route than the straight-line distance?
The direct path is about 28.7 miles (46.2 km), while the road route adds roughly 8.3 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 7:00 AM to 7:00 PM CDT. If you want a more comfortable same-day return, try to leave by 7:16 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $4.94 one way or $9.88 round trip. Estimated CO2 is about 11.6 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Arnold and Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms near Saint Peters.
Stop Ideas Near Westwood
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Westwood.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between Arnold and Saint Peters. Straight-line distance: 28.73 mi (46.23 km).
#1 Arnold
City in Missouri
| Population | 21,145 |
| Coordinates | 38.4328300, -90.3776200 |
| Altitude | 184 |
| Country | United States |
#2 Saint Peters
The most populous city in St.
| Population | 58,043 |
| Coordinates | 38.8003300, -90.6265100 |
| Altitude | 134 |
| Country | United States |
End: I 70 West (-90.626511, 38.800311)
Estimated Travel Time
Distance: 60 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 14m |
| 40 mph (64.37 km/h) | 00h 55m |
| 50 mph (80.47 km/h) | 00h 44m |
| 60 mph (96.56 km/h) | 00h 37m |
| 70 mph (112.65 km/h) | 00h 31m |
| 80 mph (129 km/h) | 00h 27m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $4.94 | $9.88 |
| Mid-grade | $4.25 | $5.57 | $11.14 |
| Premium | $4.65 | $6.10 | $12.19 |
| Diesel | $5.30 | $6.95 | $13.90 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Missouri · May 13, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.