How far is St. Louis, MO from Saint Peters, MO?
The driving distance from St. Louis, MO to Saint Peters, MO is about 29.5 miles (47.5 km), with a travel time of about 00h 32m by car.
- The straight-line flight distance is about 26 miles (41.9 km).
- For a round trip, plan for roughly 01h 04m 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 32m.
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.
City in Saint Louis County, Missouri, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Slight Chance Rain Showers then Mostly Sunny
Driving Route Map
The map below follows the saved road route between St. Louis and Saint Peters.
Turn-by-Turn Driving Directions
Step-by-step road directions between St. Louis and Saint Peters.
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1
Start on Market Street
26 m · 6 sec · Market Street
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2
Turn right onto North Tucker Boulevard
1.3 km · 2 min · North Tucker Boulevard
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3
Turn left onto North 13th Street
1274 ft · 25 sec · North 13th Street
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4
Continue on North 13th Street
111 m · 6 sec · North 13th Street
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5
Continue on North Florissant Avenue
3.5 mi · 6 min · North Florissant Avenue
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6
Take the ramp slight left toward I 70 West
773 ft · 12 sec
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7
Merge slight left onto Mark Twain Expressway
23.7 mi · 30 min · Mark Twain Expressway
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8
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between St. Louis and Saint Peters.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Mark Twain Expressway
Merge slight left onto Mark Twain Expressway
23.7 mi · 00h 30m
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.
Mostly Sunny leaving St. Louis and Slight Chance Rain Showers then Mostly Sunny near Saint Peters.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from St. Louis to Saint Peters?
The road trip is about 29.5 miles (47.5 km) and usually takes 00h 32m 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?
Edmundson is a useful midpoint, sitting about 14.2 miles from St. Louis and 15.3 miles from Saint Peters.
How much longer is the road route than the straight-line distance?
The direct path is about 26 miles (41.9 km), while the road route adds roughly 3.5 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 7:26 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $3.92 one way or $7.84 round trip. Estimated CO2 is about 9.2 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around St. Louis and Slight Chance Rain Showers then Mostly Sunny near Saint Peters.
Stop Ideas Near Edmundson
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 Edmundson.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between St. Louis and Saint Peters. Straight-line distance: 26.02 mi (41.87 km).
#1 St. Louis
The second most populous city in Missouri and the center of the St.
| Population | 315,685 |
| Coordinates | 38.6272700, -90.1978900 |
| Altitude | 142 |
| 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: 48 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 59m |
| 40 mph (64.37 km/h) | 00h 44m |
| 50 mph (80.47 km/h) | 00h 35m |
| 60 mph (96.56 km/h) | 00h 29m |
| 70 mph (112.65 km/h) | 00h 25m |
| 80 mph (129 km/h) | 00h 22m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $3.92 | $7.84 |
| Mid-grade | $4.25 | $4.42 | $8.85 |
| Premium | $4.65 | $4.84 | $9.68 |
| Diesel | $5.30 | $5.52 | $11.03 |
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 02, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.