How far is Arnold, MO from St. Louis, MO?
The driving distance from Arnold, MO to St. Louis, MO is about 18.4 miles (29.6 km), with a travel time of about 00h 23m by car.
- The straight-line flight distance is about 16.6 miles (26.7 km).
- For a round trip, plan for roughly 00h 46m 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 23m.
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.
Human settlement in St.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Arnold and St. Louis.
Turn-by-Turn Driving Directions
Step-by-step road directions between Arnold and St. Louis.
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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
12.5 mi · 16 min · Rosa Parks Highway
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7
Take the exit slight right toward MO 30 East: Gravois Avenue
1001 ft · 24 sec
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8
Turn slight right onto Gravois Avenue
1044 ft · 27 sec · Gravois Avenue
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9
Continue on South Tucker Boulevard
1.3 mi · 3 min · South Tucker Boulevard
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10
Turn right onto Market Street
26 m · 2 sec · Market Street
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11
Arrive at your destination
0 m · 1 sec · Market Street
Car Route Details
A richer read on the saved driving route between Arnold and St. Louis.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
Rosa Parks Highway
Continue on Rosa Parks Highway
12.5 mi · 00h 16m
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 Sunny near St. Louis.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Arnold to St. Louis?
The road trip is about 18.4 miles (29.6 km) and usually takes 00h 23m 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?
Wilbur Park is a useful midpoint, sitting about 9.2 miles from Arnold and 9.2 miles from St. Louis.
How much longer is the road route than the straight-line distance?
The direct path is about 16.6 miles (26.7 km), while the road route adds roughly 1.8 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 7:44 PM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.45 one way or $4.90 round trip. Estimated CO2 is about 5.8 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Arnold and Sunny near St. Louis.
Stop Ideas Near Wilbur Park
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 Wilbur Park.
Kirkwood
Gateway Transportation Center
Alton
Washington
Flight Path Map
This map shows the direct air route between Arnold and St. Louis. Straight-line distance: 16.58 mi (26.68 km).
#1 Arnold
City in Missouri
| Population | 21,145 |
| Coordinates | 38.4328300, -90.3776200 |
| Altitude | 184 |
| Country | United States |
#2 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 |
End: Market Street (-90.197859, 38.627348)
Estimated Travel Time
Distance: 30 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 36m |
| 40 mph (64.37 km/h) | 00h 27m |
| 50 mph (80.47 km/h) | 00h 22m |
| 60 mph (96.56 km/h) | 00h 18m |
| 70 mph (112.65 km/h) | 00h 15m |
| 80 mph (129 km/h) | 00h 13m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $2.45 | $4.90 |
| Mid-grade | $4.25 | $2.76 | $5.53 |
| Premium | $4.65 | $3.03 | $6.05 |
| Diesel | $5.30 | $3.45 | $6.90 |
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.