How far is Unionville, MO from Saint Peters, MO?
The driving distance from Unionville, MO to Saint Peters, MO is about 224.4 miles (361.1 km), with a travel time of about 03h 38m by car.
- The straight-line flight distance is about 171.5 miles (276 km).
- For a round trip, plan for roughly 07h 16m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM CDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 03h 38m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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 Shelby County, Missouri
Route Weather Snapshot
Check the forecast at both ends before you head out.
Showers And Thunderstorms
Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Unionville and Saint Peters.
Turn-by-Turn Driving Directions
Step-by-step road directions between Unionville and Saint Peters.
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1
Start on Main Street
24.5 mi · 36 min · Main Street
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2
At the end of the road, turn right
54.5 mi · 1 hr 5 min
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3
Take the exit left toward US 36 East, MO 110 East: Hannibal
929 ft · 12 sec
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4
Merge slight left onto Chicago-Kansas City Expressway
52.9 mi · 1 hr 1 min · Chicago-Kansas City Expressway
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5
Continue on V.F.W. Memorial Highway
5.8 mi · 7 min · V.F.W. Memorial Highway
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6
Take the exit slight right toward Veterans Road
1167 ft · 30 sec
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7
Turn right onto Veterans Road
2.1 mi · 4 min · Veterans Road
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8
At the end of the road, turn left onto County Road 422
85 m · 7 sec · County Road 422
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9
Continue on Paris Gravel Road
2539 ft · 1 min · Paris Gravel Road
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10
Take the ramp right
37 m · 3 sec
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11
Merge slight left onto Avenue of the Saints
73.7 mi · 1 hr 27 min · Avenue of the Saints
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12
Take the exit slight left toward I 70 East: Saint Louis
2705 ft · 51 sec
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13
Merge slight left onto Dwight D Eisenhower Highway
10.9 mi · 13 min · Dwight D Eisenhower Highway
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14
Take the exit slight right toward Mid Rivers Mall Drive
889 ft · 19 sec
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15
Keep slight left to continue on Mid Rivers Mall Drive
63 m · 4 sec
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16
Turn straight onto Mid Rivers Mall Drive
61 m · 6 sec · Mid Rivers Mall Drive
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17
Take the ramp straight toward I 70 West: Wentzville
1419 ft · 20 sec
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18
Merge slight left
146 m · 7 sec
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19
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Unionville and Saint Peters.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Avenue of the Saints
Merge slight left onto Avenue of the Saints
73.7 mi · 01h 27m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Showers And Thunderstorms leaving Unionville and 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 Unionville to Saint Peters?
The road trip is about 224.4 miles (361.1 km) and usually takes 03h 38m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Hunnewell is a useful midpoint, sitting about 113.2 miles from Unionville and 111.2 miles from Saint Peters.
How much longer is the road route than the straight-line distance?
The direct path is about 171.5 miles (276 km), while the road route adds roughly 52.9 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 6:00 AM to 8:00 AM CDT. If you want a more comfortable same-day return, try to leave by 9:44 AM CDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $29.87 one way or $59.73 round trip. Estimated CO2 is about 70.4 kg one way.
What should you check before leaving?
Before you leave, expect Showers And Thunderstorms around Unionville and Showers And Thunderstorms near Saint Peters.
Stop Ideas Near Hunnewell
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 Hunnewell.
Quincy
La Plata
Hermann
Fort Madison station
Flight Path Map
This map shows the direct air route between Unionville and Saint Peters. Straight-line distance: 171.49 mi (275.98 km).
#1 Unionville
City in Putnam County, Missouri, United States
| Population | 1,733 |
| Coordinates | 40.4769600, -93.0032600 |
| Altitude | 324 |
| 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: 361 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 28m |
| 40 mph (64.37 km/h) | 05h 36m |
| 50 mph (80.47 km/h) | 04h 29m |
| 60 mph (96.56 km/h) | 03h 44m |
| 70 mph (112.65 km/h) | 03h 12m |
| 80 mph (129 km/h) | 02h 47m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $29.87 | $59.73 |
| Mid-grade | $4.25 | $33.68 | $67.37 |
| Premium | $4.65 | $36.86 | $73.72 |
| Diesel | $5.30 | $42.01 | $84.02 |
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 · Apr 24, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.