How far is O'Fallon, MO from Tarkio, MO?
The driving distance from O'Fallon, MO to Tarkio, MO is about 336.2 miles (541 km), with a travel time of about 06h 25m by car.
- The straight-line flight distance is about 273.2 miles (439.6 km).
- For a round trip, plan for roughly 12h 50m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 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 06h 25m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
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 Lafayette County, Missouri, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Driving Route Map
The map below follows the saved road route between O'Fallon and Tarkio.
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon and Tarkio.
-
1
Start on the route
8 m · 7 sec
-
2
Turn left onto South Main Street
3116 ft · 2 min · South Main Street
-
3
Turn left onto I 70 East
10 m · 6 sec
-
4
Turn sharp left onto South Main Street
87 m · 11 sec · South Main Street
-
5
Turn left onto West Terra Lane
576 ft · 12 sec · West Terra Lane
-
6
Take the ramp straight toward I 70 West
146 m · 7 sec
-
7
Merge slight left
200.7 mi · 3 hr 46 min
-
8
Continue on Truman/Eisenhower Presidential Highway
2.7 mi · 3 min · Truman/Eisenhower Presidential Highway
-
9
Continue on Clifton J. Scott Memorial Highway
1.8 mi · 2 min · Clifton J. Scott Memorial Highway
-
10
Continue on Truman/Eisenhower Presidential Highway
2.9 mi · 3 min · Truman/Eisenhower Presidential Highway
-
11
Continue on George Brett Super Highway
1.4 km · 58 sec · George Brett Super Highway
-
12
Take the exit slight right toward I 435 North, US 24 East: Des Moines
1.1 mi · 2 min
-
13
Merge slight left onto Lamar Hunt Memorial Highway
7.8 mi · 9 min · Lamar Hunt Memorial Highway
-
14
Continue on I435 N
1.3 mi · 1 min · I435 N
-
15
Continue straight
20.9 mi · 22 min
-
16
Keep slight left to continue on I 29 North, US 71 North: Saint Joseph
37.1 mi · 40 min
-
17
Continue straight
38 mi · 41 min
-
18
Take the exit slight right toward US 59: Craig, Fairfax
1577 ft · 29 sec
-
19
Turn left
12 mi · 18 min
-
20
Turn right onto US Highway 59
5.8 mi · 9 min · US Highway 59
-
21
Continue straight
1.4 mi · 2 min
-
22
Turn right onto Walnut Street
2617 ft · 50 sec · Walnut Street
-
23
Turn left onto South 3rd Street
998 ft · 46 sec · South 3rd Street
-
24
Turn right onto Main Street
48 m · 7 sec · Main Street
-
25
Arrive at your destination
0 m · 1 sec · Main Street
Car Route Details
A richer read on the saved driving route between O'Fallon and Tarkio.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 70 West
Merge slight left
201 mi · 03h 46m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Sunny leaving O'Fallon and Mostly Sunny near Tarkio.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from O'Fallon to Tarkio?
The road trip is about 336.2 miles (541 km) and usually takes 06h 25m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Aullville is a useful midpoint, sitting about 167.8 miles from O'Fallon and 168.3 miles from Tarkio.
How much longer is the road route than the straight-line distance?
The direct path is about 273.2 miles (439.6 km), while the road route adds roughly 63 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 7:30 AM CDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $44.72 one way or $89.45 round trip. Estimated CO2 is about 105.4 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around O'Fallon and Mostly Sunny near Tarkio.
Stop Ideas Near Aullville
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 Aullville.
Warrensburg
Sedalia
Lee's Summit
Independence
Flight Path Map
This map shows the direct air route between O'Fallon and Tarkio. Straight-line distance: 273.18 mi (439.64 km).
#1 O'Fallon
The most populous city in St.
| Population | 89,769 |
| Coordinates | 38.8106100, -90.6998500 |
| Altitude | 165 |
| Country | United States |
#2 Tarkio
City in Missouri
| Population | 1,420 |
| Coordinates | 40.4402800, -95.3777600 |
| Altitude | 283 |
| Country | United States |
End: Tarkio (-95.37776, 40.44028)
Estimated Travel Time
Distance: 541 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 12m |
| 40 mph (64.37 km/h) | 08h 24m |
| 50 mph (80.47 km/h) | 06h 43m |
| 60 mph (96.56 km/h) | 05h 36m |
| 70 mph (112.65 km/h) | 04h 48m |
| 80 mph (129 km/h) | 04h 11m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.77 | $44.72 | $89.45 |
| Mid-grade | $4.25 | $50.44 | $100.88 |
| Premium | $4.65 | $55.20 | $110.39 |
| Diesel | $5.30 | $62.91 | $125.81 |
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.