Origin
Eureka, MO
Late night in Eureka on Tuesday
Local time
4:09 AM
CDT
Current temp
70°F
Unavailable
Live forecast
Trip from Eureka, MO to O'Fallon, MO
Pin this tripCompiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 21, 2026 · Editorial standards
Drive Time
45m
Distance
26.1 mi
42 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$4
one way
EV Charging
Good
8 stations
Best Time to Leave
4 AM
0h 42m
★
6 AM
0h 46m
8 AM
0h 53m
10 AM
0h 48m
12 PM
0h 48m
3 PM
0h 49m
5 PM
0h 53m
8 PM
0h 43m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Eureka, MO
Wikimedia Commons
O'Fallon, MO
Wikimedia Commons
Trip Overview
If you are planning to travel between Eureka and O'Fallon, Missouri, you are looking at a straightforward 26.1-mile trip that typically takes about 42 minutes to complete. Because this journey is entirely local, it is easily manageable as a single-day excursion, requiring no overnight stays. You should budget approximately $4 for fuel to cover the distance, making it a very economical trip. Since both cities are located within the Midwest, you will remain in a familiar regional setting for the duration of your drive. This route is ideal for those who prefer quick, practical transit over long-haul highway travel.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| MO 109 | 10.9 mi | 18m |
| MO K | 6.3 mi | 11m |
| Avenue of the Saints | 3.1 mi | 3m |
| South Eatherton Road | 2.4 mi | 4m |
| Olive Street Road | 0.9 mi | 1m |
| Chesterfield Airport Road | 0.7 mi | 1m |
| South Main Street | 0.6 mi | 1m |
| North Outer Road | 0.5 mi | <1m |
Longest stretch:
MO 109
— 10.9 mi, about 18m
Turn-by-Turn Driving Directions
Step-by-step road directions between Eureka, MO and O'Fallon, MO.
1
Start on South Central Avenue
0.3 mi
·
1 min
·
South Central Avenue
2
Turn right onto East 5th Street
0.3 mi
·
31 sec
·
East 5th Street
3
Turn left onto MO 109
5.9 mi
·
10 min
·
MO 109
Use the left lane.
4
Enter roundabout onto MO 109
76 ft
·
1 sec
·
MO 109
5
Continue on MO 109
0.1 mi
·
13 sec
·
MO 109
6
Enter roundabout onto MO 109
90 ft
·
1 sec
·
MO 109
7
Continue on MO 109
515 ft
·
10 sec
·
MO 109
8
Enter roundabout onto MO 109
98 ft
·
1 sec
·
MO 109
9
Continue on MO 109
0.4 mi
·
45 sec
·
MO 109
10
Enter roundabout onto MO 109
94 ft
·
2 sec
·
MO 109
11
Continue on MO 109
4.3 mi
·
6 min
·
MO 109
12
Enter roundabout onto South Eatherton Road
94 ft
·
1 sec
·
South Eatherton Road
13
Continue on South Eatherton Road
2.4 mi
·
4 min
·
South Eatherton Road
14
Continue on Olive Street Road
0.9 mi
·
1 min
·
Olive Street Road
15
Take the ramp onto Chesterfield Airport Road
0.7 mi
·
1 min
·
Chesterfield Airport Road
16
Merge onto I 64; US 40; US 61
3.1 mi
·
3 min
·
Avenue of the Saints
Use the straight lane.
17
Take the exit
327 ft
·
6 sec
Exit 9
Toward MO K: O'Fallon
Use the straight / slight right lanes.
18
Merge onto North Outer Road
0.3 mi
·
31 sec
·
North Outer Road
19
Continue on North Outer Road
0.2 mi
·
17 sec
·
North Outer Road
20
Turn right onto MO K
3.3 mi
·
5 min
·
MO K
21
Continue on MO K
1.5 mi
·
2 min
·
MO K
Use the right lane.
22
Continue on MO K
1.6 mi
·
3 min
·
MO K
Use the right lane.
23
Continue on South Main Street
0.6 mi
·
1 min
·
South Main Street
24
Turn right
25 ft
·
1 sec
25
Arrive at destination
Heads-up: tricky spots
5 of 125 decision points cluster between mile 0.3 and 18.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
4
0.3 mi into trip
|
~1m in
|
East 5th Street
Turn right onto East 5th Street
Navigation decision point
5
6.6 mi into trip
|
~12m in
|
MO 109
Enter roundabout onto MO 109
Roundabout - know your exit number before entering
5
6.7 mi into trip
|
~12m in
|
MO 109
Enter roundabout onto MO 109
Roundabout - know your exit number before entering
5
15.5 mi into trip
|
~28m in
|
I 64; US 40; US 61 / Avenue of the Saints
Merge onto I 64; US 40; US 61 / Avenue of the Saints
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
7
18.6 mi into trip
|
~32m in
Take the exit toward MO K: O'Fallon
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the straight / slight right lanes.
Exit 9
Toward MO K: O'Fallon
Fuel & Cost
Regular Gas
$4.08 one way
$8.16 round trip
$3.97/gal
25.4 MPG avg
9 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $4.48 | $8.96 |
| premium | $4.89 | $5.02 | $10.05 |
| diesel | $5.61 | $5.76 | $11.53 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$4
Estimated CO2 emission: 9.1 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 7.8 | 0 | $2.74 | $1.25 |
| Efficient EV | 6.5 | 0 | $2.28 | $1.04 |
| EV Truck/SUV | 10.4 | 0 | $3.65 | $1.67 |
Gas CO2
9 kg
EV CO2
3 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Destination
O'Fallon, MO
Late night in O'Fallon on Tuesday
Local time
4:09 AM
CDT
Current temp
71°F
Unavailable
Live forecast
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
1 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
45m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
What kind of drive is this?
Expect a turn-heavy, local experience rather than a high-speed interstate cruise, as this route features zero percent highway travel. You will navigate your way using East 5th Street, South Eatherton Road, and other local connectors to reach your destination. Because the path relies on surface streets, the drive feels more like a tactical navigation through the local area than a monotonous highway slog. Be prepared for constant adjustments and turns, as the lack of sustained, uninterrupted stretches defines the character of this transit. It is a drive that demands your full attention to the road layout.
42% highway, the rest on surface roads — varied driving throughout.
25 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 10.9 mi on MO 109.
How Hard Is This Drive?
6/10
This route mixes highway mileage with some local-road sections near the start or finish. You will hit about 12 points where you need to pay attention to lane position or signs. The trickiest moment comes around 0.3 miles in near East 5th Street.
Driving Effort
6/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 26.1 miles you will encounter 12 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 0.3 miles (East 5th Street): Navigation decision point; at 6.6 miles (MO 109): Roundabout - know your exit number before entering; at 6.7 miles (MO 109): Roundabout - know your exit number before entering.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Eureka, MO to O'Fallon, MO, road signs begin pointing toward Mo K: O'fallon along the way.
Mo K: O'fallon
18.6 mi in
|
~32m
About the Cities
Arriving in O'Fallon, MO
Full guide →St. Charles, Missouri is outside of St. Louis on the bank of the Missouri River. It was Missouri's first state capital and was one of the first stops by Lewis and Clark on their journey to explore Louisiana Territory. The historic Main Street has largely been restored to its 1812-era appearance including gas lights a boardwalk and is lined with shops selling artwork, handicrafts, home decorations, antiques. There are also many restaurants.
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 45m. Total distance: 26.1 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
45m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (42%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 10.9 miles on MO 109. The full list of main roads is in the Roads section above.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at O'Fallon, MO before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Yes. At under 2 hours behind the wheel, this works well for families — plan one quick stop if you have younger kids.
The main spots that need attention: at 0.3 miles (East 5th Street): Navigation decision point; at 6.6 miles (MO 109): Roundabout - know your exit number before entering; at 6.7 miles (MO 109): Roundabout - know your exit number before entering.
Yes. A round trip is manageable in a single day if you plan a break at O'Fallon, MO before heading back.
How this page is built
Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
Was this helpful?
Thanks for your feedback!
Your tip has been submitted. Thanks!
/500
Recent Tips
·
Explore More
Continue From O'Fallon, MO
More trips to O'Fallon, MO
Explore more options from Eureka, MO or browse trips ending in O'Fallon, MO.
Looking for more statewide routes? Browse MO road trips.