O'Fallon, MO to Savannah, MO is 284.1 miles and takes about 5h 23m via I 70 and I 29, with a fuel budget near $50 and enough daylight to finish in a day. This trip stays within the Midwest, traversing Missouri for its entirety. With 93% of the drive on highways, expect a straightforward and efficient transit. This route is best suited for those looking to cover ground quickly between these two points, with minimal fuss. Consider this a practical option for a single-day drive.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
142 miles from O'Fallon, MO
A natural place for your longest stop of the day
, about 2h 41m into the drive
.
Main Roads
Road
Distance
Duration
I 70
200.7 mi
3h 46m
I 29
36.7 mi
39m
I 435
20.9 mi
22m
Lamar Hunt Memorial Highway
7.8 mi
9m
US 71 Business
5.7 mi
7m
Truman/Eisenhower Presidential Highway
5.6 mi
6m
Clifton J. Scott Memorial Highway
1.8 mi
2m
I435 N
1.3 mi
1m
Longest stretch:
I 70
— 200.7 mi, about 3h 46m
Traffic on I-70
Hour-of-day weekday pattern from 27 FHWA count stations on your route.
Peak
4 PM
~2,893 veh/hr typical
· worst 3,398
Quietest
1 AM
~270 veh/hr
Peak-to-quiet ratio
10.7×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon, MO and Savannah, MO.
Exit 8BToward I 435 North, US 24 East: Des MoinesUse the straight / slight right lanes.
13
Merge onto I 435; US 24
7.8 mi·9 min·Lamar Hunt Memorial Highway
14
Continue on I435 N
1.3 mi·1 min·I435 N
15
Continue on I 435
21 mi·22 min·I 435
16
Keep slight left at fork onto I 29; US 71
37 mi·39 min·I 29; US 71
Toward I 29 North, US 71 North: Saint Joseph
17
Take the exit
0.3 mi·23 sec
Exit 53Toward I 29 Business, US 59 South, US 71 Business: Savannah
18
Turn right onto US 71 Business
5.7 mi·7 min·US 71 Business
19
Turn left onto East Price Street
0.5 mi·1 min·East Price Street
20
Turn right onto South 5th Street
0.2 mi·36 sec·South 5th Street
21
Arrive at destination
North 5th Street
Trip Plan
Given the 5 hour 23 minute estimated drive time, starting in the morning from O'Fallon should allow you to reach Savannah with plenty of daylight. Since it's a single-day trip primarily on the interstate, you have flexibility with stops. The $50 fuel cost estimate suggests one or two fill-ups will likely suffice, but check your vehicle's MPG. Keep an eye out for the transition onto I 29 from I 70, as this marks a significant change in direction for the latter half of your drive. Plan your final fuel stop before reaching the more rural stretches if needed.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 142 miles from O'Fallon, MO, or about 2h 41m into the drive.
The longest continuous stretch on this route runs about 200.7 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 63 miles or 1h 12m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 142 miles or 2h 41m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 24m
Traffic, exits, and arrival timing usually matter more near Savannah, MO than in the middle of the route.
Before You Leave
+
Open the route before leaving O'Fallon, MO so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from O'Fallon, MO
This is one driving day of about 284.1 miles and 5h 23m.
Your first comfortable stop window is around 63 miles from O'Fallon, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on I 70 for about 200.7 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 13
5 decision points cluster between mile 0.6 and 240.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
0.6 mi into trip|~1m in
Turn left toward I 70 East
Lane positioning matters here
Use the left lane.
Toward I 70 East
6
0.6 mi into trip|~1m in|South Main Street
Turn sharp left onto South Main Street
Sharp turn - reduce speed on approach
6
0.7 mi into trip|~2m in|West Terra Lane
Turn left onto West Terra Lane
Lane positioning matters here
Use the left lane.
8
209.7 mi into trip|~3h 57m in
Take the exit toward I 435 North, US 24 East: Des Moines
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 8B
Toward I 435 North, US 24 East: Des Moines
6
240.8 mi into trip|~4h 33m in|I 29; US 71
Keep slight left at fork onto I 29; US 71 toward I 29 North, US 71 North: Saint Joseph
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward I 29 North, US 71 North: Saint Joseph
Fuel & Cost
Regular Gas
$41.96 one way
$83.91 round trip
$3.75/gal25.4 MPG avg99 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.14
$46.32
$92.63
premium
$4.72
$52.75
$105.50
diesel
$4.80
$53.64
$107.29
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$42
Meals
$25–$50
Total
$67–$92
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 99.4 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $30 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
85.2
1
$29.83
$13.64
Efficient EV
71
0
$24.86
$11.36
EV Truck/SUV
113.6
1
$39.77
$18.18
Gas CO2
99 kg
EV CO2
33 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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.
Forecast as of Jul 18, 2026
Origin
O'Fallon, MO
Late night
in O'Fallon on Sunday
Local time
4:55 AM
CDT
Current temp
75°F
Clear
SW 6 mph2% chanceLive forecast
Heat Advisory
Heat Advisory issued July 17 at 12:32PM CDT until July 18 at 7:00PM CDT by NWS Quad Cities IA IL
Heat Advisory
Heat Advisory issued July 17 at 11:01AM CDT until July 21 at 7:00PM CDT by NWS St Louis MO
Destination
Savannah, MO
Late night
in Savannah on Sunday
Local time
4:55 AM
CDT
Current temp
73°F
Mostly Clear
SSW 9 mph3% chanceLive forecast
Heat Advisory
Heat Advisory issued July 17 at 12:32PM CDT until July 18 at 7:00PM CDT by NWS Quad Cities IA IL
Heat Advisory
Heat Advisory issued July 17 at 11:01AM CDT until July 21 at 7:00PM CDT by NWS St Louis MO
92°F
Marshall, MO
142 mi in
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
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
2 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
5h 23m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
This route is predominantly highway, with 93% of the 284.1 miles spent on major interstates like I 70 and I 29. You'll encounter your longest continuous stretch on I 70 for 200.7 miles before transitioning. The final portion of your drive will involve navigating I 435, which can mean more frequent exits and merging traffic as you approach your destination. Expect a fairly consistent driving experience for the majority of the trip.
93% highway — fuel and pacing are the main things to plan.
21 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 200.7 mi on I 70.
How Hard Is This Drive?
5/10
This is a straightforward highway drive that stays mostly on I 70 and I 29. You will hit about 13 points where you need to pay attention to lane position or signs. The trickiest moment comes around 0.6 miles in.
Driving Effort5/10
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 284.1 miles you will encounter 13 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 0.6 miles: Lane positioning matters here; at 0.6 miles (South Main Street): Sharp turn - reduce speed on approach; at 0.7 miles (West Terra Lane): Lane positioning matters here.
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.
Doable as a same-day drive at 5h 23m. Total distance: 284.1 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 23m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (93%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 200.7 miles on I 70. The full list of main roads is in the Roads section above.
Yes — we found about 40 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 40 rest areas along the route for bathroom stops.
The main spots that need attention: at 0.6 miles: Lane positioning matters here; at 0.6 miles (South Main Street): Sharp turn - reduce speed on approach; at 0.7 miles (West Terra Lane): Lane positioning matters here.
Not recommended in a single day. At 5.4 hours each way, a round trip means 10.8 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Savannah, MO before the return drive.
