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Trip from O'Fallon, MO to Washington County, MO

Last recalculated Apr 16, 2026

Drive Time

2h 17m

Distance

95.3 mi

153 km

Drive Score

8/10

Great drive

Same Day?

Yes, doable

Fuel Cost

$15

one way

EV Charging

Unknown

Best Time to Leave

Save up to 29 min
4 AM
2h 8m ★
6 AM
2h 18m
8 AM
2h 37m
10 AM
2h 25m
12 PM
2h 23m
3 PM
2h 26m
5 PM
2h 36m
8 PM
2h 12m

Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.

Best Time Drive vs Fly
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Downtown O'Fallon, MO, MO

O'Fallon, MO

Wikimedia Commons

Downtown Washington County, MO, MO

Washington County, MO

Townsend Walton

Trip Overview

The drive from O'Fallon, MO to Washington County, MO covers 95.3 miles and takes about 2h 17m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.

The route leans on MO 21, Veterans Memorial Highway, I 270 for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 29.7 miles on MO 21. At current regular gas prices, budget about $14.90 one way before food or hotel costs.

Trip Pace

Same-day drive is realistic

A same-day return is realistic if you keep stops short.

Midpoint

47.7 miles from O'Fallon, MO

A natural place for your longest stop of the day , about 1h 2m into the drive .

Who Is This Route For?

Weekend Trip

Doable as a same-day drive at 2h 17m. Total distance: 95.3 miles.

Family Friendly

Moderate complexity with 0 natural rest stops along the way.

Solo Traveler

2h 17m drive, comfortable solo distance.

First-Time Driver

Mostly highway driving (71%). Some complex stretches to watch for.

Drive Character

This is a 2h 17m highway drive covering 95.3 miles, with most of the trip on MO 21 and Veterans Memorial Highway. The longest continuous stretch is about 29.7 miles on MO 21.

Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 23 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
MO 21 is the longest continuous segment at about 29.7 miles.

How Hard Is This Drive?

This is a straightforward highway drive that stays mostly on MO 21 and Veterans Memorial Highway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 15.1 miles in.

Driving Effort 10/10

High effort - long or complex enough to need steady focus all day

Balances navigation complexity with total wheel time.

This is a demanding drive. With 18 significant decision points across 95.3 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.

Where does it get tricky?

The main spots that need attention: at 15.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 15.2 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 31.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.

Critical Maneuvers

5 of 18 key points

These are the spots where you need to pay the most attention. Preview them before you drive.

8
15.1 mi into trip | ~20m in

Take the exit toward I 270: Chicago, Memphis

Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one

Use the slight right lane. Exit 232 Toward I 270: Chicago, Memphis
7
15.2 mi into trip | ~20m in

Keep slight right at fork toward I 270 South: Memphis

Highway fork - watch signs carefully. Lane positioning matters here

Use the slight right lane. Toward I 270 South: Memphis
7
31.4 mi into trip | ~40m in

Take the exit toward MO 30: Gravois Road

Exit ramp - move to the correct lane early. Lane positioning matters here

Use the slight right lane. Exit 3 Toward MO 30: Gravois Road
8
31.7 mi into trip | ~41m in

Keep slight right at fork toward MO 30 West: Fenton

Highway fork - watch signs carefully. Lane positioning matters here

Use the right lane. Toward MO 30 West: Fenton
7
34.2 mi into trip | ~44m in

Take the exit toward MO 141: Fenton, Valley Park

Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one

Use the right lane. Toward MO 141: Fenton, Valley Park

Towns Mentioned on Route Signs

Based on OSRM destination-sign hints, not a full list of every settlement the road passes.

Between O'Fallon, MO and Washington County, MO, road signs point toward Memphis and Valley Park.

Memphis

15.1 mi in | ~20m

Valley Park

34.2 mi in | ~44m

Main Roads

Road Distance Duration
MO 21 29.7 mi 47m
Veterans Memorial Highway 19.8 mi 23m
I 270 15.6 mi 19m
I 70 13.5 mi 16m
MO 141 4 mi 5m
MO AA 3.8 mi 9m
MO 30 2.4 mi 3m
East High Street 1.5 mi 2m
Longest stretch: MO 21 — 29.7 mi, about 47m

Turn-by-Turn Driving Directions

Step-by-step road directions between O'Fallon, MO and Washington County, MO.

1

Start on this road

25 ft · 7 sec · this road
2

Turn left onto South Main Street

0.6 mi · 1 min · South Main Street
3

Turn left onto Drennen Parkway

0.9 mi · 1 min · Drennen Parkway
Use the left lane.
4

Take the ramp

438 ft · 6 sec
Toward I 70 East: Saint Louis Use the slight left lane.
5

Merge onto I 70

14 mi · 16 min · I 70
Use the straight / slight right lanes.
6

Take the exit

0.2 mi · 12 sec
Exit 232 Toward I 270: Chicago, Memphis Use the slight right lane.
7

Keep slight right at fork

0.4 mi · 33 sec
Toward I 270 South: Memphis Use the slight right lane.
8

Continue on this road

0.1 mi · 10 sec · this road
Exit 232 Toward I 270 South: Memphis
9

Merge onto I 270

16 mi · 19 min · I 270
Use the straight lane.
10

Take the exit

0.3 mi · 33 sec
Exit 3 Toward MO 30: Gravois Road Use the slight right lane.
11

Keep slight right at fork

306 ft · 7 sec
Toward MO 30 West: Fenton Use the right lane.
12

Merge onto MO 30

2.4 mi · 3 min · MO 30
13

Take the exit

0.2 mi · 27 sec
Toward MO 141: Fenton, Valley Park Use the right lane.
14

Turn left onto MO 141

4.0 mi · 5 min · MO 141
Use the left / straight lanes.
15

Take the exit

0.2 mi · 13 sec
Toward MO 21 South: Hillsboro
16

Merge onto MO 21

20 mi · 23 min · Veterans Memorial Highway
17

At end of road, turn left onto MO 21; MO B

0.5 mi · 49 sec · MO 21; MO B
18

Continue on MO 21

29 mi · 46 min · MO 21
Use the straight lane.
19

Turn right onto MO 8

1.5 mi · 2 min · East High Street
20

Turn straight onto MO 185

1.4 mi · 2 min · MO 185
21

Turn left onto MO AA

3.8 mi · 9 min · MO AA
22

Turn left

0.5 mi · 2 min
23

Arrive at destination

Trip Plan

Morning Departure

Leave by 9 AM and you'll arrive before lunch.

Evening Departure

Even a 4 PM departure gets you there before dark in summer.

You can normally do this drive in one day.
You may only need one short stretch break if traffic stays light.
The halfway point lands around 47.7 miles from O'Fallon, MO, or about 1h 2m into the drive.
The longest continuous stretch on this route runs about 29.7 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 21 miles or 27m in

Use this first pause for coffee, a restroom break, and a quick traffic check ahead.

Halfway reset

Around 47.7 miles or 1h 2m in

This is the best place for your longest stop, a real meal, and a full fuel check.

Final approach

Final hour starts around 1h 46m

Traffic, exits, and arrival timing usually matter more near Washington County, 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 95.3 miles and 2h 17m.

Your first comfortable stop window is around 21 miles from O'Fallon, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
The longest stretch is on MO 21 for about 29.7 miles.

Where to Stop

Rest stops, refuel points, and overnight suggestions along this route.

Halfway Point

Midpoint

About 47.7 mi from O'Fallon, MO · 1h 2m into the drive

Downtown Byrnes Mill, MO, MO

Mid-route town

Meal stop

Byrnes Mill, MO

48 mi into the route

Best for: Lunch, fuel, and a longer reset

This sits close to the middle of the route, so it works well for the longest stop of the day.

Pacing Suggestions

Kirkwood, MO

Fuel and coffee

A short stop after about 21 miles helps settle the day before fatigue starts building.

Byrnes Mill, MO

Meal break

The midpoint is around 47.7 miles from O'Fallon, MO, which is a good place for a longer meal and fuel stop.

Arriving in Washington County, MO

The final approach into Washington County, MO usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.

Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Washington County, MO.

These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.

National Parks Near This Route

Worth a detour if your schedule allows.

Gateway Arch National Park

Gateway Arch National Park

National Park

Gateway Arch National Park commemorates President Jefferson’s vision of a continental nation, the individuals and cultural groups who helped shape its history, St. Louis’ role in westward expansion, a...

14 mi from route ~35 min detour $19 near mile 29.6
View on nps.gov

Park data from the National Park Service API. Alerts update every 2 hours.

Fuel & Cost

Regular Gas

$14.90 one way

$29.80 round trip

$3.97/gal 25.4 MPG avg 33 kg CO2
Fuel Type $/gal One Way Round Trip
midgrade $4.36 $16.36 $32.72
premium $4.89 $18.34 $36.68
diesel $5.61 $21.04 $42.08

No toll roads detected on this route.

Estimated Trip Cost (one way, 1 person)

Fuel

$15

Meals

$25–$50

Total

$40–$65

Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.

Estimated CO2 emission: 33.3 kg one way. Prices: EIA weekly data, 2026-04-13.

Driving Electric?

About $10 in charging · 0 stops · 67% less CO2

Vehicle Type kWh Stops DC Fast Home Charge
Average EV 28.6 0 $10.01 $4.57
Efficient EV 23.8 0 $8.34 $3.81
EV Truck/SUV 38.1 0 $13.34 $6.10

Gas CO2

33 kg

EV CO2

11 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.

Forecast as of Apr 15, 2026

Origin

O'Fallon, MO

Evening in O'Fallon on Thursday

Local time

5:20 PM

CDT

Current temp

57°F

Unavailable

Live forecast

Destination

Washington County, MO

Evening in Washington County on Thursday

Local time

5:20 PM

CDT

Current temp

80°F

Unavailable

Live forecast

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

23 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

2h 17m 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.

Frequently Asked Questions

The drive from O'Fallon, MO to Washington County, MO covers 95.3 miles and takes about 2h 17m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are MO 21, Veterans Memorial Highway, I 270. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 47.7 miles from O'Fallon, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $14.90 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.
This is a demanding drive. With 18 significant decision points across 95.3 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
The main spots that need attention: at 15.1 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 15.2 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 31.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Between O'Fallon, MO and Washington County, MO, road signs point toward Memphis and Valley Park.
Yes. Nearby national parks include Gateway Arch National Park.

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Explore More

Return Trip

Washington County, MO to O'Fallon, MO

Plan the drive back the other way.

95.5 mi 2h 17m

Continue From Washington County, MO

Lee's Summit, MO 244.6 mi · 5h 27m Jefferson City, MO 117.6 mi · 2h 49m

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