Origin
Brentwood, MO
Morning in Brentwood on Saturday
Local time
7:39 AM
CDT
Current temp
78°F
Unavailable
Live forecast
Trip from Brentwood, MO to O'Fallon, MO
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
40m
Distance
29.8 mi
48 km
Drive Score
7/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Good
6 stations
Best Time to Leave
4 AM
0h 37m
★
6 AM
0h 40m
8 AM
0h 47m
10 AM
0h 43m
12 PM
0h 42m
3 PM
0h 43m
5 PM
0h 47m
8 PM
0h 38m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Brentwood, MO
Valeria Boltneva
O'Fallon, MO
Wikimedia Commons
Trip Overview
The drive from Brentwood, MO to O'Fallon, MO covers 29.8 miles and takes about 40m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on I 70, I 270, Daniel Boone Expressway for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 13.6 miles on I 70. At current regular gas prices, budget about $4.66 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 40m. Total distance: 29.8 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
40m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (77%). Some complex stretches to watch for.
Drive Character
This is a 40m highway drive covering 29.8 miles, with most of the trip on I 70 and I 270. The longest continuous stretch is about 13.6 miles on I 70.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 19 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 70 is the longest continuous segment at about 13.6 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 70 and I 270. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 1 miles in.
Driving Effort
10/10
Focused - lots of decisions in a short distance, but it is over quickly
Balances navigation complexity with total wheel time.
This is a short but busy drive. With 15 decision points packed into just 29.8 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 40m.
Where does it get tricky?
The main spots that need attention: at 1 miles: Lane positioning matters here. Multiple destination signs - pick the right one; at 6.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 6.6 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Critical Maneuvers
5 of 15 key pointsThese are the spots where you need to pay the most attention. Preview them before you drive.
7
1 mi into trip
|
~2m in
Take the ramp toward I 64 West, US 40 West
Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / left lanes.
Toward I 64 West, US 40 West
8
6.5 mi into trip
|
~9m in
Take the exit toward I 270: Memphis, Chicago
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 25
Toward I 270: Memphis, Chicago
8
6.6 mi into trip
|
~9m in
Keep slight right at fork toward I 270 North: Chicago
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Toward I 270 North: Chicago
8
12.9 mi into trip
|
~17m in
Take the exit toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
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 20A
Toward I 70: Kansas City, Saint Louis, Saint Lo...
8
28.3 mi into trip
|
~37m in
Take the exit toward MO K: O'Fallon, Main Street
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 218
Toward MO K: O'Fallon, Main Street
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Brentwood, MO and O'Fallon, MO, road signs point toward Chicago, Saint Louis, Saint Louis Lambert International Airport and Mo K: O'fallon.
Chicago
6.5 mi in
|
~9m
Saint Louis
12.9 mi in
|
~17m
Saint Louis Lambert International Airport
12.9 mi in
|
~17m
Mo K: O'fallon
28.3 mi in
|
~37m
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 70 | 13.6 mi | 16m |
| I 270 | 6.1 mi | 7m |
| Daniel Boone Expressway | 3.4 mi | 4m |
| Avenue of the Saints | 1.8 mi | 2m |
| East Terra Lane | 0.9 mi | 1m |
| South Brentwood Boulevard | 0.9 mi | 2m |
| South Main Street | 0.5 mi | 1m |
| Litzsinger Road | <0.1 mi | <1m |
Longest stretch:
I 70
— 13.6 mi, about 16m
Turn-by-Turn Driving Directions
Step-by-step road directions between Brentwood, MO and O'Fallon, MO.
1
Start on this road
68 ft
·
6 sec
·
this road
2
Turn right
59 ft
·
6 sec
3
Turn right onto Litzsinger Road
300 ft
·
12 sec
·
Litzsinger Road
4
Turn left onto South Brentwood Boulevard
0.9 mi
·
2 min
·
South Brentwood Boulevard
5
Take the ramp
0.3 mi
·
26 sec
Toward I 64 West, US 40 West
Use the straight / left lanes.
6
Merge onto I 64; US 40
3.4 mi
·
4 min
·
Daniel Boone Expressway
Use the straight lane.
7
Continue on I 64; US 40; US 61
1.8 mi
·
2 min
·
Avenue of the Saints
Use the straight lane.
8
Take the exit
0.1 mi
·
16 sec
Exit 25
Toward I 270: Memphis, Chicago
Use the slight right lane.
9
Keep slight right at fork
0.3 mi
·
25 sec
Toward I 270 North: Chicago
Use the slight right lane.
10
Merge onto I 270
6.1 mi
·
7 min
·
I 270
Use the straight lane.
11
Take the exit
1.0 mi
·
1 min
Exit 20A
Toward I 70: Kansas City, Saint Louis, Saint Louis Lambert International Airport
Use the slight right lane.
12
Keep slight left at fork
0.1 mi
·
11 sec
Toward I 70 West: Kansas City
Use the slight left lane.
13
Continue on this road
0.6 mi
·
57 sec
·
this road
Exit 20B
Toward I 70 West: Kansas City
14
Merge onto I 70
14 mi
·
16 min
·
I 70
Use the straight / slight right lanes.
15
Take the exit
390 ft
·
8 sec
Exit 218
Toward MO K: O'Fallon, Main Street
Use the slight right lane.
16
Turn straight onto East Terra Lane
0.9 mi
·
1 min
·
East Terra Lane
Use the straight lane.
17
Turn right onto South Main Street
0.5 mi
·
1 min
·
South Main Street
18
Turn right
25 ft
·
1 sec
19
Arrive at destination
Fuel & Cost
Regular Gas
$4.66 one way
$9.32 round trip
$3.97/gal
25.4 MPG avg
10 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $5.12 | $10.23 |
| premium | $4.89 | $5.73 | $11.47 |
| diesel | $5.61 | $6.58 | $13.16 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 10.4 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $3 in charging · 0 stops · 70% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 8.9 | 0 | $3.13 | $1.43 |
| Efficient EV | 7.5 | 0 | $2.61 | $1.19 |
| EV Truck/SUV | 11.9 | 0 | $4.17 | $1.91 |
Gas CO2
10 kg
EV CO2
3 kg (70% 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
Morning in O'Fallon on Saturday
Local time
7:39 AM
CDT
Current temp
85°F
Mostly Sunny then Chance Showers And Thunderstorms
S 9 to 14 mph
36% chance
Live forecast
Flood Warning
Flood Warning issued April 17 at 9:07AM CDT until April 23 at 1:23AM CDT by NWS Kansas City/Pleasant Hill MO
Flood Warning
Flood Warning issued April 17 at 9:07AM CDT until April 19 at 1:57PM CDT by NWS Kansas City/Pleasant Hill MO
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
7 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
40m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
Frequently Asked Questions
The drive from Brentwood, MO to O'Fallon, MO covers 29.8 miles and takes about 40m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 70, I 270, Daniel Boone Expressway. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 14.9 miles from Brentwood, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $4.66 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 short but busy drive. With 15 decision points packed into just 29.8 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 40m.
The main spots that need attention: at 1 miles: Lane positioning matters here. Multiple destination signs - pick the right one; at 6.5 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 6.6 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Between Brentwood, MO and O'Fallon, MO, road signs point toward Chicago, Saint Louis, Saint Louis Lambert International Airport and Mo K: O'fallon.
Yes. Nearby national parks include Gateway Arch National Park.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
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