Origin
O'Fallon, MO
Late night in O'Fallon on Sunday
Local time
2:33 AM
CDT
Current temp
57°F
Unavailable
Live forecast
Trip from O'Fallon, MO to Affton, MO
Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 19, 2026 · Editorial standards
Drive Time
49m
Distance
35.9 mi
58 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$6
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 46m
★
6 AM
0h 50m
8 AM
0h 58m
10 AM
0h 52m
12 PM
0h 52m
3 PM
0h 53m
5 PM
0h 57m
8 PM
0h 47m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
O'Fallon, MO
Wikimedia Commons
Affton, MO
Wikimedia Commons
Trip Overview
O'Fallon, MO to Affton, MO is 35.9 miles and takes about 49 minutes via I-270, I-70, and MO-30, with a fuel budget near $6 and enough daylight to finish in a day. This is a straightforward drive within the Midwest, specifically between two points in Missouri. Given its short duration and focus on major highways, it's an efficient way to cover the distance. You'll likely find it to be a practical, no-frills journey ideal for a quick commute or connecting between these two areas without significant detours.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 270 | 15.6 mi | 19m |
| I 70 | 13.5 mi | 16m |
| MO 30 | 4.1 mi | 7m |
| Drennen Parkway | 0.9 mi | 1m |
| South Main Street | 0.6 mi | 1m |
Longest stretch:
I 270
— 15.6 mi, about 19m
Turn-by-Turn Driving Directions
Step-by-step road directions between O'Fallon, MO and Affton, 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 left at fork
396 ft
·
11 sec
Toward MO 30: Saint Louis, Ulysses S. Grant National Historic Site, Gravois Road
Use the left lane.
12
Merge onto MO 30
4.1 mi
·
7 min
·
MO 30
13
Turn right
38 ft
·
7 sec
14
Turn left
87 ft
·
6 sec
15
Arrive at destination
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Mid-route town
Meal stop
18 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
Fuel and coffee
A short stop after about 35.9 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 17.9 miles from O'Fallon, MO, which is a good place for a longer meal and fuel stop.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Heads-up: tricky spots
5 of 125 decision points cluster between mile 0.6 and 31.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.6 mi into trip
|
~1m in
|
Drennen Parkway
Turn left onto Drennen Parkway
Lane positioning matters here
Use the left lane.
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
9
31.7 mi into trip
|
~41m in
Keep slight left at fork toward MO 30: Saint Louis, Ulysses S. Grant National Historic Site, Gravois Road
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the left lane.
Toward MO 30: Saint Louis, Ulysses S. Grant Nat...
Fuel & Cost
Regular Gas
$5.61 one way
$11.23 round trip
$3.97/gal
25.4 MPG avg
13 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $6.16 | $12.32 |
| premium | $4.89 | $6.91 | $13.82 |
| diesel | $5.61 | $7.93 | $15.85 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$6
Estimated CO2 emission: 12.6 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $4 in charging · 0 stops · 69% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 10.8 | 0 | $3.77 | $1.72 |
| Efficient EV | 9 | 0 | $3.14 | $1.44 |
| EV Truck/SUV | 14.4 | 0 | $5.03 | $2.30 |
Gas CO2
13 kg
EV CO2
4 kg (69% 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
Affton, MO
Late night in Affton on Sunday
Local time
2:33 AM
CDT
Current temp
63°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
6 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
49m 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?
This drive is predominantly highway-focused, with 95% of the journey taking place on interstates. You'll experience a long, uninterrupted stretch of 15.6 miles on I-270, offering consistent speed and smooth travel. The primary roads include I-270, I-70, and MO-30, indicating a transition between major interstate corridors and a state highway. Expect a consistent driving experience with minimal interruptions, characteristic of a Midwestern interstate commute.
95% highway — fuel and pacing are the main things to plan.
15 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 15.6 mi on I 270.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on I 270 and I 70. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.6 miles in near Drennen Parkway.
Driving Effort
9/10
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 12 decision points packed into just 35.9 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 49m.
Where does it get tricky?
The main spots that need attention: at 0.6 miles (Drennen Parkway): Lane positioning matters here; 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.
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.
Between O'Fallon, MO and Affton, MO, road signs point toward Memphis and Ulysses S. Grant National Historic Site.
Memphis
15.1 mi in
|
~20m
Ulysses S. Grant National Historic Site
31.7 mi in
|
~41m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 49m. Total distance: 35.9 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
49m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (95%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 15.6 miles on I 270. 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 Affton, 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 0.6 miles (Drennen Parkway): Lane positioning matters here; 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.
Yes. A round trip is manageable in a single day if you plan a break at Affton, 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.
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