Origin
Chesterfield, MO
Late night in Chesterfield on Sunday
Local time
2:33 AM
CDT
Current temp
57°F
Unavailable
Live forecast
Trip from Chesterfield, 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
30m
Distance
20.6 mi
33 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$3
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 28m
★
6 AM
0h 30m
8 AM
0h 36m
10 AM
0h 32m
12 PM
0h 32m
3 PM
0h 33m
5 PM
0h 35m
8 PM
0h 29m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Chesterfield, MO
Wikimedia Commons
Affton, MO
Wikimedia Commons
Trip Overview
Chesterfield, MO to Affton, MO is 20.6 miles and takes about 30m via I 270, with a fuel budget near $3 and enough daylight to finish in a day. This short trip stays within the Midwest region, specifically Missouri, making it a straightforward local excursion. The drive primarily utilizes interstate highways mixed with some state routes, offering a practical way to traverse the suburban landscape. Given its brevity, this route is ideal for a quick errand or a segment of a larger regional journey without requiring an overnight stay.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 270 | 8.1 mi | 10m |
| Avenue of the Saints | 6.8 mi | 8m |
| MO 30 | 4.1 mi | 7m |
| Baxter Road | 0.3 mi | <1m |
| Old Chesterfield Road | 0.1 mi | <1m |
| Santa Maria Drive | <0.1 mi | <1m |
Longest stretch:
I 270
— 8.1 mi, about 10m
Turn-by-Turn Driving Directions
Step-by-step road directions between Chesterfield, MO and Affton, MO.
1
Start on Santa Maria Drive
107 ft
·
8 sec
·
Santa Maria Drive
2
Turn left onto Old Chesterfield Road
0.1 mi
·
32 sec
·
Old Chesterfield Road
3
Turn right onto Baxter Road
0.3 mi
·
36 sec
·
Baxter Road
4
Take the ramp
0.2 mi
·
23 sec
Toward I 64 East, US 40 East, US 61 South
5
Merge onto I 64; US 40; US 61
6.8 mi
·
8 min
·
Avenue of the Saints
Use the straight lane.
6
Take the exit
0.3 mi
·
38 sec
Exit 25
Toward I 270: Chicago, Memphis
Use the slight right lane.
7
Keep slight right at fork
0.3 mi
·
31 sec
Toward I 270 South: Memphis
Use the slight right lane.
8
Merge onto I 270
8.1 mi
·
10 min
·
I 270
Use the straight lane.
9
Take the exit
0.3 mi
·
33 sec
Exit 3
Toward MO 30: Gravois Road
Use the slight right lane.
10
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.
11
Merge onto MO 30
4.1 mi
·
7 min
·
MO 30
12
Turn right
38 ft
·
7 sec
13
Turn left
87 ft
·
6 sec
14
Arrive at destination
Heads-up: tricky spots
5 of 125 decision points cluster between mile 0.4 and 16.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.4 mi into trip
|
~1m in
Take the ramp toward I 64 East, US 40 East, US 61 South
Multiple destination signs - pick the right one
Toward I 64 East, US 40 East, US 61 South
8
7.4 mi into trip
|
~10m 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 25
Toward I 270: Chicago, Memphis
7
7.8 mi into trip
|
~10m 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
16.2 mi into trip
|
~21m 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
16.5 mi into trip
|
~22m 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
$3.22 one way
$6.44 round trip
$3.97/gal
25.4 MPG avg
7 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $3.54 | $7.07 |
| premium | $4.89 | $3.96 | $7.93 |
| diesel | $5.61 | $4.55 | $9.10 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$3
Estimated CO2 emission: 7.2 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $2 in charging · 0 stops · 71% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 6.2 | 0 | $2.16 | $0.99 |
| Efficient EV | 5.2 | 0 | $1.80 | $0.82 |
| EV Truck/SUV | 8.2 | 0 | $2.88 | $1.32 |
Gas CO2
7 kg
EV CO2
2 kg (71% 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
30m 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 presents a mixed profile, with 59% of the journey on highways. You'll experience a significant stretch of 8.1 miles on I 270, which provides a faster-paced, more direct connection. As you transition from the interstate, expect the road character to shift, incorporating Avenue of the Saints and MO 30. This variation means you'll navigate both higher-speed highway driving and potentially more local road conditions as you approach your destination.
59% highway, the rest on surface roads — varied driving throughout.
14 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 8.1 mi on I 270.
How Hard Is This Drive?
9/10
This route mixes highway mileage with some local-road sections near the start or finish. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.4 miles in.
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 20.6 miles, you will need to pay attention to lane changes and exits — but the whole thing is over in 30m.
Where does it get tricky?
The main spots that need attention: at 0.4 miles: Multiple destination signs - pick the right one; at 7.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 7.8 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 Chesterfield, MO and Affton, MO, road signs point toward Memphis and Ulysses S. Grant National Historic Site.
Memphis
7.4 mi in
|
~10m
Ulysses S. Grant National Historic Site
16.5 mi in
|
~22m
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 30m. Total distance: 20.6 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
30m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (59%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 8.1 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 0.4 miles: Multiple destination signs - pick the right one; at 7.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 7.8 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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