Origin
Saint Peters, MO
Late night in Saint Peters on Saturday
Local time
4:00 AM
CDT
Current temp
57°F
Unavailable
Live forecast
Trip from Saint Peters, MO to Affton, MO
Compiled and reviewed by the Trip.ovh planning team at COD Solutions Oy · Last reviewed Apr 18, 2026 · Editorial standards
Drive Time
46m
Distance
34.4 mi
55 km
Drive Score
6/10
Good drive
Same Day?
Yes, doable
Fuel Cost
$5
one way
EV Charging
Unknown
Best Time to Leave
4 AM
0h 43m
★
6 AM
0h 47m
8 AM
0h 54m
10 AM
0h 49m
12 PM
0h 49m
3 PM
0h 50m
5 PM
0h 54m
8 PM
0h 44m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Saint Peters, MO
Wikimedia Commons
Affton, MO
Wikimedia Commons
Trip Overview
The drive from Saint Peters, MO to Affton, MO covers 34.4 miles and takes about 46m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.
The route leans on MO 79, I 70 East, I 270 for much of the mileage, and the overall profile is turn-heavy local drive. At current regular gas prices, budget about $5.38 one way before food or hotel costs.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 46m. Total distance: 34.4 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
46m drive, comfortable solo distance.
EV Driver
0 DC fast chargers along the route. Coverage: unknown.
First-Time Driver
Mostly highway driving (0%). Straightforward navigation.
Scenic Drive
Turn-heavy local drive route profile.
Drive Character
Expect a 46m drive with frequent turns across 34.4 miles of local and secondary roads.
This route has more turning and local-road decision points than a simple highway run.
There are about 16 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
MO 79 is one of the defining roads on this drive.
How Hard Is This Drive?
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. Navigation is very simple - set it and forget it for most of the drive.
Driving Effort
1/10
Very easy - short and simple to drive
Balances navigation complexity with total wheel time.
The drive from Saint Peters, MO to Affton, MO is easy. At 46m with 0% highway, most drivers will find it relaxed and low-stress.
Where does it get tricky?
This route does not have any notably tricky sections. Most of the drive from Saint Peters, MO to Affton, MO is straightforward, with well-signed roads and simple exits.
Main Roads
| Road | Distance | Duration |
|---|---|---|
| MO 79 | — | — |
| I 70 East | — | — |
| I 270 | — | — |
| I 270 South | — | — |
| MO 30 | — | — |
Some road-level metrics are being recalculated.
Longest stretch:
MO 79
— detailed segment metrics are refreshing.
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Peters, MO and Affton, MO.
1
Start on the route
1.2 mi
·
1 min
·
the route
2
Take the exit slight right toward MO 79: Elsberry, Louisiana
0.1 mi
·
15 sec
·
MO 79: Elsberry, Louisiana
3
Keep slight left to continue on MO 79
384 ft
·
15 sec
·
MO 79
4
Turn left
0.1 mi
·
11 sec
5
Take the ramp slight right toward I 70 East
0.2 mi
·
19 sec
·
I 70 East
6
Merge slight left
12 mi
·
14 min
7
Take the exit slight right toward I 270: Chicago, Memphis
0.2 mi
·
12 sec
·
I 270: Chicago, Memphis
8
Keep slight right to continue on I 270 South: Memphis
0.4 mi
·
33 sec
·
I 270 South: Memphis
9
Continue on I 270 South: Memphis
0.1 mi
·
10 sec
·
I 270 South: Memphis
10
Merge slight left
16 mi
·
19 min
11
Take the exit slight right toward MO 30: Gravois Road
0.3 mi
·
34 sec
·
MO 30: Gravois Road
12
Keep slight left to continue on MO 30: Saint Louis, Ulysses S. Grant National Historic Site, Gravois Road
397 ft
·
11 sec
·
MO 30: Saint Louis, Ulysses S. Grant National Historic Site, Gravois Road
13
Merge slight right
4.1 mi
·
8 min
14
Turn right
39 ft
·
8 sec
15
Turn left
89 ft
·
6 sec
16
Arrive at your destination
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 17.2 mi from Saint Peters, MO · 23m into the drive
Mid-route town
Meal stop
17 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 34 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 17.2 miles from Saint Peters, MO, which is a good place for a longer meal and fuel stop.
Arriving in Affton, MO
Allow a few extra minutes for the final approach into Affton, MO if you are unfamiliar with the area.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Fuel & Cost
Regular Gas
$5.38 one way
$10.76 round trip
$3.97/gal
25.4 MPG avg
12 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $4.36 | $5.90 | $11.81 |
| premium | $4.89 | $6.62 | $13.24 |
| diesel | $5.61 | $7.60 | $15.19 |
No toll roads detected on this route.
Drive Cost (one way)
Fuel
$5
Estimated CO2 emission: 12 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $4 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 10.3 | 0 | $3.61 | $1.65 |
| Efficient EV | 8.6 | 0 | $3.01 | $1.38 |
| EV Truck/SUV | 13.8 | 0 | $4.82 | $2.20 |
Gas CO2
12 kg
EV CO2
4 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.
Destination
Affton, MO
Late night in Affton on Saturday
Local time
4:00 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
46m 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 Saint Peters, MO to Affton, MO covers 34.4 miles and takes about 46m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are MO 79, I 70 East, I 270. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 17.2 miles from Saint Peters, MO. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $5.38 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.
The drive from Saint Peters, MO to Affton, MO is easy. At 46m with 0% highway, most drivers will find it relaxed and low-stress.
This route does not have any notably tricky sections. Most of the drive from Saint Peters, MO to Affton, MO is straightforward, with well-signed roads and simple exits.
The route from Saint Peters, MO to Affton, MO does not surface many named destination signs beyond the main corridor.
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, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
Was this helpful?
Thanks for your feedback!
Your tip has been submitted. Thanks!
/500
Recent Tips
·
Explore More
Continue From Affton, MO
More trips to Affton, MO
Explore more options from Saint Peters, MO or browse trips ending in Affton, MO.
Looking for more statewide routes? Browse MO road trips.