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Trip from Saint Peters, MO to Byrnes Mill, MO

Drive Time

56m

Distance

42.8 mi

69 km

Drive Score

6/10

Good drive

Same Day?

Yes, doable

Fuel Cost

$7

one way

Best Time to Leave

Save up to 14 min
4 AM
0h 52m ★
6 AM
0h 57m
8 AM
1h 6m
10 AM
1h 0m
12 PM
0h 59m
3 PM
1h 1m
5 PM
1h 6m
8 PM
0h 54m

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 Saint Peters, MO, MO

Saint Peters, MO

Aleksandra Żmuda

Downtown Byrnes Mill, MO, MO

Byrnes Mill, MO

Valeria Boltneva

Trip Overview

If you are planning to travel from Saint Peters to Byrnes Mill, you are looking at a straightforward 42.8-mile trip that typically takes about 56 minutes. This route is designed as a one-day excursion, making it an efficient choice for travelers who want to move between these two Missouri locations without the need for an overnight stay. Expect to spend approximately $7 on fuel for the journey, keeping the trip budget-friendly. Because both the origin and destination are situated within the Midwest, the drive maintains a consistent regional feel throughout. It is a highly practical connection that serves as a direct link across the area.

Trip Pace

Same-day drive is realistic

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

Break Rhythm

0 planned breaks

A short stop every 2 to 3 hours is enough for this drive.

Midpoint

21.4 miles from Saint Peters, MO

A natural place for your longest stop of the day , about 27m into the drive .

Drive Character

This drive is heavily highway-focused, with 93% of the journey taking place on major thoroughfares. You will spend the bulk of your time navigating I-70, I-270, and MO-30 to reach your destination. Be prepared for a standard interstate experience, highlighted by a longest uninterrupted stretch of 15.6 miles on I-270. While the route is efficient, it lacks the technical curves of backroads, functioning instead as a fast-paced transit corridor. You can expect a consistent, predictable rhythm behind the wheel as you transition between these key Missouri highways.

Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 16 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 270 is the longest continuous segment at about 15.6 miles.

Elevation Profile

Mostly flat terrain

881 ft 422 ft

Total Climb

754 ft

Total Descent

728 ft

Highest Point

881 ft

~39.2 mi in

Elevation Range

459 ft

How Hard Is This Drive?

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 1.2 miles in.

Route Complexity 10/10

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

This is a demanding drive. With 12 significant decision points across 42.8 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 1.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 13.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 13.8 miles: Highway fork - watch signs carefully. Lane positioning matters here.

Critical Maneuvers

5 of 12 key points

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

8
1.2 mi into trip | ~1m in

Take the exit toward MO 79: Elsberry, Louisiana

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

Use the straight / slight right lanes. Exit 220 Toward MO 79: Elsberry, Louisiana
8
13.6 mi into trip | ~17m 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
13.8 mi into trip | ~17m 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
29.9 mi into trip | ~37m 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
30.2 mi into trip | ~38m 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

Towns Along This Route

On the drive from Saint Peters, MO to Byrnes Mill, MO, road signs begin pointing toward Memphis along the way.

Memphis

13.6 mi in | ~17m

Main Roads

Road Distance Duration
I 270 15.6 mi 19m
I 70 13 mi 16m
MO 30 11.1 mi 14m
Upper Byrnes Mill Road 1.4 mi 3m
MO 79 0.1 mi <1m
Longest stretch: I 270 — 15.6 mi, about 19m

Turn-by-Turn Driving Directions

Step-by-step road directions between Saint Peters, MO and Byrnes Mill, MO.

1

Start on I 70

1.2 mi · 1 min · I 70
2

Take the exit

0.1 mi · 15 sec
Exit 220 Toward MO 79: Elsberry, Louisiana Use the straight / slight right lanes.
3

Keep slight left at fork

384 ft · 14 sec
Toward MO 79
4

Turn left onto MO 79

0.1 mi · 11 sec · MO 79
5

Take the ramp

0.2 mi · 18 sec
Toward I 70 East Use the right lane.
6

Merge onto I 70

12 mi · 14 min · I 70
Use the straight / slight right lanes.
7

Take the exit

0.2 mi · 12 sec
Exit 232 Toward I 270: Chicago, Memphis Use the slight right lane.
8

Keep slight right at fork

0.4 mi · 33 sec
Toward I 270 South: Memphis Use the slight right lane.
9

Continue on this road

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

Merge onto I 270

16 mi · 19 min · I 270
Use the straight lane.
11

Take the exit

0.3 mi · 33 sec
Exit 3 Toward MO 30: Gravois Road Use the slight right lane.
12

Keep slight right at fork

306 ft · 7 sec
Toward MO 30 West: Fenton Use the right lane.
13

Merge onto MO 30

11 mi · 14 min · MO 30
Use the straight lane.
14

Take the exit

109 ft · 3 sec
Toward Upper Byrnes Mill Road
15

Turn slight right onto Upper Byrnes Mill Road

1.4 mi · 3 min · Upper Byrnes Mill Road
16

Arrive at destination

Upper Byrnes Mill Road

Trip Plan

Since this is a short trip under an hour, you have plenty of flexibility regarding your departure time. You will not need to plan for any formal stops, as the 42.8-mile distance is easily manageable in a single stint. Keep in mind that because the route relies so heavily on interstates like I-270, you should check for typical traffic patterns on those major arteries before you head out. Prioritize a full tank before leaving Saint Peters to easily cover the $7 estimated fuel cost for the duration of the drive. Embracing the direct nature of this path allows you to maximize your time once you arrive in Byrnes Mill.

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 21.4 miles from Saint Peters, MO, or about 27m into the drive.
The longest continuous stretch on this route runs about 15.6 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 42.8 miles or 56m in

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

Halfway reset

Around 21.4 miles or 27m in

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

Final approach

Final hour starts around 46m

Traffic, exits, and arrival timing usually matter more near Byrnes Mill, MO than in the middle of the route.

Before You Leave

+

Open the route before leaving Saint Peters, 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 Saint Peters, MO

This is one driving day of about 42.8 miles and 56m.

Your first comfortable stop window is around 80 miles from Saint Peters, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
You may only need one short stretch stop if conditions stay smooth.
The longest stretch is on I 270 for about 15.6 miles.

Where to Stop

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

Halfway Point

Midpoint

About 21.4 mi from Saint Peters, MO · 27m into the drive

Downtown East Saint Louis, IL, IL

Mid-route town

Meal stop

East Saint Louis, IL

21 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

Cahokia, IL

Fuel and coffee

A short stop after about 42.8 miles helps settle the day before fatigue starts building.

East Saint Louis, IL

Meal break

The midpoint is around 21.4 miles from Saint Peters, MO, which is a good place for a longer meal and fuel stop.

Arriving in Byrnes Mill, MO

The final approach into Byrnes Mill, 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 Byrnes Mill, MO.

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

Fuel & Cost

Regular Gas

$6.50 one way

$13.00 round trip

$3.86/gal 25.4 MPG avg 15 kg CO2
Fuel Type $/gal One Way Round Trip
midgrade $4.25 $7.17 $14.33
premium $4.80 $8.08 $16.16
diesel $5.64 $9.51 $19.02

No toll roads detected on this route.

Estimated Trip Cost (one way, 1 person)

Fuel

$7

Meals

$25–$50

Total

$32–$57

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

Estimated CO2 emission: 15 kg one way. Prices: EIA weekly data, 2026-04-06.

Driving Electric?

About $4 in charging · 0 stops · 67% less CO2

Vehicle Type kWh Stops DC Fast Home Charge
Average EV 12.8 0 $4.49 $2.05
Efficient EV 10.7 0 $3.74 $1.71
EV Truck/SUV 17.1 0 $5.99 $2.74

Gas CO2

15 kg

EV CO2

5 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 data refreshed 11 hours ago

Origin

Saint Peters, MO

Afternoon in Saint Peters on Sunday

Local time

2:57 PM

CDT

Current temp

62°F

Partly Cloudy

S 8 mph 2% chance Live forecast

Special Weather Statement

Special Weather Statement issued April 12 at 12:21AM CDT by NWS Paducah KY

Flood Warning

Flood Warning issued April 11 at 9:46PM CDT until April 18 at 1:00PM CDT by NWS St Louis MO

Destination

Byrnes Mill, MO

Afternoon in Byrnes Mill on Sunday

Local time

2:57 PM

CDT

Current temp

61°F

Mostly Cloudy

S 6 mph 1% chance Live forecast

Special Weather Statement

Special Weather Statement issued April 12 at 12:21AM CDT by NWS Paducah KY

Flood Warning

Flood Warning issued April 11 at 9:46PM CDT until April 18 at 1:00PM CDT by NWS St Louis MO

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

1 degrees cooler at arrival

A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.

Road read

56m 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 Saint Peters, MO to Byrnes Mill, MO covers 42.8 miles and takes about 56m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 270, I 70, MO 30. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 21.4 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 $6.50 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 12 significant decision points across 42.8 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 1.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 13.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 13.8 miles: Highway fork - watch signs carefully. Lane positioning matters here.
On the drive from Saint Peters, MO to Byrnes Mill, MO, road signs begin pointing toward Memphis along the way.

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