Bethany, MO to Saint Peters, MO is 206.4 miles and takes about 4h 6m via I-55, I-270, and I-70, with a fuel budget near $32 and enough daylight to finish in a day. This trip stays within Missouri, traversing the Midwest for its entirety. Expect a straightforward drive, primarily on major interstates, making it a convenient option for a quick transfer between these two points. It's a solid choice if you're looking for a functional route with minimal fuss.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
103.2 miles from Bethany, MO
A natural place for your longest stop of the day
, about 2h 8m into the drive
.
Main Roads
Road
Distance
Duration
I 55
129 mi
2h 18m
I 270
18.1 mi
22m
I 70
10.5 mi
13m
North Walnut Street
10.5 mi
15m
US 60
7.1 mi
8m
MO U
6.7 mi
11m
MO H
3 mi
7m
Rosa Parks Highway
1.3 mi
1m
Longest stretch:
I 55
— 129 mi, about 2h 18m
Traffic on I-70
Hour-of-day weekday pattern from 11 FHWA count stations on your route.
Peak
4 PM
~6,589 veh/hr typical
Quietest
2 AM
~547 veh/hr
Peak-to-quiet ratio
12×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Bethany, MO and Saint Peters, MO.
1
Start on County Road 102
0.8 mi·3 min·County Road 102
2
Turn right onto MO H
3.0 mi·7 min·MO H
3
Turn right onto MO U
6.7 mi·11 min·MO U
4
Turn left onto MO 25
10 mi·15 min·North Walnut Street
5
Take the ramp
16 mi·18 min
6
Continue on US 60
7.1 mi·8 min·US 60
7
Take the exit
0.3 mi·43 sec
Exit 1BToward I 55 North: Saint Louis
8
Merge onto I 55
27 mi·29 min·I 55
9
Keep slight left at fork onto I 55
102 mi·1 hr 49 min·I 55
10
Continue on I 55
1.3 mi·1 min·Rosa Parks Highway
11
Take the exit
0.2 mi·27 sec
Exit 196Toward I 270 West, I 255 East: Kansas City, ChicagoUse the slight right lane.
12
Keep slight left at fork
388 ft·8 sec
Toward I 270 West: Kansas CityUse the slight left lane.
13
Continue on this road
0.7 mi·1 min·this road
Exit 196Toward I 270 West
14
Merge onto I 270
18 mi·22 min·I 270
Use the straight lane.
15
Take the exit
1.0 mi·1 min
Exit 20AToward I 70: Kansas City, Saint Louis, Saint Louis Lambert International AirportUse the slight right lane.
16
Keep slight left at fork
0.1 mi·11 sec
Toward I 70 West: Kansas CityUse the slight left lane.
17
Continue on this road
0.6 mi·57 sec·this road
Exit 20BToward I 70 West: Kansas City
18
Merge onto I 70
11 mi·13 min·I 70
Use the straight / slight right lanes.
19
Arrive at destination
I 70
Trip Plan
For this 4-hour drive, you can easily depart Bethany, MO in the morning and arrive in Saint Peters, MO the same day. Given the relatively short duration, there's no need to split the drive, offering flexibility in your departure time. The longest stretch without a major town is 129 miles on I-55, so plan your fuel and rest stops accordingly before you hit that segment. Keep an eye on traffic, especially as you get closer to the St. Louis area, which can add time to your estimated 4h 6m duration.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 103.2 miles from Bethany, MO, or about 2h 8m into the drive.
The longest continuous stretch on this route runs about 129 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 45 miles or 1h 6m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 103.2 miles or 2h 8m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 19m
Traffic, exits, and arrival timing usually matter more near Saint Peters, MO than in the middle of the route.
Before You Leave
+
Open the route before leaving Bethany, 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 Bethany, MO
This is one driving day of about 206.4 miles and 4h 6m.
Your first comfortable stop window is around 45 miles from Bethany, MO.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on I 55 for about 129 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 12
5 decision points cluster between mile 44.2 and 195.1 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
44.2 mi into trip|~1h 4m in
Take the exit toward I 55 North: Saint Louis
Exit ramp - move to the correct lane early
Exit 1B
Toward I 55 North: Saint Louis
8
174.8 mi into trip|~3h 26m in
Take the exit toward I 270 West, I 255 East: Kansas City, 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 196
Toward I 270 West, I 255 East: Kansas City, Chi...
8
175.1 mi into trip|~3h 26m in
Keep slight left at fork toward I 270 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left lane.
Toward I 270 West: Kansas City
8
194 mi into trip|~3h 50m 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...
7
195.1 mi into trip|~3h 51m in
Keep slight left at fork toward I 70 West: Kansas City
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight left lane.
Toward I 70 West: Kansas City
Fuel & Cost
Regular Gas
$30.48 one way
$60.96 round trip
$3.75/gal25.4 MPG avg72 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.14
$33.65
$67.30
premium
$4.72
$38.32
$76.64
diesel
$4.80
$38.97
$77.94
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$30
Meals
$25–$50
Total
$55–$80
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 72.2 kg one way.
Prices: EIA weekly data, 2026-07-13.
EV Charging Along Route
40 DC fast chargers
· Coverage: excellent
Festus, MO Rechargery @ Schnucks - W Gannon Dr
Festus, MO
IONNA
10 DCFC
Mehlville, MO - Tesla Supercharger
Saint Louis County, MO
Tesla
10 DCFC
Fenton, MO Rechargery Relay @ Wally's - Assembly Parkway
Station data from NREL Alternative Fuel Stations database.
Driving Electric?
About $22 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
61.9
0
$21.67
$9.91
Efficient EV
51.6
0
$18.06
$8.26
EV Truck/SUV
82.6
1
$28.90
$13.21
Gas CO2
72 kg
EV CO2
24 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 as of Jul 19, 2026
Origin
Bethany, MO
Late night
in Bethany on Sunday
Local time
1:38 AM
CDT
Current temp
74°F
Slight Chance Showers And Thunderstorms
WSW 0 to 5 mph20% chanceLive forecast
Heat Advisory
Heat Advisory issued July 18 at 7:55PM CDT until July 19 at 9:00PM CDT by NWS Memphis TN
Special Weather Statement
Special Weather Statement issued July 18 at 7:39PM CDT by NWS Paducah KY
Destination
Saint Peters, MO
Late night
in Saint Peters on Sunday
Local time
1:38 AM
CDT
Current temp
75°F
Slight Chance Showers And Thunderstorms
W 1 to 5 mph18% chanceLive forecast
Heat Advisory
Heat Advisory issued July 18 at 7:55PM CDT until July 19 at 9:00PM CDT by NWS Memphis TN
Special Weather Statement
Special Weather Statement issued July 18 at 7:39PM CDT by NWS Paducah KY
90°F
Crystal City, MO
103 mi in
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 warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
4h 6m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Ste. Geneviève National Historical Park
National Historical Park
Established by 1750, Ste. Geneviève was the first permanent European settlement in Missouri. Early French Canadian settlers were drawn here by the rich agricultural land known as Le Grand Champ (the B...
5 mi from route
~13 min detour
Free
near mile 128.1
Gateway Arch National Park commemorates President Jefferson’s vision of a continental nation, the individuals and cultural groups who helped shape its history, St. Louis’ role in westward expansion, a...
13 mi from route
~32 min detour
$19
near mile 177.9
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This drive is mostly highway, with 80% of the 206.4 miles on interstates. You'll experience a long stretch of 129 miles on I-55, indicating significant time spent on this major artery. Expect a lot of exits as you navigate through populated areas, particularly as you approach and pass through the St. Louis metropolitan area on I-270 and I-70.
80% highway — fuel and pacing are the main things to plan.
19 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 129 mi on I 55.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on I 55 and I 270. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 44.2 miles in.
Driving Effort9/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 12 significant decision points across 206.4 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 44.2 miles: Exit ramp - move to the correct lane early; at 174.8 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 175.1 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Elevation Profile
Mostly flat terrain
601 ft299 ft
Total Climb
578 ft
Total Descent
562 ft
Highest Point
601 ft
~103.2 mi in
Elevation Range
302 ft
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Bethany, MO and Saint Peters, MO, road signs point toward Chicago, Saint Louis and Saint Louis Lambert International Airport.
Doable as a same-day drive at 4h 6m. Total distance: 206.4 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
4h 6m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (80%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 129 miles on I 55. The full list of main roads is in the Roads section above.
Yes — we found about 10 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
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 Saint Peters, MO before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 10 rest areas along the route for bathroom stops.
The main spots that need attention: at 44.2 miles: Exit ramp - move to the correct lane early; at 174.8 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 175.1 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Yes — Ste. Geneviève National Historical Park and Gateway Arch National Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 4.1 hours each way, an in-and-out day trip would put you behind the wheel for 8.2 hours — manageable with a long break at Saint Peters, MO, but most travelers stay overnight.
