Seymour, MO to Saint Peters, MO is 205 miles and takes about 4 hours 10 minutes via I 44, with a fuel budget near $32 and enough daylight to finish in a day. This trip stays within the Midwest, traversing Missouri for its entirety. It's a straightforward drive, mostly on the interstate, making it a convenient option for a single day of travel. You'll find the route quite accessible and efficient, suitable for those prioritizing directness over extensive sightseeing.
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
102.7 miles from Seymour, MO
A natural place for your longest stop of the day
, about 2h 1m into the drive
.
Main Roads
Road
Distance
Duration
I 44
150 mi
2h 41m
Manchester Road
13.4 mi
18m
MO A
12.2 mi
17m
MO 109
4.9 mi
7m
Mid Rivers Mall Drive
4.7 mi
9m
US 60
4 mi
4m
MO 94
3.4 mi
4m
Avenue of the Saints
2.7 mi
3m
Longest stretch:
I 44
— 150 mi, about 2h 41m
Turn-by-Turn Driving Directions
Step-by-step road directions between Seymour, MO and Saint Peters, MO.
1
Start on West Washington Street
165 ft·12 sec·West Washington Street
2
Turn left onto MO K
0.2 mi·29 sec·South Main Street
3
Turn left onto West Clinton Avenue
1.1 mi·1 min·West Clinton Avenue
4
Continue on West Steel Street
0.1 mi·19 sec·West Steel Street
5
Turn left onto US 60
4.0 mi·4 min·US 60
6
Turn right onto North Diggins Main Street
113 ft·10 sec·North Diggins Main Street
7
Turn left onto West Springfield Avenue
430 ft·18 sec·West Springfield Avenue
8
Continue on this road
0.5 mi·1 min·this road
9
Turn right onto MO A
12 mi·17 min·MO A
10
Turn right onto Commercial Street
0.2 mi·32 sec·Commercial Street
11
Turn left onto South Pine Street
0.9 mi·2 min·South Pine Street
12
Turn sharp left onto US Historic 66
0.3 mi·28 sec·East Hubble Drive
13
Turn right onto North Marshall Street
0.8 mi·1 min·North Marshall Street
14
Continue on North Marshall Road
0.3 mi·49 sec·North Marshall Road
15
Enter roundabout
132 ft·2 sec
16
Continue
0.2 mi·27 sec
17
Merge onto I 44
150 mi·2 hr 41 min·I 44
18
Take the exit
0.2 mi·27 sec
Exit 253Toward I 44 Business, MO 100 East: Gray SummitUse the slight right lane.
19
Turn left onto MO 100
13 mi·18 min·Manchester Road
Use the straight lane.
20
Take the exit
0.2 mi·30 sec
Toward MO 109
21
Enter roundabout onto MO 109
224 ft·4 sec·MO 109
22
Continue on MO 109
515 ft·10 sec·MO 109
23
Enter roundabout onto MO 109
98 ft·1 sec·MO 109
24
Continue on MO 109
0.4 mi·45 sec·MO 109
25
Enter roundabout onto MO 109
94 ft·2 sec·MO 109
26
Continue on MO 109
4.3 mi·6 min·MO 109
27
Enter roundabout onto South Eatherton Road
94 ft·1 sec·South Eatherton Road
28
Continue on South Eatherton Road
2.4 mi·4 min·South Eatherton Road
29
Continue on Olive Street Road
0.9 mi·1 min·Olive Street Road
30
Take the ramp onto Chesterfield Airport Road
0.7 mi·1 min·Chesterfield Airport Road
31
Merge onto I 64; US 40; US 61
2.7 mi·3 min·Avenue of the Saints
Use the straight lane.
32
Take the exit
0.2 mi·15 sec
Exit 10Toward MO 94: Defiance, Saint CharlesUse the slight right lane.
33
Keep slight right at fork
313 ft·4 sec
Toward MO 94 East: Saint CharlesUse the right lane.
34
Merge onto MO 94
3.4 mi·4 min·MO 94
Use the right lane.
35
Keep slight right at fork
0.2 mi·22 sec
Toward Mid Rivers Mall Drive, Pitman Hill RoadUse the straight / slight right lanes.
36
Turn left onto Mid Rivers Mall Drive
4.7 mi·9 min·Mid Rivers Mall Drive
Use the left / straight lanes.
37
Take the ramp
0.3 mi·20 sec
Toward I 70 West: WentzvilleUse the slight left lane.
38
Merge onto I 70
479 ft·6 sec·I 70
39
Arrive at destination
I 70
Trip Plan
Given the 4-hour drive time, departing in the morning allows ample time to reach Saint Peters before evening. You'll want to plan for one stop, perhaps around the halfway mark, to stretch your legs and refuel. The fuel cost is estimated at $32, so keep that in mind for your budget. Since the longest continuous stretch is 150 miles on I 44, be sure to fill up before embarking on that segment if you're concerned about gas availability. The relatively short duration means you have flexibility if you decide to leave a little later.
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 102.7 miles from Seymour, MO, or about 2h 1m into the drive.
The longest continuous stretch on this route runs about 150 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 59m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 102.7 miles or 2h 1m 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 12m
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 Seymour, 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 Seymour, MO
This is one driving day of about 205.4 miles and 4h 10m.
Your first comfortable stop window is around 45 miles from Seymour, 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 44 for about 150 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 28
5 decision points cluster between mile 0 and 200.1 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0 mi into trip|~0m in|MO K / South Main Street
Turn left onto MO K / South Main Street
Navigation decision point
8
171 mi into trip|~3h 15m in
Take the exit toward I 44 Business, MO 100 East: Gray Summit
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 253
Toward I 44 Business, MO 100 East: Gray Summit
8
196.4 mi into trip|~3h 54m in
Take the exit toward MO 94: Defiance, Saint Charles
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 10
Toward MO 94: Defiance, Saint Charles
8
196.6 mi into trip|~3h 54m in
Keep slight right at fork toward MO 94 East: Saint Charles
Highway fork - watch signs carefully. Lane positioning matters here
Use the right lane.
Toward MO 94 East: Saint Charles
8
200.1 mi into trip|~3h 59m in
Keep slight right at fork toward Mid Rivers Mall Drive, Pitman Hill Road
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward Mid Rivers Mall Drive, Pitman Hill Road
Fuel & Cost
Regular Gas
$32.11 one way
$64.22 round trip
$3.97/gal25.4 MPG avg72 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$35.26
$70.52
premium
$4.89
$39.53
$79.05
diesel
$5.61
$45.35
$90.70
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$32
Meals
$25–$50
Total
$57–$82
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 71.9 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $22 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
61.6
0
$21.57
$9.86
Efficient EV
51.4
0
$17.97
$8.22
EV Truck/SUV
82.2
1
$28.76
$13.15
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 Apr 20, 2026
Origin
Seymour, MO
Late night
in Seymour on Tuesday
Local time
5:43 AM
CDT
Current temp
71°F
Unavailable
Live forecast
Destination
Saint Peters, MO
Late night
in Saint Peters on Tuesday
Local time
5:43 AM
CDT
Current temp
71°F
Unavailable
Live forecast
69°F
Washington, 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
Very similar conditions
Both ends of the route are sitting at about the same temperature right now.
Road read
4h 10m 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.
Gateway Arch National Park
National Park
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...
25 mi from route
~63 min detour
$19
near mile 184.1
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is predominantly highway, with 79% of the drive on major interstates. You'll experience a longest stretch of 150 miles on I 44 before transitioning to surface roads like Manchester Road and MO A. Expect a steady pace with frequent exits along the interstate portion. The latter part of the drive will involve more local traffic and lower speed limits as you approach your destination.
79% highway — fuel and pacing are the main things to plan.
39 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 150 mi on I 44.
How Hard Is This Drive?
10/10
This is a straightforward highway drive that stays mostly on I 44 and Manchester Road. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes early in the drive near MO K / South Main Street.
Driving Effort10/10
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 28 significant decision points across 205.4 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: near the start (MO K / South Main Street): Navigation decision point; at 171 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 196.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 4h 10m. Total distance: 205.4 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
4h 10m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (79%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 150 miles on I 44. The full list of main roads is in the Roads section above.
Yes — we found about 16 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 16 rest areas along the route for bathroom stops.
The main spots that need attention: near the start (MO K / South Main Street): Navigation decision point; at 171 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 196.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Gateway Arch National Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 4.2 hours each way, an in-and-out day trip would put you behind the wheel for 8.3 hours — manageable with a long break at Saint Peters, MO, but most travelers stay overnight.
