Ann Arbor to Flat Rock is 420.7 miles and takes about 7h 43m via I 75 and US-2 West, with a fuel budget near $67 and enough daylight to finish in a day. This trip stays entirely within Michigan, traversing the Midwest region. With nearly all highway driving, it's a straightforward route focused on covering ground efficiently. Consider this if you need a direct path between these two points 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
2 planned breaks
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
210.3 miles from Ann Arbor, MI
A natural place for your longest stop of the day
, about 3h 41m into the drive
.
Main Roads
Road
Distance
Duration
I 75
180.5 mi
3h 4m
US-2 West
130.2 mi
2h 34m
US 23 BUS
94.9 mi
1h 41m
County 416 20th Road
3.5 mi
4m
US 2
3.2 mi
3m
County 420 21st Road
3 mi
4m
North Main Street
1.2 mi
2m
M 14
1.1 mi
1m
Longest stretch:
I 75
— 180.5 mi, about 3h 4m
Traffic on I-75
Hour-of-day weekday pattern from 72 FHWA count stations on your route.
Peak
3 PM
~1,736 veh/hr typical
· worst 3,028
Quietest
2 AM
~77 veh/hr
Peak-to-quiet ratio
22.5×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 105 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 Ann Arbor, MI and Flat Rock, MI.
1
Start on South State Street
0.3 mi·42 sec·South State Street
2
Turn left onto I 94 BL; US 23 BUS
0.4 mi·1 min·East Huron Street
Use the left lane.
3
Turn right onto US 23 BUS
1.2 mi·2 min·North Main Street
4
Take the ramp onto US 23 BUS
0.2 mi·20 sec·US 23 BUS
Toward M 14 East, US 23: Flint, Detroit
5
Merge onto M 14; US 23 BUS
1.1 mi·1 min·M 14; US 23 BUS
6
Keep left at fork onto US 23 BUS
95 mi·1 hr 41 min·US 23 BUS
Toward US 23 North: FlintUse the straight / slight right lanes.
7
Keep slight left at fork onto I 75; US 23
63 mi·1 hr 3 min·I 75; US 23
8
Keep slight left at fork onto I 75
118 mi·2 hr 1 min·I 75
9
Take the exit
0.4 mi·1 min
Exit 344BToward US 2: Manistique, Escanaba
10
Merge onto US 2; I 75 BL
0.7 mi·1 min·US-2 West
11
Continue on US 2
3.2 mi·3 min·US 2
12
Continue on US 2
130 mi·2 hr 33 min·US-2 West
13
Turn right onto South Hill Road
392 ft·10 sec·South Hill Road
14
Continue on Blackwell Avenue
0.2 mi·35 sec·Blackwell Avenue
15
Continue on South Hill Road
0.6 mi·1 min·South Hill Road
16
Continue on 420
3.0 mi·4 min·County 420 21st Road
17
Turn left onto 426
1.0 mi·1 min·County 426 M.5 Road
18
Turn right onto 416
3.5 mi·4 min·County 416 20th Road
19
Arrive at destination
20th Road
Trip Plan
For this 7-hour drive, leaving Ann Arbor in the morning is your best bet to arrive in Flat Rock with ample daylight. You'll have two planned stops, which is a good pace for a drive of this length, allowing for breaks without significantly extending your travel time. Keep an eye on your fuel gauge, especially during the 180.5-mile stretch on I 75, as services might be less frequent in certain sections. The overall fuel cost is estimated at $67, so factor that into your budget.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 2 meaningful breaks for fuel, food, and rest.
The halfway point lands around 210.3 miles from Ann Arbor, MI, or about 3h 41m into the drive.
The longest continuous stretch on this route runs about 180.5 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 93 miles or 1h 42m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 210.3 miles or 3h 41m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 6h 29m
Traffic, exits, and arrival timing usually matter more near Flat Rock, MI than in the middle of the route.
Before You Leave
+
Open the route before leaving Ann Arbor, MI 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.
+
Pick one backup stop option before the midpoint in case traffic changes your pacing.
Day 1
Settle into the route from Ann Arbor, MI
This is one driving day of about 420.7 miles and 7h 43m.
Your first comfortable stop window is around 93 miles from Ann Arbor, MI.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 2 real breaks rather than only quick fuel stops.
The longest stretch is on I 75 for about 180.5 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 0.3 and 278.4 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.3 mi into trip|~0m in|I 94 BL; US 23 BUS / East Huron Street
Turn left onto I 94 BL; US 23 BUS / East Huron Street
Lane positioning matters here
Use the left lane.
4
0.6 mi into trip|~1m in|US 23 BUS / North Main Street
Turn right onto US 23 BUS / North Main Street
Navigation decision point
4
1.9 mi into trip|~4m in|US 23 BUS
Take the ramp onto US 23 BUS toward M 14 East, US 23: Flint, Detroit
Multiple destination signs - pick the right one
Toward M 14 East, US 23: Flint, Detroit
7
3.1 mi into trip|~6m in|US 23 BUS
Keep left at fork onto US 23 BUS toward US 23 North: Flint
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward US 23 North: Flint
6
278.4 mi into trip|~4h 51m in
Take the exit toward US 2: Manistique, Escanaba
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Exit 344B
Toward US 2: Manistique, Escanaba
Fuel & Cost
Regular Gas
$74.42 one way
$148.84 round trip
$4.49/gal25.4 MPG avg147 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.11
$84.60
$169.21
premium
$5.72
$94.66
$189.32
diesel
$6.43
$106.42
$212.83
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$74
Meals
$25–$50
Total
$99–$124
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 147.2 kg one way.
Driving Electric?
About $44 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
126.2
1
$44.17
$20.19
Efficient EV
105.2
1
$36.81
$16.83
EV Truck/SUV
168.3
2
$58.90
$26.92
Gas CO2
147 kg
EV CO2
49 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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 Oct 19, 2026
Origin
Ann Arbor, MI
Afternoon
in Ann Arbor on Tuesday
Local time
1:46 PM
EDT
Current temp
39°F
Clear
WSW 5 mph0% chanceLive forecast
Destination
Flat Rock, MI
Afternoon
in Flat Rock on Tuesday
Local time
1:46 PM
EDT
Current temp
37°F
Mostly Clear
W 5 mph0% chanceLive forecast
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
2 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
7h 43m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
More Details
What kind of drive is this?
This route is predominantly highway, with 97% of the drive on high-speed roads. You'll encounter a long stretch of 180.5 miles on I 75, meaning extended periods of consistent cruising. The transition to surface roads will occur towards the end of your trip, marking the shift from interstate travel to local navigation.
97% 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: 180.5 mi on I 75.
How Hard Is This Drive?
6/10
This is a straightforward highway drive that stays mostly on I 75 and US-2 West. You will hit about 12 points where you need to pay attention to lane position or signs. The trickiest moment comes around 0.3 miles in near I 94 BL; US 23 BUS / East Huron Street.
Driving Effort6/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 420.7 miles you will encounter 12 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 0.3 miles (I 94 BL; US 23 BUS / East Huron Street): Lane positioning matters here; at 0.6 miles (US 23 BUS / North Main Street): Navigation decision point; at 1.9 miles (US 23 BUS): Multiple destination signs - pick the right one.
Elevation Profile
Gently rolling terrain
1,395 ft587 ft
Total Climb
1,068 ft
Total Descent
1,175 ft
Highest Point
1,395 ft
~210.3 mi in
Elevation Range
808 ft
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
On the drive from Ann Arbor, MI to Flat Rock, MI, road signs begin pointing toward Escanaba along the way.
Ann Arbor — often abbreviated as AA or A2 — is a picturesque city surrounding the University of Michigan. It has a strong bent toward the arts, and an attractive and pedestrian-friendly downtown. Visitors enjoy the city's wonderful sidewalk cafe dining, unique shops, lots of bookstores, and abundant cultural opportunities.
Ann Arbor is in Michigan 35 miles (56 km) north of the Ohio border and 45 miles (72 km) west of Detroit, near where the furthest exurban fringes give way to country and small towns. In 2019, the city had a population of about 120,000 people, and thousands of visitors come to town for football games and various festivals.
Top landmarks
•Detroit Observatory — astronomical observatory in Ann Arbor, United States of America
•Kelsey Museum of Archaeology — archaeology museum in Newberry Hall
•Ann Arbor Hands-On Museum — museum in Ann Arbor, Michigan, USA
Doable as a same-day drive at 7h 43m. Total distance: 420.7 miles.
Family Friendly
Moderate complexity with 2 natural rest stops along the way.
Solo Traveler
7h 43m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 180.5 miles on I 75. The full list of main roads is in the Roads section above.
Yes — we found about 33 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 Flat Rock, MI 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 2 meaningful breaks. There are 33 rest areas along the route for bathroom stops.
The main spots that need attention: at 0.3 miles (I 94 BL; US 23 BUS / East Huron Street): Lane positioning matters here; at 0.6 miles (US 23 BUS / North Main Street): Navigation decision point; at 1.9 miles (US 23 BUS): Multiple destination signs - pick the right one.
Not recommended in a single day. At 7.7 hours each way, a round trip means 15.4 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Flat Rock, MI before the return drive.
