How far is Flint, MI from Union, MI?
The driving distance from Flint, MI to Union, MI is about 172.6 miles (277.7 km), with a travel time of about 03h 11m by car.
- The straight-line flight distance is about 139.8 miles (225 km).
- For a round trip, plan for roughly 06h 22m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM EST.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 03h 11m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Michigan, United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Light Rain
Scattered Rain Showers
Driving Route Map
The map below follows the saved road route between Flint and Union.
Turn-by-Turn Driving Directions
Step-by-step road directions between Flint and Union.
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1
Start on the route
28 m · 11 sec
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2
Turn uturn onto East Court Street
1463 ft · 47 sec · East Court Street
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3
Turn left onto South Grand Traverse Street
1772 ft · 41 sec · South Grand Traverse Street
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4
Take the ramp right
1102 ft · 27 sec
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5
Merge slight left onto Chevrolet-Buick Freeway
46 mi · 47 min · Chevrolet-Buick Freeway
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6
Take the exit slight right toward US 127: Clare, Lansing
2079 ft · 25 sec
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7
Keep slight left
3256 ft · 40 sec
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8
Keep slight left
1 km · 40 sec
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9
Merge slight left
14.4 mi · 15 min
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10
Keep slight right to continue on I 69 South: Charlotte, Fort Wayne
34.4 mi · 37 min
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11
Take the exit slight right toward I 94: Chicago, Detroit
839 ft · 20 sec
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12
Keep slight right to continue on I 94 West: Chicago
34.8 mi · 38 min
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13
Take the exit slight right toward US 131 South: Three Rivers
1370 ft · 47 sec
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14
Merge slight left onto US-131
25.8 mi · 29 min · US-131
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15
Continue on Constantine Bypass
3.1 mi · 4 min · Constantine Bypass
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16
Turn right onto Riverside Drive
4.6 mi · 6 min · Riverside Drive
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17
Turn right onto West Chicago Road
1113 ft · 28 sec · West Chicago Road
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18
Continue on West Chicago Road
1444 ft · 22 sec · West Chicago Road
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19
Continue on US-12
6.1 mi · 8 min · US-12
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20
Arrive at your destination
0 m · 1 sec · US-12
Car Route Details
A richer read on the saved driving route between Flint and Union.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Chevrolet-Buick Freeway
Merge slight left onto Chevrolet-Buick Freeway
46 mi · 00h 47m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Slight Chance Light Rain leaving Flint and Scattered Rain Showers near Union.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Flint to Union?
The road trip is about 172.6 miles (277.7 km) and usually takes 03h 11m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Olivet is a useful midpoint, sitting about 86.2 miles from Flint and 86.4 miles from Union.
How much longer is the road route than the straight-line distance?
The direct path is about 139.8 miles (225 km), while the road route adds roughly 32.8 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM EST. If you want a more comfortable same-day return, try to leave by 10:38 AM EST.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $26.82 one way or $53.64 round trip. Estimated CO2 is about 54.1 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Light Rain around Flint and Scattered Rain Showers near Union.
Stop Ideas Near Olivet
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Olivet.
Albion station
Battle Creek Transportation Center
East Lansing station
Jackson station
Flight Path Map
This map shows the direct air route between Flint and Union. Straight-line distance: 139.83 mi (225.04 km).
#1 Flint
The largest city in Genesee County, Michigan.
| Population | 94,968 |
| Coordinates | 43.0125300, -83.6874600 |
| Altitude | 229 |
| Country | United States |
#2 Union
Township in Cass County, Michigan
| Population | 440 |
| Coordinates | 41.7861600, -85.8677800 |
| Altitude | 248 |
| Country | United States |
End: Union (-85.86778, 41.78616)
Estimated Travel Time
Distance: 278 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 05h 45m |
| 40 mph (64.37 km/h) | 04h 18m |
| 50 mph (80.47 km/h) | 03h 27m |
| 60 mph (96.56 km/h) | 02h 52m |
| 70 mph (112.65 km/h) | 02h 27m |
| 80 mph (129 km/h) | 02h 09m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.40 | $26.82 | $53.64 |
| Mid-grade | $5.08 | $30.94 | $61.87 |
| Premium | $5.68 | $34.60 | $69.19 |
| Diesel | $6.63 | $40.36 | $80.73 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Michigan · Nov 05, 2026