How far is Federal Way, WA from Mill Plain, WA?
The driving distance from Federal Way, WA to Mill Plain, WA is about 148.8 miles (239.5 km), with a travel time of about 02h 59m by car.
- The straight-line flight distance is about 116.4 miles (187.3 km).
- For a round trip, plan for roughly 05h 58m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM PDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 59m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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 Lewis County, Washington, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Partly Cloudy
Mostly Clear
Driving Route Map
The map below follows the saved road route between Federal Way and Mill Plain.
Turn-by-Turn Driving Directions
Step-by-step road directions between Federal Way and Mill Plain.
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1
Start on the route
7 m · 7 sec
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2
Turn left onto South 312th Street
48 m · 6 sec · South 312th Street
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3
Turn left onto Pacific Highway South
1.8 mi · 3 min · Pacific Highway South
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4
Turn left onto 16th Avenue South
2572 ft · 1 min · 16th Avenue South
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5
Turn left onto State Route 18
152 m · 14 sec · State Route 18
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6
Take the exit slight right toward I 5 North, I 5 South: Seattle, Tacoma
633 ft · 16 sec
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7
Keep slight right to continue on I 5 South: Tacoma
1763 ft · 45 sec
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8
Merge slight left
7.5 mi · 9 min
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9
Keep slight right
126.2 mi · 2 hr 23 min
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10
Keep slight right to continue on I 205 South: Salem
4.2 mi · 6 min
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11
Take the exit slight right toward Padden Parkway, Northeast Andresen Road
1573 ft · 42 sec
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12
Turn left onto Northeast Padden Parkway
4 mi · 6 min · Northeast Padden Parkway
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13
Turn right onto Northeast 152nd Avenue
1201 ft · 31 sec · Northeast 152nd Avenue
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14
Continue on Northeast 78th Street
2568 ft · 1 min · Northeast 78th Street
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15
Turn right onto Northeast 162nd Avenue
2 mi · 4 min · Northeast 162nd Avenue
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16
Turn left onto Northeast 39th Street
2676 ft · 1 min · Northeast 39th Street
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17
Turn right onto Northeast 172nd Avenue
2266 ft · 1 min · Northeast 172nd Avenue
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18
Turn left onto Northeast 29th Street
61 m · 11 sec · Northeast 29th Street
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19
Turn right onto Northeast 173rd Court
104 m · 15 sec · Northeast 173rd Court
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20
Turn slight left
67 m · 16 sec
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21
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Federal Way and Mill Plain.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 5 South
Keep slight right
126 mi · 02h 23m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Partly Cloudy leaving Federal Way and Mostly Clear near Mill Plain.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Federal Way to Mill Plain?
The road trip is about 148.8 miles (239.5 km) and usually takes 02h 59m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Napavine is a useful midpoint, sitting about 74.4 miles from Federal Way and 74.4 miles from Mill Plain.
How much longer is the road route than the straight-line distance?
The direct path is about 116.4 miles (187.3 km), while the road route adds roughly 32.4 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 8:00 AM to 10:00 AM PDT. If you want a more comfortable same-day return, try to leave by 12:32 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $27.47 one way or $54.95 round trip. Estimated CO2 is about 46.7 kg one way.
What should you check before leaving?
Before you leave, expect Partly Cloudy around Federal Way and Mostly Clear near Mill Plain.
Stop Ideas Near Napavine
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 Napavine.
Centralia station
Centennial Station
Kelso Multimodal Transportation Center
Astoria Transit Center
Flight Path Map
This map shows the direct air route between Federal Way and Mill Plain. Straight-line distance: 116.36 mi (187.26 km).
#1 Federal Way
A city in King County, Washington.
| Population | 96,307 |
| Coordinates | 47.3223200, -122.3126200 |
| Altitude | 141 |
| Country | United States |
#2 Mill Plain
Census designated place
| Population | 7,874 |
| Coordinates | 45.6429000, -122.4939800 |
| Altitude | 84 |
| Country | United States |
End: Mill Plain (-122.49398, 45.6429)
Estimated Travel Time
Distance: 240 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 57m |
| 40 mph (64.37 km/h) | 03h 43m |
| 50 mph (80.47 km/h) | 02h 58m |
| 60 mph (96.56 km/h) | 02h 28m |
| 70 mph (112.65 km/h) | 02h 07m |
| 80 mph (129 km/h) | 01h 51m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.23 | $27.47 | $54.95 |
| Mid-grade | $5.57 | $29.23 | $58.45 |
| Premium | $5.77 | $30.30 | $60.60 |
| Diesel | $5.47 | $28.70 | $57.40 |
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 Washington · Apr 30, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.