This 150-mile drive from Federal Way, WA to Sunnyslope, WA will take you about 3 hours and 7 minutes to complete. It's a straightforward, highway-focused journey that's perfectly suited for a single-day trip, with an estimated fuel cost of $31. You'll primarily be on I-90, US-97, and State Route 18, making for a predominantly high-speed experience. The route stays within Washington state, connecting you across the Pacific Coast region. Plan for one main stop along the way to break up the drive.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
75 miles from Federal Way, WA
A natural place for your longest stop of the day
, about 1h 32m into the drive
.
Main Roads
Road
Distance
Duration
I 90
59.8 mi
1h 6m
US 97
35.2 mi
44m
State Route 18
24.4 mi
31m
US 2
14.8 mi
19m
WA 970
9.9 mi
12m
South Peasley Canyon Road
1.8 mi
3m
South 320th Street
1.4 mi
3m
Pacific Highway South
0.5 mi
1m
Longest stretch:
I 90
— 59.8 mi, about 1h 6m
Turn-by-Turn Driving Directions
Step-by-step road directions between Federal Way, WA and Sunnyslope, WA.
1
Start on this road
24 ft·7 sec·this road
2
Turn left onto South 312th Street
158 ft·5 sec·South 312th Street
3
Turn left onto WA 99
0.5 mi·1 min·Pacific Highway South
4
Turn left onto South 320th Street
1.4 mi·3 min·South 320th Street
Use the straight lane.
5
Continue on South Peasley Canyon Road
1.0 mi·1 min·South Peasley Canyon Road
6
Enter roundabout onto South Peasley Canyon Road
95 ft·1 sec·South Peasley Canyon Road
7
Continue on South Peasley Canyon Road
0.7 mi·1 min·South Peasley Canyon Road
8
Turn left onto West Valley Highway North
334 ft·10 sec·West Valley Highway North
Use the left lane.
9
Take the ramp
0.2 mi·28 sec
Toward WA 18 East, WA 167 North: Renton, North BendUse the right lane.
10
Keep slight left at fork
0.2 mi·30 sec
Toward WA 18 East
11
Merge onto WA 18
24 mi·31 min·State Route 18
Use the straight / slight right lanes.
12
Continue on WA 18
0.1 mi·8 sec·Snoqualmie Parkway
13
Take the exit
0.6 mi·1 min
Toward I 90 East: Spokane
14
Merge onto I 90
60 mi·1 hr 6 min·I 90
Use the straight / slight right lanes.
15
Take the exit
0.2 mi·32 sec
Toward Cle Elum, Leavenworth
16
Turn left onto WA 970
0.4 mi·33 sec·Sunset Highway
17
At end of road, turn right onto WA 970
0.1 mi·10 sec·WA 970
18
Take the exit onto WA 970
9.8 mi·12 min·WA 970
19
Continue on US 97
35 mi·44 min·US 97
20
Take the exit onto US 97
15 mi·19 min·US 2
21
Enter roundabout onto Easy Street
225 ft·9 sec·Easy Street
22
Continue on Easy Street
0.2 mi·33 sec·Easy Street
23
Arrive at destination
Easy Street
Trip Plan
For this manageable 3-hour drive, you have the flexibility to leave whenever suits your schedule. Consider an early morning departure to maximize your day at your destination or avoid any potential mid-day traffic. With only 150 miles and an estimated fuel cost of $31, you won't need to worry extensively about frequent refueling, but it's always wise to top off before leaving Federal Way. Keep an eye on your fuel gauge as you approach Sunnyslope, as services can become less frequent on some stretches of US-97.
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 75 miles from Federal Way, WA, or about 1h 32m into the drive.
The longest continuous stretch on this route runs about 59.8 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 33 miles or 45m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 75 miles or 1h 32m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 31m
Traffic, exits, and arrival timing usually matter more near Sunnyslope, WA than in the middle of the route.
Before You Leave
+
Open the route before leaving Federal Way, WA 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 Federal Way, WA
This is one driving day of about 150 miles and 3h 7m.
Your first comfortable stop window is around 33 miles from Federal Way, WA.
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 90 for about 59.8 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 16
5 decision points cluster between mile 0 and 4.3 — 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|South 312th Street
Turn left onto South 312th Street
Navigation decision point
5
3.7 mi into trip|~7m in|West Valley Highway North
Turn left onto West Valley Highway North
Lane positioning matters here
Use the left lane.
8
3.8 mi into trip|~8m in
Take the ramp toward WA 18 East, WA 167 North: Renton, North Bend
Lane positioning matters here. Multiple destination signs - pick the right one
Use the right lane.
Toward WA 18 East, WA 167 North: Renton, North...
6
4 mi into trip|~8m in
Keep slight left at fork toward WA 18 East
Highway fork - watch signs carefully
Toward WA 18 East
5
4.3 mi into trip|~9m in|WA 18 / State Route 18
Merge onto WA 18 / State Route 18
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
Fuel & Cost
Regular Gas
$31.39 one way
$62.79 round trip
$5.32/gal25.4 MPG avg53 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.58
$32.92
$65.85
premium
$5.77
$34.06
$68.13
diesel
$5.61
$33.12
$66.24
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$31
Meals
$25–$50
Total
$56–$81
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 52.5 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $16 in charging
· 0 stops
· 65% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
45
0
$15.75
$7.20
Efficient EV
37.5
0
$13.13
$6.00
EV Truck/SUV
60
0
$21.00
$9.60
Gas CO2
52 kg
EV CO2
18 kg (65% 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 15, 2026
Origin
Federal Way, WA
Morning
in Federal Way on Sunday
Local time
7:51 AM
PDT
Current temp
47°F
Unavailable
Live forecast
Destination
Sunnyslope, WA
Morning
in Sunnyslope on Sunday
Local time
7:51 AM
PDT
Current temp
43°F
Unavailable
Live 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
4 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
3h 7m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
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.
Klondike Gold Rush - Seattle Unit National Historical Park
National Historical Park
Seattle flourished during and after the Klondike Gold Rush. Merchants supplied people from around the world passing through this port city on their way to a remarkable adventure in the Yukon Territory...
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
Expect a highway-centric experience for 96% of this 150-mile route. You'll find yourself on stretches of I-90 for up to 59.8 miles at a time, allowing for consistent speed. While the profile is highway-focused, the transition onto US-97 and State Route 18 may offer subtle shifts in the surrounding landscape. The journey is designed for efficient travel, minimizing time spent on slower, more winding roads.
96% highway — fuel and pacing are the main things to plan.
23 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 59.8 mi on I 90.
How Hard Is This Drive?
6/10
This is a straightforward highway drive that stays mostly on I 90 and US 97. You will hit about 16 points where you need to pay attention to lane position or signs. The trickiest moment comes early in the drive near South 312th 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 150 miles you will encounter 16 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: near the start (South 312th Street): Navigation decision point; at 3.7 miles (West Valley Highway North): Lane positioning matters here; at 3.8 miles: Lane positioning matters here. Multiple destination signs - pick the right one.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Federal Way, WA and Sunnyslope, WA, road signs point toward Cle Elum and Leavenworth.
Federal Way is a city in King County on the Puget Sound of Washington State. It is the home of the Pacific Bonsai Museum and Rhododendron Species Botanical Gardens. With a population of 96,000 (2016), Federal Way is one of Seattle's largest suburbs.
Doable as a same-day drive at 3h 7m. Total distance: 150 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
3h 7m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (96%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 59.8 miles on I 90. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
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 Sunnyslope, WA 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. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: near the start (South 312th Street): Navigation decision point; at 3.7 miles (West Valley Highway North): Lane positioning matters here; at 3.8 miles: Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Klondike Gold Rush - Seattle Unit National Historical Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 3.1 hours each way, an in-and-out day trip would put you behind the wheel for 6.2 hours — manageable with a long break at Sunnyslope, WA, but most travelers stay overnight.
