Traveling from Ephrata to Federal Way covers 175.5 miles and typically takes about 3 hours and 26 minutes behind the wheel. Because this journey is easily manageable in a single day, you won't need to worry about overnight lodging. You will rely primarily on I-90 and State Route 18 to complete the trip, with a small portion utilizing Basin Street Southwest. Budgeting roughly $37 for fuel should keep you covered for the entire drive. It is a straightforward, highway-focused route that efficiently connects the interior of Washington to the coast, making it a practical choice for travelers seeking a quick transit between these two points.
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
87.8 miles from Ephrata, WA
A natural place for your longest stop of the day
, about 1h 41m into the drive
.
Main Roads
Road
Distance
Duration
I 90
125.7 mi
2h 17m
State Route 18
24.2 mi
31m
Basin Street Southwest
20.1 mi
27m
South Peasley Canyon Road
1.8 mi
3m
South 320th Street
1.4 mi
3m
Pacific Highway South
0.5 mi
<1m
Snoqualmie Parkway
0.3 mi
<1m
West Valley Highway North
0.1 mi
<1m
Longest stretch:
I 90
— 125.7 mi, about 2h 17m
Turn-by-Turn Driving Directions
Step-by-step road directions between Ephrata, WA and Federal Way, WA.
1
Start on 3rd Avenue Southwest
43 ft·6 sec·3rd Avenue Southwest
2
Turn left onto WA 28
20 mi·27 min·Basin Street Southwest
3
Take the ramp
0.3 mi·44 sec
Toward I 90 West: Seattle
4
Merge onto I 90
126 mi·2 hr 17 min·I 90
Use the straight / slight right lanes.
5
Take the exit
0.2 mi·30 sec
Exit 25Toward WA 18 West: AuburnUse the slight right lane.
6
Keep slight left at fork
448 ft·13 sec
Toward SR 18 west, Snoqualmie Parkway: Auburn, TacomaUse the straight / left / right lanes.
7
Merge onto WA 18
0.3 mi·25 sec·Snoqualmie Parkway
8
Continue on WA 18
24 mi·31 min·State Route 18
Use the straight / slight right lanes.
9
Take the exit
0.2 mi·19 sec
Toward WA 167: Renton, PuyallupUse the slight right lane.
10
Keep slight left at fork
0.3 mi·26 sec
Toward WA 167 South: Puyallup, West Valley HighwayUse the straight / slight right lanes.
11
Keep slight left at fork
0.1 mi·24 sec
Toward West Valley HighwayUse the straight / right lanes.
12
At end of road, turn left onto West Valley Highway North
0.1 mi·20 sec·West Valley Highway North
Use the straight lane.
13
Turn right onto South Peasley Canyon Road
0.7 mi·1 min·South Peasley Canyon Road
Use the straight / right lanes.
14
Enter roundabout onto South Peasley Canyon Road
67 ft·1 sec·South Peasley Canyon Road
15
Continue on South Peasley Canyon Road
1.0 mi·1 min·South Peasley Canyon Road
Use the left lane.
16
Continue on South 320th Street
1.4 mi·3 min·South 320th Street
17
Turn right onto WA 99
0.5 mi·55 sec·Pacific Highway South
18
Turn right onto South 312th Street
158 ft·5 sec·South 312th Street
Use the right lane.
19
Turn right
24 ft·1 sec
20
Arrive at destination
Trip Plan
To ensure a smooth trip, aim to depart early to account for potential traffic as you approach the Federal Way area. Since this 3-hour and 26-minute drive is relatively short, you only need to plan for one strategic stop to stretch your legs and refresh. Keep a close eye on your fuel gauge before merging onto the longest 125.7-mile stretch of I-90, as refueling options can be spaced out. Use your single planned stop as a mid-way break to reset before tackling the final transition onto State Route 18. This schedule offers you plenty of flexibility, allowing you to reach your destination without feeling rushed or fatigued.
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 87.8 miles from Ephrata, WA, or about 1h 41m into the drive.
The longest continuous stretch on this route runs about 125.7 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 39 miles or 48m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 87.8 miles or 1h 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 2h 42m
Traffic, exits, and arrival timing usually matter more near Federal Way, WA than in the middle of the route.
Before You Leave
+
Open the route before leaving Ephrata, 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 Ephrata, WA
This is one driving day of about 175.5 miles and 3h 26m.
Your first comfortable stop window is around 39 miles from Ephrata, 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 125.7 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 146.2 and 171.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
146.2 mi into trip|~2h 45m in
Take the exit toward WA 18 West: Auburn
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 25
Toward WA 18 West: Auburn
9
146.4 mi into trip|~2h 45m in
Keep slight left at fork toward SR 18 west, Snoqualmie Parkway: Auburn, Tacoma
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / left / right lanes.
Toward SR 18 west, Snoqualmie Parkway: Auburn,...
7
171 mi into trip|~3h 17m in
Take the exit toward WA 167: Renton, Puyallup
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward WA 167: Renton, Puyallup
9
171.3 mi into trip|~3h 17m in
Keep slight left at fork toward WA 167 South: Puyallup, West Valley Highway
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward WA 167 South: Puyallup, West Valley High...
8
171.5 mi into trip|~3h 18m in
Keep slight left at fork toward West Valley Highway
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / right lanes.
Toward West Valley Highway
Fuel & Cost
Regular Gas
$36.73 one way
$73.46 round trip
$5.32/gal25.4 MPG avg61 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.58
$38.52
$77.04
premium
$5.77
$39.85
$79.71
diesel
$5.61
$38.75
$77.50
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$37
Meals
$25–$50
Total
$62–$87
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 61.4 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $18 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
52.7
0
$18.43
$8.42
Efficient EV
43.9
0
$15.36
$7.02
EV Truck/SUV
70.2
0
$24.57
$11.23
Gas CO2
61 kg
EV CO2
21 kg (66% 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
Ephrata, WA
Late night
in Ephrata on Sunday
Local time
3:33 AM
PDT
Current temp
49°F
Unavailable
Live forecast
Destination
Federal Way, WA
Late night
in Federal Way on Sunday
Local time
3:33 AM
PDT
Current temp
47°F
Unavailable
Live forecast
51°F
North Bend, WA
88 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
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
3h 26m 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.
More Details
What kind of drive is this?
Expect a drive defined by high-speed efficiency, as roughly 86% of your route takes place on major highways. You will settle into a rhythm quickly, especially during the longest stretch of 125.7 miles spent cruising along I-90. While the interstate provides a consistent, high-speed experience, the character of the road shifts as you transition onto the state highway system toward the end of your trip. The overall profile is distinctly highway-focused, prioritizing speed and directness over winding, secondary backroads. Staying alert during these long interstate sections is essential, as the monotony of the open road can be just as demanding as technical driving.
86% highway — fuel and pacing are the main things to plan.
20 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 125.7 mi on I 90.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on I 90 and State Route 18. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 146.2 miles in.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 16 significant decision points across 175.5 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: at 146.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 146.4 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 171 miles: Exit ramp - move to the correct lane early. 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 Ephrata, WA and Federal Way, WA, road signs point toward Snoqualmie Parkway: Auburn and Tacoma.
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 26m. Total distance: 175.5 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
3h 26m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (86%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 125.7 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 Federal Way, 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: at 146.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 146.4 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 171 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Possible but tiring. At 3.4 hours each way, an in-and-out day trip would put you behind the wheel for 6.9 hours — manageable with a long break at Federal Way, WA, but most travelers stay overnight.
