Spokane Valley, WA to DuPont, WA is 315 miles and takes about 5 hours 55 minutes via I 90 and I 5, with a fuel budget near $67 and enough daylight to finish in a day. This drive mostly sticks to major interstates, making it a straightforward trip across Washington state. You'll be traveling entirely within the Pacific Coast region, staying on highways for almost the entire distance. It's a practical choice if you need to get from Eastern Washington to the Tacoma area efficiently, with most of your time spent on the interstate.
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
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
157.7 miles from Spokane Valley, WA
A natural place for your longest stop of the day
, about 2h 53m into the drive
.
Main Roads
Road
Distance
Duration
I 90
252 mi
4h 32m
State Route 18
26.7 mi
34m
I 5
22.4 mi
27m
Spokane Valley Freeway
11.3 mi
14m
Barksdale Avenue
0.3 mi
1m
Snoqualmie Parkway
0.3 mi
<1m
North Pines Road
0.2 mi
<1m
Locust Road
<0.1 mi
<1m
Longest stretch:
I 90
— 252 mi, about 4h 32m
Traffic on I-90
Hour-of-day weekday pattern from 126 FHWA count stations on your route.
Peak
3 PM
~1,426 veh/hr typical
· worst 2,032
Quietest
2 AM
~104 veh/hr
Peak-to-quiet ratio
13.7×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 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 Spokane Valley, WA and DuPont, WA.
1
Start on WA 27
0.2 mi·27 sec·North Pines Road
Use the left lane.
2
Turn left onto East Montgomery Avenue
155 ft·6 sec·East Montgomery Avenue
Use the left lane.
3
Take the ramp
0.3 mi·42 sec
4
Merge onto I 90
11 mi·14 min·Spokane Valley Freeway
5
Keep slight left at fork onto I 90; US 395
57 mi·1 hr·I 90; US 395
6
Keep slight left at fork onto I 90
195 mi·3 hr 31 min·I 90
Use the straight / slight right lanes.
7
Take the exit
0.2 mi·30 sec
Exit 25Toward WA 18 West: AuburnUse the slight right lane.
8
Keep slight left at fork
448 ft·13 sec
Toward SR 18 west, Snoqualmie Parkway: Auburn, TacomaUse the straight / left / right lanes.
9
Merge onto WA 18
0.3 mi·25 sec·Snoqualmie Parkway
10
Continue on WA 18
27 mi·34 min·State Route 18
Use the straight / slight right lanes.
11
Take the exit
0.6 mi·1 min
Toward I 5: Seattle, TacomaUse the straight / slight right lanes.
12
Keep slight left at fork
0.6 mi·1 min
Toward I 5 South, WA 161: Enchanted Parkway South, TacomaUse the straight lane.
13
Keep slight left at fork
0.2 mi·31 sec
Toward I 5 South: Tacoma
14
Merge onto I 5
7.2 mi·9 min·I 5
Use the straight / slight right lanes.
15
Keep slight right at fork onto I 5
15 mi·18 min·I 5
Use the straight / slight right lanes.
16
Turn right onto Locust Road
499 ft·15 sec·Locust Road
Use the straight / slight right lanes.
17
Continue on Barksdale Avenue
0.3 mi·1 min·Barksdale Avenue
18
Turn right onto Hercules Street
47 ft·1 sec·Hercules Street
19
Arrive at destination
Hercules Street
Trip Plan
For this 5 hour 55 minute drive, leaving Spokane Valley in the morning should allow you to reach DuPont with ample daylight. Given the 315-mile distance, it's easily a one-day trip, so you have flexibility with your departure time. Keep an eye on your fuel levels, especially during the 252-mile stretch on I 90, as services can be more spread out in certain sections. The fuel cost is estimated at $67, so plan accordingly. You'll want to be mindful of traffic merging onto I 5 as you get closer to your destination.
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 157.7 miles from Spokane Valley, WA, or about 2h 53m into the drive.
The longest continuous stretch on this route runs about 252 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 69 miles or 1h 16m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 157.7 miles or 2h 53m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 42m
Traffic, exits, and arrival timing usually matter more near DuPont, WA than in the middle of the route.
Before You Leave
+
Open the route before leaving Spokane Valley, 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 Spokane Valley, WA
This is one driving day of about 315.4 miles and 5h 55m.
Your first comfortable stop window is around 69 miles from Spokane Valley, 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 252 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 14
5 decision points cluster between mile 0.2 and 291.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
7
0.2 mi into trip|~0m in|East Montgomery Avenue
Turn left onto East Montgomery Avenue
Lane positioning matters here
Use the left lane.
7
263.8 mi into trip|~4h 48m 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
264 mi into trip|~4h 48m 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
291.2 mi into trip|~5h 23m in
Take the exit toward I 5: Seattle, Tacoma
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward I 5: Seattle, Tacoma
8
291.7 mi into trip|~5h 24m in
Keep slight left at fork toward I 5 South, WA 161: Enchanted Parkway South, Tacoma
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight lane.
Toward I 5 South, WA 161: Enchanted Parkway Sou...
Fuel & Cost
Regular Gas
$61.44 one way
$122.88 round trip
$4.95/gal25.4 MPG avg110 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.18
$64.37
$128.74
premium
$5.39
$66.94
$133.88
diesel
$4.80
$59.55
$119.11
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$61
Meals
$25–$50
Total
$86–$111
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 110.4 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $33 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
94.6
1
$33.12
$15.14
Efficient EV
78.9
0
$27.60
$12.62
EV Truck/SUV
126.2
1
$44.16
$20.19
Gas CO2
110 kg
EV CO2
37 kg (66% 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 Jul 17, 2026
Origin
Spokane Valley, WA
Evening
in Spokane Valley on Monday
Local time
7:06 PM
PDT
Current temp
93°F
Areas Of Smoke
SW 6 mph16% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 6:55AM PDT until July 17 at 11:00AM PDT by NWS Spokane WA
Red Flag Warning
Red Flag Warning issued July 17 at 6:55AM PDT until July 17 at 9:00PM PDT by NWS Spokane WA
Destination
DuPont, WA
Evening
in DuPont on Monday
Local time
7:06 PM
PDT
Current temp
74°F
Mostly Sunny
WSW 8 mph0% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 6:55AM PDT until July 17 at 11:00AM PDT by NWS Spokane WA
Red Flag Warning
Red Flag Warning issued July 17 at 6:55AM PDT until July 17 at 9:00PM PDT by NWS Spokane WA
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
19 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
5h 55m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
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...
20 mi from route
~50 min detour
Free
near mile 271.9
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This trip is almost entirely highway driving, with 99% of the 315 miles on major roads like I 90 and I 5. You'll encounter a long stretch of 252 miles on I 90 before transitioning to State Route 18 and then I 5. Expect plenty of exits and merging traffic as you navigate between these interstates, especially as you approach the Puget Sound area.
99% 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: 252 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 0.2 miles in near East Montgomery Avenue.
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 14 significant decision points across 315.4 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 0.2 miles (East Montgomery Avenue): Lane positioning matters here; at 263.8 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 264 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Gently rolling terrain
2,456 ft249 ft
Total Climb
1,871 ft
Total Descent
3,635 ft
Highest Point
2,456 ft
~225.3 mi in
Elevation Range
2,206 ft
Notable High Points
2,456 ft at ~225.3 miles+547 ft prominence
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Spokane Valley, WA and DuPont, WA, road signs point toward Snoqualmie Parkway: Auburn and Tacoma.
Spokane is the second-largest city in Washington State, and the largest between Seattle and Minneapolis. It is the economic hub of the "Inland Empire", a name used for Eastern Washington and the Idaho Panhandle (pre-dating by nearly a century the use of the same title by a region in Southern California). It is at the north edge of the Palouse, where gently rolling hills of wheat fields end at the Spokane River valley.
This article also includes the suburbs of Liberty Lake and Spokane Valley.
Doable as a same-day drive at 5h 55m. Total distance: 315.4 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 55m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (99%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 252 miles on I 90. The full list of main roads is in the Roads section above.
Yes — we found about 23 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 DuPont, 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. There are 23 rest areas along the route for bathroom stops.
The main spots that need attention: at 0.2 miles (East Montgomery Avenue): Lane positioning matters here; at 263.8 miles: Exit ramp - move to the correct lane early. Lane positioning matters here; at 264 miles: Highway fork - watch signs carefully. 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.
Not recommended in a single day. At 5.9 hours each way, a round trip means 11.9 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at DuPont, WA before the return drive.
