Origin
Cosmopolis, WA
Morning in Cosmopolis on Sunday
Local time
7:17 AM
PDT
Current temp
46°F
Unavailable
Live forecast
Trip from Cosmopolis, WA to Seattle, WA
Compiled and reviewed by the US Trip Planner planning team at COD Solutions Oy · Last reviewed Apr 19, 2026 · Editorial standards
Drive Time
2h 26m
Distance
110.8 mi
178 km
Drive Score
8/10
Great drive
Same Day?
Yes, doable
Fuel Cost
$23
one way
EV Charging
Unknown
Best Time to Leave
4 AM
2h 16m
★
6 AM
2h 26m
8 AM
2h 46m
10 AM
2h 33m
12 PM
2h 31m
3 PM
2h 34m
5 PM
2h 45m
8 PM
2h 20m
Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.
Cosmopolis, WA
Boris Hamer
Seattle, WA
Wikimedia Commons
Trip Overview
This 110.8-mile drive from Cosmopolis, WA to Seattle, WA is a manageable one-day trip, taking approximately 2 hours and 26 minutes. Primarily utilizing I-5 and WA 8, with a portion on Olympic Highway, this route offers a highway-focused experience. With an estimated fuel cost of $23, it's an economical option for a quick journey. The drive efficiently connects you from the Pacific Coast region to another coastal area, making it a straightforward transition. Given its relatively short duration and highway nature, it’s well-suited for a single day of travel without needing an overnight stop.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Midpoint
55.4 miles from Cosmopolis, WA
A natural place for your longest stop of the day , about 1h 16m into the drive .
Main Roads
| Road | Distance | Duration |
|---|---|---|
| I 5 | 60.8 mi | 1h 15m |
| WA 8 | 21.1 mi | 26m |
| Olympic Highway | 10.1 mi | 12m |
| State Route 107 | 7 mi | 12m |
| US 101 | 5.4 mi | 7m |
| 1st Street | 4.1 mi | 6m |
| South Main Street | 0.8 mi | 1m |
| F Street | 0.1 mi | <1m |
Longest stretch:
I 5
— 60.8 mi, about 1h 15m
Turn-by-Turn Driving Directions
Step-by-step road directions between Cosmopolis, WA and Seattle, WA.
1
Start on 3rd Street
21 ft
·
2 sec
·
3rd Street
2
Turn right onto F Street
0.1 mi
·
27 sec
·
F Street
3
Turn right onto US 101
4.1 mi
·
6 min
·
1st Street
Use the left lane.
4
Turn left onto WA 107
7.0 mi
·
12 min
·
State Route 107
Use the left lane.
5
Continue on WA 107
0.8 mi
·
1 min
·
South Main Street
6
Take the ramp
0.4 mi
·
52 sec
7
Merge onto US 12
10 mi
·
12 min
·
Olympic Highway
8
Continue on WA 8
21 mi
·
26 min
·
WA 8
9
Merge onto US 101
5.4 mi
·
7 min
·
US 101
10
Keep slight left at fork
0.5 mi
·
52 sec
11
Merge onto I 5
29 mi
·
36 min
·
I 5
Use the straight / slight right lanes.
12
Keep slight right at fork onto I 5
32 mi
·
39 min
·
I 5
Use the slight right lane.
13
Take the exit
0.3 mi
·
35 sec
Exit 165
Toward Seneca Street
Use the slight left lane.
14
Turn left onto Seneca Street
323 ft
·
18 sec
·
Seneca Street
15
Turn left onto 5th Avenue
0.1 mi
·
27 sec
·
5th Avenue
Use the straight / left lanes.
16
Turn right onto Madison Street
113 ft
·
9 sec
·
Madison Street
17
Turn left
31 ft
·
2 sec
18
Arrive at destination
Trip Plan
For this 2 hour and 26 minute drive, consider an early morning departure from Cosmopolis to maximize your time in Seattle and potentially avoid some traffic. The 110.8-mile distance doesn't necessitate many stops, but there are ample opportunities along I-5 for fuel and rest if needed. Keep an eye on your fuel gauge, especially before beginning the 60.8-mile stretch on I-5, as services can be more spread out on the interstate. This short trip offers flexibility, allowing you to easily adjust your schedule based on your needs.
Morning Departure
Leave by 9 AM and you'll arrive before lunch.
Evening Departure
Even a 4 PM departure gets you there before dark in summer.
You can normally do this drive in one day.
You may only need one short stretch break if traffic stays light.
The halfway point lands around 55.4 miles from Cosmopolis, WA, or about 1h 16m into the drive.
The longest continuous stretch on this route runs about 60.8 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 24 miles or 36m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 55.4 miles or 1h 16m 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
Traffic, exits, and arrival timing usually matter more near Seattle, WA than in the middle of the route.
Before You Leave
+
Open the route before leaving Cosmopolis, 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 Cosmopolis, WA
This is one driving day of about 110.8 miles and 2h 26m.
Your first comfortable stop window is around 24 miles from Cosmopolis, WA.
This route can stay practical as a one-day drive if traffic stays reasonable.
The longest stretch is on I 5 for about 60.8 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Mid-route town
Meal stop
55 mi into the route
Best for: Lunch, fuel, and a longer reset
This sits close to the middle of the route, so it works well for the longest stop of the day.
Pacing Suggestions
Fuel and coffee
A short stop after about 24 miles helps settle the day before fatigue starts building.
Meal break
The midpoint is around 55.4 miles from Cosmopolis, WA, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel checkTop up before I 5 if your tank is already low. That segment runs about 60.8 miles.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
Heads-up: tricky spots
5 of 145 decision points cluster between mile 0.1 and 110.6 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
0.1 mi into trip
|
~0m in
|
US 101 / 1st Street
Turn right onto US 101 / 1st Street
Lane positioning matters here
Use the left lane.
6
4.2 mi into trip
|
~7m in
|
WA 107 / State Route 107
Turn left onto WA 107 / State Route 107
Lane positioning matters here
Use the left lane.
6
78.3 mi into trip
|
~1h 44m in
|
I 5
Keep slight right at fork onto I 5
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
7
110.3 mi into trip
|
~2h 24m in
Take the exit toward Seneca Street
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight left lane.
Exit 165
Toward Seneca Street
7
110.6 mi into trip
|
~2h 25m in
|
5th Avenue
Turn left onto 5th Avenue
Lane positioning matters here
Use the straight / left lanes.
Fuel & Cost
Regular Gas
$23.19 one way
$46.38 round trip
$5.32/gal
25.4 MPG avg
39 kg CO2
| Fuel Type | $/gal | One Way | Round Trip |
|---|---|---|---|
| midgrade | $5.58 | $24.32 | $48.64 |
| premium | $5.77 | $25.16 | $50.32 |
| diesel | $5.61 | $24.46 | $48.93 |
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$23
Meals
$25–$50
Total
$48–$73
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 38.8 kg one way. Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $12 in charging · 0 stops · 67% less CO2
| Vehicle Type | kWh | Stops | DC Fast | Home Charge |
|---|---|---|---|---|
| Average EV | 33.2 | 0 | $11.63 | $5.32 |
| Efficient EV | 27.7 | 0 | $9.69 | $4.43 |
| EV Truck/SUV | 44.3 | 0 | $15.51 | $7.09 |
Gas CO2
39 kg
EV CO2
13 kg (67% 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.
Destination
Seattle, WA
Morning in Seattle on Sunday
Local time
7:17 AM
PDT
Current temp
49°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
3 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
2h 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.
What kind of drive is this?
Expect a drive that is predominantly highway, with 85% of the journey on faster roads. You'll encounter an 60.8-mile stretch on I-5, which forms the longest uninterrupted segment. The route transitions from WA 8 to Olympic Highway before merging onto I-5, offering a mix of state routes and the main interstate. While largely focused on efficient travel, the initial sections may offer glimpses of the surrounding landscape before the interstate dominates.
85% highway — fuel and pacing are the main things to plan.
18 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 60.8 mi on I 5.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on I 5 and WA 8. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.1 miles in near US 101 / 1st Street.
Driving Effort
8/10
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 110.8 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 0.1 miles (US 101 / 1st Street): Lane positioning matters here; at 4.2 miles (WA 107 / State Route 107): Lane positioning matters here; at 78.3 miles (I 5): Highway fork - watch signs carefully. Lane positioning matters here.
About the Cities
Arriving in Seattle, WA
Full guide →Seattle, Washington sits at one of the most beautiful spots in the United States. Occupying a narrow isthmus between the Puget Sound and Lake Washington, it is the biggest city in the Pacific Northwest, with 780,000 people in Seattle and over four million people in the metro area. Seen from above, carpets of evergreen trees, pristine blue waters, and snowy white mountains surround the downtown's metallic skyscrapers, earning the city its nickname The Emerald City. On the ground, you will find a vibrant and cosmopolitan city. Next to the progressive downtown and the freewheeling feel of Capitol Hill, you can find a laid-back atmosphere in the districts to the north and ethnically diverse neighborhoods to the south.
City content from Wikivoyage (CC BY-SA 4.0) and Wikidata (CC0).
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 2h 26m. Total distance: 110.8 miles.
Family Friendly
Moderate complexity with 0 natural rest stops along the way.
Solo Traveler
2h 26m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (85%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 60.8 miles on I 5. The full list of main roads is in the Roads section above.
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 Seattle, 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. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 0.1 miles (US 101 / 1st Street): Lane positioning matters here; at 4.2 miles (WA 107 / State Route 107): Lane positioning matters here; at 78.3 miles (I 5): Highway fork - watch signs carefully. Lane positioning matters here.
Yes. A round trip is manageable in a single day if you plan a break at Seattle, WA before heading back.
How this page is built
Compiled by the US Trip Planner planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, and EIA for fuel prices. See our methodology for refresh cadence and limitations.
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