Trip from Cosmopolis, WA to Federal Way, WA

Drive Time

2h 1m

Distance

90.1 mi

145 km

Drive Score

8/10

Great drive

Same Day?

Yes, doable

Fuel Cost

$19

one way

EV Charging

None

0 DC fast

Best Time to Leave

Save up to 26 min

4 AM

1h 53m ★

6 AM

2h 1m

8 AM

2h 19m

10 AM

2h 7m

12 PM

2h 6m

3 PM

2h 8m

5 PM

2h 18m

8 PM

1h 56m

Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.

Best Time Drive vs Fly

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Cosmopolis, WA

Boris Hamer

Trip Overview

The drive from Cosmopolis, WA to Federal Way, WA covers 90.1 miles and takes about 2h 1m behind the wheel. This route is realistic as a one-day drive if you keep your stops efficient.

The route leans on I 5, WA 8, Olympic Highway for much of the mileage, and the overall profile is highway-focused drive. The longest uninterrupted segment is about 38.8 miles on I 5. At current regular gas prices, budget about $18.91 one way before food or hotel costs.

Trip Pace

Same-day drive is realistic

A same-day return is realistic if you keep stops short.

Break Rhythm

0 planned breaks

A short stop every 2 to 3 hours is enough for this drive.

Midpoint

45 miles from Cosmopolis, WA

A natural place for your longest stop of the day , about 1h 2m into the drive .

Drive Character

This is a 2h 1m highway drive covering 90.1 miles, with most of the trip on I 5 and WA 8. The longest continuous stretch is about 38.8 miles on I 5.

Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.

There are about 18 navigation steps in the underlying route data, so the final approach matters more than the middle miles.

I 5 is the longest continuous segment at about 38.8 miles.

How Hard Is This Drive?

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.

Route Complexity 8/10

Demanding - plan breaks and stay ahead of the key maneuvers

This is a demanding drive. With 14 significant decision points across 90.1 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.

Critical Maneuvers

5 of 14 key points

These are the spots where you need to pay the most attention. Preview them before you drive.

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.

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.

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.

88.4 mi into trip | ~1h 57m in

Take the exit toward Federal Way, South 320th Street

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. Exit 143 Toward Federal Way, South 320th Street

88.7 mi into trip | ~1h 58m in | South 320th Street

Turn left onto South 320th Street

Lane positioning matters here

Use the left / straight / right lanes.

Main Roads

Road	Distance	Duration
I 5	38.8 mi	48m
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
South 320th Street	0.8 mi	2m

Longest stretch: I 5 — 38.8 mi, about 48m

Turn-by-Turn Driving Directions

Step-by-step road directions between Cosmopolis, WA and Federal Way, WA.

Start on 3rd Street

21 ft · 2 sec · 3rd Street

Turn right onto F Street

0.1 mi · 27 sec · F Street

Turn right onto US 101

4.1 mi · 6 min · 1st Street

Use the left lane.

Turn left onto WA 107

7.0 mi · 12 min · State Route 107

Use the left lane.

Continue on WA 107

0.8 mi · 1 min · South Main Street

Take the ramp

0.4 mi · 52 sec

Merge onto US 12

10 mi · 12 min · Olympic Highway

Continue on WA 8

21 mi · 26 min · WA 8

Merge onto US 101

5.4 mi · 7 min · US 101

Keep slight left at fork

0.5 mi · 52 sec

Merge onto I 5

29 mi · 36 min · I 5

Use the straight / slight right lanes.

Keep slight right at fork onto I 5

10 mi · 12 min · I 5

Use the slight right lane.

Take the exit

0.3 mi · 51 sec

Exit 143 Toward Federal Way, South 320th Street Use the straight / slight right lanes.

Turn left onto South 320th Street

0.8 mi · 2 min · South 320th Street

Use the left / straight / right lanes.

Turn right onto WA 99

0.5 mi · 55 sec · Pacific Highway South

Turn right onto South 312th Street

158 ft · 5 sec · South 312th Street

Use the right lane.

Turn right

24 ft · 1 sec

Arrive at destination

Trip Plan

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 45 miles from Cosmopolis, WA, or about 1h 2m into the drive.

The longest continuous stretch on this route runs about 38.8 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 80 miles or 1h 46m in

Use this first pause for coffee, a restroom break, and a quick traffic check ahead.

Halfway reset

Around 45 miles or 1h 2m in

This is the best place for your longest stop, a real meal, and a full fuel check.

Final approach

Final hour starts around 1h 39m

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 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 90.1 miles and 2h 1m.

Your first comfortable stop window is around 80 miles from Cosmopolis, WA.

This route can stay practical as a one-day drive if traffic stays reasonable.

You may only need one short stretch stop if conditions stay smooth.

The longest stretch is on I 5 for about 38.8 miles.

Where to Stop

Rest stops, refuel points, and overnight suggestions along this route.

Halfway Point

Midpoint

About 45 mi from Cosmopolis, WA · 1h 2m into the drive

Mid-route town

Meal stop

Centralia, WA

45 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.

Popular next leg

Centralia, WA to Federal Way, WA

63.8 mi · 1h 20m

Pacing Suggestions

Tacoma, WA

Fuel and coffee

A short stop after about 80 miles helps settle the day before fatigue starts building.

Centralia, WA

Meal break

The midpoint is around 45 miles from Cosmopolis, WA, which is a good place for a longer meal and fuel stop.

Arriving in Federal Way, WA

The final approach into Federal Way, WA usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.

Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Federal Way, WA.

These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.

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...

19 mi from route ~48 min detour Free near mile 90.1

View on nps.gov

Park data from the National Park Service API. Alerts update every 2 hours.

Fuel & Cost

Regular Gas

$18.91 one way

$37.82 round trip

$5.33/gal 25.4 MPG avg 32 kg CO₂

Fuel Type	$/gal	One Way	Round Trip
midgrade	$5.57	$19.75	$39.50
premium	$5.77	$20.47	$40.94
diesel	$5.64	$20.02	$40.03

No toll roads detected on this route.

Estimated Trip Cost (one way, 1 person)

Fuel

$19

Meals

$25–$50

Total

$44–$69

Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.

Estimated CO2 emission: 31.5 kg one way. Prices: EIA weekly data, 2026-04-06.

Driving Electric?

About $9 in charging · 0 stops · 66% less CO₂

Vehicle Type	kWh	DC Fast	Home Charge
Average EV	27	$9.46	$4.32
Efficient EV	22.5	$7.88	$3.60
EV Truck/SUV	36	$12.61	$5.77

Gas CO2

32 kg

EV CO2

11 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 data refreshed 3 days ago

Origin

Cosmopolis, WA

Afternoon in Cosmopolis on Monday

Local time

12:07 PM

PDT

Current temp

38°F

Unavailable

Live forecast

Destination

Federal Way, WA

Afternoon in Federal Way on Monday

Local time

12:07 PM

PDT

Current temp

38°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

Very similar conditions

Both ends of the route are sitting at about the same temperature right now.

Road read

2h 1m 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.

Frequently Asked Questions

The drive from Cosmopolis, WA to Federal Way, WA covers 90.1 miles and takes about 2h 1m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.

The main roads are I 5, WA 8, Olympic Highway. Most of the drive stays on highways, so watch for ramps and exits.

This is a comfortable same-day trip.

The midpoint is about 45 miles from Cosmopolis, WA. Look for rest areas, gas stations, or food options near the halfway mark.

At current regular gas prices, expect to spend about $18.91 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.

Leave by 9 AM and you'll arrive before lunch. Even a 4 PM departure gets you there before dark in summer.

The route from Cosmopolis, WA to Federal Way, WA does not surface many named destination signs beyond the main corridor.

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Return Trip

Federal Way, WA to Cosmopolis, WA

Plan the drive back the other way.

89.4 mi 2h

Explore more options from Cosmopolis, WA or browse trips ending in Federal Way, WA.

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Trip from Cosmopolis, WA to Federal Way, WA

Best Time to Leave

Trip Overview

Drive Character

How Hard Is This Drive?

Critical Maneuvers

Main Roads

Turn-by-Turn Driving Directions

Trip Plan

Before You Leave

Where to Stop

Pacing Suggestions

Arriving in Federal Way, WA

National Parks Near This Route

Klondike Gold Rush - Seattle Unit National Historical Park

Fuel & Cost

Travel Intel

Cosmopolis, WA

Federal Way, WA

Same local time

Very similar conditions

2h 1m on the road

Frequently Asked Questions

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