No, I-90 is a toll-free interstate highway.

How long is the drive?

It takes approximately 7 hours of driving time.

Are there mountain passes?

Yes, you will cross Snoqualmie Pass and Lookout Pass.

Is it safe to drive in winter?

It can be challenging; ensure your vehicle is equipped for snow and ice.

What is the best time to leave?

Leaving early in the morning helps you avoid traffic in the Seattle area.

Issaquah

Missoula

Driving

Issaquah to Missoula

Updated: 28 May 2026

The drive from Issaquah to Missoula is a straightforward 650-kilometer journey heading east on Interstate 90. You will cross the Snoqualmie Pass, traverse the Columbia River Basin, and climb into the Northern Rockies. This route is highly scenic, passing through the Idaho Panhandle and into Western Montana. The drive typically takes 7 hours, making it a manageable single-day trip.

Total Distance: 650 km driving distance; 520 km air distance.

Fastest Way

Driving is the fastest way, as flights require connections and long layovers.

Cheapest Way

Driving your own vehicle is the most cost-effective and convenient method.

Compare Issaquah to Missoula Routes

Driving

Direct

Duration

7 hours

Avg Price

$110-$150 in fuel

Operator

Personal Vehicle

Route

I-90 East all the way to Missoula.

The drive through Lookout Pass on the Idaho-Montana border is beautiful but can be steep.

Travel Tips

Snoqualmie Pass
Check WSDOT cameras before leaving, as winter storms frequently impact this pass.
Time Zone Change
Remember that Montana is in the Mountain Time Zone, one hour ahead of Washington.
Rest Stops
Coeur d'Alene, Idaho, is a perfect halfway point for lunch and stretching.
Weather Prep
Montana weather is unpredictable; pack layers even in the summer months.
Fuel Efficiency
Maintain steady speeds on the mountain grades to improve your fuel economy.

Safety Tips

Mountain Driving
Use lower gears when descending steep grades to prevent brake overheating.
Wildlife
Be extremely vigilant for elk and moose on the highway, especially near the Montana border.
Emergency Kit
Carry a winter emergency kit, including a shovel and sand, if traveling between October and May.
Driver Fatigue
The monotony of I-90 can be tiring; take regular breaks at designated rest areas.