How Long Is the Drive from Seattle to Mercer Island?
The drive from Seattle to Mercer Island takes approximately 1h 45min, covering 49 miles via I-5. Under normal conditions, expect to spend around $5 on gas.
Travel time can vary — during peak hours, weekends, or holidays, the journey may take 2–3+ hours. For the fastest trip, leave early morning (before 7 AM) or travel on weekday evenings.
Traffic Estimate
🟢 Light traffic
1h 29m
🔵 Typical
1h 45min
🔴 Heavy traffic
2h 32m
Traffic is usually worst during weekday rush hours (7–9 AM, 4–7 PM) and holiday weekends.
Trip Details
Distance49 miles (78 km)
Drive Time1h 45min
RouteI-5
Best TimeMid-morning (9-11 AM)
Fuel Costs
Gas (30 mpg)~1.6 gallons
Est. Cost$5
Best Time to Drive from Seattle to Mercer Island
For this shorter drive, the best time to go is mid-morning (9-11 am). Rush hour (7-9 AM and 4-7 PM) can add significant time on this route. Weekends are generally smoother unless it's a holiday.
🟢 Best:Mid-morning (9-11 AM)
🔴 Avoid:Rush hour (4-7 PM)
Route Tips: I-5
The main West Coast highway. Heavy traffic near LA, San Francisco, and Seattle. Scenic stretches through Oregon and Northern California.
This trip can typically be done on a single tank of gas.
Frequently Asked Questions
How long does it take to drive from Seattle to Mercer Island?
The drive from Seattle to Mercer Island takes approximately 1h 45min covering 49 miles via I-5. Actual time may vary based on traffic, weather, and road conditions.
How much does gas cost for Seattle to Mercer Island?
At 30 MPG and $3.50/gallon, expect to spend approximately $5 on gas for this 49-mile trip. You'll need about 1.6 gallons of fuel.
What is the best time to drive from Seattle to Mercer Island?
Mid-morning (9-11 AM) to avoid heavy traffic. Weekday mornings before 7 AM or evenings after 7 PM typically have less congestion.
Are there tolls on the Seattle to Mercer Island route?
There may be minor tolls (around $1) on parts of this route. Some sections have toll-free alternatives.
