Flight
Driving
Portsmouth to Seattle
Updated: 28 May 2026
The journey from Portsmouth to Seattle covers approximately 3,000 miles. Driving involves taking I-90 West. Flying from Boston Logan (BOS) to Seattle-Tacoma International Airport (SEA) is the most efficient way to travel. The route takes you through the heart of the Midwest and across the Rocky Mountains.
Total Distance: 4,800 km driving distance; 4,000 km straight-line air distance.
Fastest Way
Flying from Boston Logan (BOS) takes about 7 hours total.
Cheapest Way
Driving is the most cost-effective for groups.
Compare Portsmouth to Seattle Routes
|
Direct
|
Direct
|
|
|---|---|---|
| Duration | 7 hours | 45 hours |
| Avg Price | $300 - $600 | $500 - $750 in fuel |
| Operator | Alaska Airlines | Personal Vehicle |
| Route | BOS to SEA | I-90 W |
| Tip | Alaska Airlines offers convenient direct flights from Boston. | Expect long stretches of open road in the West. |
Travel Tips
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TrafficSeattle traffic can be heavy; use public transit.
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TransportationPublic transit is excellent in the city.
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WeatherThe weather can be rainy; pack a raincoat.
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ParkingParking is very expensive and hard to find.
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NavigationUse traffic apps to avoid congestion.
Safety Tips
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Urban SafetyStay in well-lit areas at night.
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Vehicle SecurityDo not leave valuables in your car.
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Road SafetyBe cautious of heavy traffic on the freeways.
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EmergencyKeep a list of local emergency contacts.
People Also Ask
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Is there a train to Seattle?Yes, Amtrak's Empire Builder serves Seattle.
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How long is the drive?Approximately 45 hours of driving time.
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Are there tolls?Yes, expect tolls on the East Coast turnpikes.
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Is Seattle safe?Exercise standard city safety precautions.
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What is the best way to get around?Public transit is recommended.
Quick Info
- From Portsmouth, New Hampshire, United States
- To Seattle, Washington, United States
-
Modes
Best Time to Travel
July to September for mild weather and outdoor activities.
Things to Do in Seattle
1
Space Needle
Enjoy stunning views of the city.
2
Pike Place Market
Explore the famous market.
3
Museum of Pop Culture
Visit the unique museum.
4
Chihuly Garden and Glass
See the beautiful glass art.
Tags
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