C$237 Cheap Flights from Tri-Cities (TRI) to Seattle (SEAA)

Compare Tri-Cities to Seattle flight deals

Find the cheapest month or even day of the year to fly to Seattle

Book the best Seattle fare with no extra fees

Flight deals from Tri-Cities to Seattle

Looking for a cheap last-minute deal or the best return flight from Tri-Cities Airport to Seattle? If you want to travel next month, return fares start from C$725. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Tri-Cities to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Tri-Cities to Seattle flights are currently cheapest in August.

Kingsport to Seattle: Flight information

The things to know before you go.
Cheapest flight foundC$237
Cheapest month to flyAugust

Finding cheap flights from Tri-Cities to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Tri-Cities to Seattle is C$610. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Tri-Cities to Seattle. But we found flights with one or more stops from C$610.
As of June 2026, there are no flights flying from Tri-Cities to Seattle.
The cheapest month to fly from Tri-Cities to Seattle is usually September.
If you're flying from Tri-Cities Airport, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from C$610.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Tri-Cities Airport to Seattle on Monday, September 21, 2026.
No airlines currently offer direct flights between Tri-Cities Airport and Seattle. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In June, the average temperature is usually around 14°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
Currently, Breeze Airways offers the cheapest flight tickets to Seattle.

Travelling from Tri-Cities Regional Airport (TRI) to Seattle: what you need to know

  • The timezone in Seattle is UTC-7. The city is 3 hours behind Kingsport, where Tri-Cities Regional Airport is located.

  • Leave plenty of time to make your flight from TRI to Seattle. As a general rule, arrive two hours before international departures and an hour ahead for domestic flights.

  • Hopping on a plane during a peak month like July? Popular seasons (like summer, Thanksgiving, Christmas and spring break) can easily add another hour at check-in and security. Be extra cautious and arrive up to four hours before international flights and two hours before domestic departures.

  • You don't need a visa or passport to fly within United States. You will need a valid identity document however, like an ID card or driver's licence. Add them to your packing checklist after booking your flight tickets from Tri-Cities Regional Airport to Seattle.

  • TRI is approximately 23 kilometres from central Kingsport. If you're driving, catching a cab or ride-sharing from the centre, it'll take you 23 minutes or so to get there, depending on traffic conditions.

  • Catching an early flight from Tri-Cities Regional Airport to Seattle? Avoid the hassle of rushing to the airport (and enjoy a little extra shut-eye) by picking one of these hotels close to TRI:

How to find the cheapest flights from Tri-Cities Regional Airport (TRI) to Seattle

  • C$237 is the best price for a one-way ticket from Tri-Cities Regional Airport to Seattle. A return flight starts at C$610. These prices may change depending on demand and availability.

  • To get your hands on cheap tickets from TRI to Seattle, book ahead. Airlines tend to offer their most competitively priced fares when flights are first released.

  • If you're flexible with your travel dates, use the 'Whole month' tool. It'll find the lowest price across each month when looking for a ticket from Tri-Cities Regional Airport to Seattle.

  • Set up a Price Alert for cheap tickets from TRI to Seattle. There's no need to look every day to see whether fares have dropped. We'll tell you the moment the price changes.

  • Tailor your travel plans with filters. Choose your preferred arrival and departure times, airlines and total journey duration. You can also sort the results by 'Best,' 'Cheapest' or 'Fastest' flights from Tri-Cities Regional Airport to Seattle.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) to the centre of Seattle is about 18 minutes by car. It's approximately 23 kilometres away.

  • Getting to the centre on public transport typically takes 54 minutes.

  • If you're coming in on a late flight from Tri-Cities Regional Airport to Seattle, few things beat the convenience of staying close to the terminal. Collect your bags from the carousel and then be showered and sleeping soon after at one of these accommodation options near SEA:

Lake Union Sea Plane Base Airport (LKE)

Best time to go to Seattle

  • It's time to choose your travel dates for your flight from Tri-Cities Regional Airport to Seattle. July is the busiest month to travel to Seattle. If you want a more low-key vibe, go in May.

  • The warmest month in Seattle is August, with the temperature ranging between 12ºC and 28ºC. Book your flights from Tri-Cities Regional Airport to Seattle in this month if this is the type of weather you enjoy.

  • For cooler conditions, look for a cheap flight from TRI to Seattle in February when temperatures average between -1ºC and 11ºC.

More about Seattle

  • When it comes to searching for somewhere to lay your head, you'll find the best places to stay in Seattle right here. Browse these hotels as soon as you've locked in your flight from Tri-Cities Regional Airport to Seattle:

  • Gas Works - Lake View Point and Queen Anne Bowl Playfield are just the start of the major attractions to put on your Seattle to-do list. Keep the adventure rolling by checking out LMN Architects.

Complete your Seattle trip with a car rental

  • Finding you a cheap flight from Tri-Cities Regional Airport to Seattle isn't our only party trick. Check out our car rentals in Seattle and explore the city on your own terms. We find deals from trusted car rental companies and put them all in one place. You can instantly compare offers and then book with no fees.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.