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Cheap Flights from Tri-Cities to Seattle

Compare Tri-Cities to Seattle flight deals

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

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Flight deals from Tri-Cities Airport 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 $1,133. Find the lowest prices on one-way and return tickets right here.
Seattle.$881 per passenger.Departing Thu, 11 Jun, returning Mon, 15 Jun.Return flight with Delta.Outbound indirect flight with Delta, departs from Tri-Cities on Thu, 11 Jun, arriving in Seattle / Tacoma International.Inbound indirect flight with Delta, departs from Seattle / Tacoma International on Mon, 15 Jun, arriving in Tri-Cities.Price includes taxes and charges.From $881, select.
Seattle.$915 per passenger.Departing Tue, 17 Mar, returning Mon, 23 Mar.Return flight with Delta.Outbound indirect flight with Delta, departs from Tri-Cities on Tue, 17 Mar, arriving in Seattle / Tacoma International.Inbound indirect flight with Delta, departs from Seattle / Tacoma International on Mon, 23 Mar, arriving in Tri-Cities.Price includes taxes and charges.From $915, select.
Seattle.$1,133 per passenger.Departing Wed, 1 Apr, returning Sun, 5 Apr.Return flight with Delta.Outbound indirect flight with Delta, departs from Tri-Cities on Wed, 1 Apr, arriving in Seattle / Tacoma International.Inbound indirect flight with Delta, departs from Seattle / Tacoma International on Sun, 5 Apr, arriving in Tri-Cities.Price includes taxes and charges.From $1,133, select.
Seattle.$1,133 per passenger.Departing Tue, 31 Mar, returning Sun, 5 Apr.Return flight with Delta.Outbound indirect flight with Delta, departs from Tri-Cities on Tue, 31 Mar, arriving in Seattle / Tacoma International.Inbound indirect flight with Delta, departs from Seattle / Tacoma International on Sun, 5 Apr, arriving in Tri-Cities.Price includes taxes and charges.From $1,133, select.

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 June.
Mar
from $915
Apr
from $1,133
May
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Jun
from $881
Jul
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Aug
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Sep
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Oct
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Nov
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Dec
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Jan
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Feb
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Alternative Tri-Cities to Seattle routes

Looking for the cheapest, fastest or easiest route from Tri-Cities to Seattle? You could fly into the following airports instead.

Seattle Lake Union SPB

2km from central Seattle
Closest
Search flights

Seattle Boeing Fld

11km from central Seattle
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Seattle / Tacoma International

20km from central Seattle
Cheapest
from $881
Search flights

Paine Field

33km from central Seattle
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Kingsport to Seattle: Flight information

The things to know before you go.
Cheapest flight found$881
Cheapest month to flyJune

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 $881. 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 $881.
As of March 2026, there are no flights flying from Tri-Cities to Seattle.
The cheapest month to fly from Tri-Cities to Seattle is usually June.
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 $881.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Tri-Cities Airport to Seattle on Thursday, 11 June 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 March, the average temperature is usually around 6°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, Delta offers the cheapest flight tickets to Seattle.

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

  • Tri-Cities Regional Airport is located in Kingsport. Based in the UTC-7 timezone, Seattle is three hours behind Kingsport.

  • For a relaxed start to your TRI to Seattle flight, leave enough time for things like check-in and baggage drop. Turning up two hours ahead of international departures and an hour before domestic flights is the general travel rule.

  • Travelling during a peak time like a bank holiday? Expect longer lines at check-in and security. To play it safe, arrive up to four hours before international flights and two hours before domestic departures.

  • To get to TRI from central Kingsport, it'll take around 25 minutes if you're travelling by car. It's roughly 16 kilometres from the airport to the city centre.

  • Looking for a hotel close to TRI? If you've booked an early flight from Tri-Cities Regional Airport to Seattle, these stays will put you moments from your departure gate:

  • 79.37% of flights that take off from Tri-Cities Regional Airport touch down at their destination on schedule.

  • TRI's address is 2525 Tennessee 75.

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

  • The lowest price we've found for a one-way Tri-Cities Regional Airport to Seattle flight is $529. The cheapest price for a return flight is $881. Remember fares may change due to availability at the time of booking.

  • To find cheap flights from TRI to Seattle, book as early as you can. Airlines generally offer the most competitive fares when flights first go on sale.

  • The 'Whole month' search tool will show you the cheapest tickets from Tri-Cities Regional Airport to Seattle throughout the entire month. It's an easy way to snap up a bargain if your trip dates aren't set in stone.

  • Save time looking for cheap flights from TRI to Seattle by creating a Price Alert. You'll receive an email or notification through the app when a lower fare pops up.

  • Tailor your flights with filters. Pick your preferred arrival and departure times, airlines and total journey duration. You can also sort the results by 'Cheapest,' 'Fastest' or 'Best' 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 takes around 20 minutes to reach by car. The centre is roughly 23 kilometres away.

  • Getting there by public transport takes about 55 minutes.

  • Consider staying in a hotel near SEA if you're coming in on a late flight from Tri-Cities Regional Airport to Seattle. Select one of these accommodation options and skip the long transfer:

  • Get on the fast track to adventure by picking up a Seattle-Tacoma International Airport rental car. Grab your wheels from Thrifty, Europcar or Budget to explore Seattle and beyond.

  • Get the best deal by booking your ride from Seattle-Tacoma International Airport around one week in advance of your flight from TRI to Seattle.

Lake Union Sea Plane Base Airport (LKE)

  • Lake Union Sea Plane Base Airport (LKE) is about 3 kilometres from central Seattle. Once you've disembarked your flight from Tri-Cities Regional Airport to Seattle, it'll take you around 10 minutes to get to the heart of the city in a ride-share or cab.

  • The journey will take roughly 25 minutes on public transport.

  • There are some great places to call home for the night near LKE. Tuck yourself in and get cosy after your TRI to Seattle flight at one of these well-located options:

Best time to go to Seattle

  • Carefully consider your travel dates before securing your flight from Tri-Cities Regional Airport to Seattle. The city comes alive in peak season, but prices are typically higher and major attractions can get busy. Visit Seattle in the low season for a more relaxed vibe.

  • When booking your Tri-Cities Regional Airport to Seattle flight ticket, think about what kind of weather you prefer. August is the warmest month in Seattle, with temperatures ranging from 12ºC to 28ºC.

  • If you like travelling in cooler conditions, search for a cheap ticket from TRI to Seattle in February when temperatures average between -1ºC and 11ºC.

More about Seattle

  • When it comes to looking for somewhere to lay your head, you'll find the most popular stays in Seattle right here. Browse these options as soon as you've locked in your flight from Tri-Cities Regional Airport to Seattle:

  • Every great journey has to include a little sightseeing. LMN Architects, Greyhound: Bus Station and Boeing Radiation Effects Lab are must-do's during your Seattle adventure.

Explore more of United States

  • Seattle will leave a lasting impression, but there are so many other parts of United States you'll want to see. Around 241 kilometres south of Seattle, a visit to Portland will keep you on the move. Start with popular sights like Pioneer Courthouse Square, Portland Japanese Garden and Pittock Mansion.

  • Around 370 kilometres east of Seattle, Spokane is another favourite stop in United States. Get a taste of what this destination has to offer at Manito Park, Northwest Museum of Arts & Culture and Spokane Falls.

Plan the rest of your trip from Kingsport to Seattle

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.