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 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 P36,182. 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 March.

Kingsport to Seattle: Flight information

The things to know before you go.
Cheapest flight foundP22,823
Cheapest month to flyMarch

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 P25,069. 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 P25,069.
As of May 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 P25,069.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Tri-Cities Airport to Seattle on Friday, 25 September 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 May, the average temperature is usually around 12°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

  • Seattle is three hours behind Kingsport, where Tri-Cities Regional Airport is located. Seattle runs on the UTC-8 timezone.

  • For a smooth journey, arrive at the airport two hours ahead of international flights and one hour before domestic departures. This will give you plenty of time to board your TRI to Seattle flight.

  • You'll likely experience longer lines in popular months like June. Arriving up to four hours in advance for international flights and two hours for domestic departures will give you plenty of time for security and boarding.

  • Located around 16 kilometers from the centre of Kingsport, TRI can be reached in about 15 minutes by car (depending on traffic). The journey on public transport takes roughly 35 minutes.

  • Catching an early flight from Tri-Cities Regional Airport to Seattle? Avoid the stress of rushing to the terminal (and sneak in some extra snooze time) by choosing one of these stays near TRI:

  • Tri-Cities Regional Airport gets top marks for on-time performance. 81% of flights that depart TRI arrive at their destination on time.

  • You'll find TRI at 2525 Tennessee 75.

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

  • P22,823 is the cheapest price we've seen for a one-way Tri-Cities Regional Airport to Seattle flight. A return ticket right now is P25,069. Depending on how early you book and the availability, these fares could change.

  • Booking early is often the key to locking in a cheap flight from TRI to Seattle. Flight prices rise as demand increases, so the nearer you get to departure, the more expensive your ticket may be.

  • The 'Whole month' search tool will show you the cheapest tickets from Tri-Cities Regional Airport to Seattle throughout the entire month. It's a great way to snap up a bargain if your travel dates are flexible.

  • Never miss a deal on cheap flights from TRI to Seattle by setting up a Price Alert. We'll send you an email or notification through the app when a lower fare becomes available.

  • Save money on your flight from Tri-Cities Regional Airport to Seattle with the help of our filters. Choose your ideal duration, number of stops and airlines, then sort the results by 'Cheapest' to see the best deals.

Airports in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) is around 23 kilometers from the centre of Seattle. If you're catching a taxi or a ride-share, the drive will take roughly 25 minutes.

  • When travelling on public transport, expect a journey time of about 35 minutes.

  • If you have a late flight from Tri-Cities Regional Airport to Seattle, nothing beats the convenience of staying near the terminal. Pick up your bags from the carousel and then be showered and snoozing soon after at one of these hotels near SEA:

  • To secure the lowest price, book your vehicle from Seattle-Tacoma International Airport around one week in advance of your flight from TRI to Seattle.

Seattle Paine Field International Airport (PAE)

  • Central Seattle is located around 40 kilometers from Seattle Paine Field International Airport (PAE). After your flight from Tri-Cities Regional Airport to Seattle has hit the runway and you've made your way to arrivals, the drive should be around 40 minutes.

  • Travelling by public transport will take about 1 hour 30 minutes.

  • Hang the 'Do not disturb' sign on your door and unwind at a hotel near PAE. Here are a few options where you can check in after your TRI to Seattle flight:

  • Get your ideal vehicle, not just what's left over, by reserving your ride from PAE in advance. You can also avoid paying more than you have to, especially when the airport is busy.

King County International Airport (BFI)

  • Find your way to the city centre after your flight from Tri-Cities Regional Airport to Seattle has landed. Central Seattle is about 11 kilometers from King County International Airport (BFI) and takes roughly 20 minutes to reach by taxi or ride-share.

  • The journey will take around 35 minutes when travelling by public transport.

  • If you don't want to travel into the centre, choose a hotel close to BFI. Make yourself comfortable at one of these stays after your TRI to Seattle flight:

  • Rental providers sometimes offer deals on early bookings, so secure your vehicle from BFI a few weeks in advance of your flight from Tri-Cities Regional Airport to Seattle. A little planning can save you money.

Best time to go to Seattle

  • It's time to pick your dates for your flight from Tri-Cities Regional Airport to Seattle. July is the most popular month to visit Seattle. If you want a more relaxed vibe, go in December.

  • Book a Tri-Cities Regional Airport to Seattle plane ticket with a departure in August to explore the city during its warmest month. Expect temperatures to range from 12ºC (54ºF) to 28ºC (82ºF).

  • Look for cheap tickets from TRI to Seattle in February if you'd rather travel during cooler conditions. Temperatures are at their lowest then, ranging between -1ºC (30ºF) and 11ºC (52ºF) on average.

More about Seattle

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

  • Pike Place Market and Space Needle are just two of the big attractions to add to your Seattle must-do list. Continue your sightseeing adventures at Seattle Skyline.

Explore more of the United States

  • You've visited Seattle, now it's time to explore other corners of the United States. Travel around 241 kilometers south to Portland to tick off its leading sights. From Portland Japanese Garden to Peninsula Park Rose Garden and Beyond Van Gogh Portland, there's plenty to keep you on the go.

  • Around 370 kilometers east of Seattle, Spokane is another essential stop in the United States. Experience the best of this destination with a visit to Riverside State Park, Spokane Falls (Upper Falls) and Cathedral of Our Lady of Lourdes.

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