$269 Cheap Flights from Tri-Cities (TRI) to Seattle (SEA)

View $269 flight on Sat, May 2, 2026Opens in a new window

Popular airlines from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle-Tacoma International Airport (SEA)

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Cheap Flights from Tri-Cities to Seattle (TRI-SEA)

Prices were available within the past 7 days and start at $269 for one-way flights and $349 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Oct 13 - Tue, Oct 27
TRI
Tri-Cities
SEA
Seattle
$349 Roundtrip, just found
$349
Roundtrip
just found
Select American Airlines flight, departing Tue, Oct 13 from Tri-Cities to Seattle, returning Tue, Oct 27, priced at $349 just found
Delta
Tue, Oct 13 - Tue, Oct 27
TRI
Tri-Cities
SEA
Seattle
$349 Roundtrip, just found
$349
Roundtrip
just found
Select Delta flight, departing Tue, Oct 13 from Tri-Cities to Seattle, returning Tue, Oct 27, priced at $349 just found
American Airlines
Wed, Sep 9 - Sat, Sep 19
TRI
Tri-Cities
SEA
Seattle
$354 Roundtrip, found 3 hours ago
$354
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Wed, Sep 9 from Tri-Cities to Seattle, returning Sat, Sep 19, priced at $354 found 3 hours ago
American Airlines
Tue, Oct 13 - Tue, Oct 27
TRI
Tri-Cities
SEA
Seattle
$369 Roundtrip, just found
$369
Roundtrip
just found
Select American Airlines flight, departing Tue, Oct 13 from Tri-Cities to Seattle, returning Tue, Oct 27, priced at $369 just found
American Airlines
Thu, Apr 23 - Mon, Apr 27
TRI
Tri-Cities
SEA
Seattle
$374 Roundtrip, found 13 hours ago
$374
Roundtrip
found 13 hours ago
Select American Airlines flight, departing Thu, Apr 23 from Tri-Cities to Seattle, returning Mon, Apr 27, priced at $374 found 13 hours ago
American Airlines
Wed, Sep 9 - Sat, Sep 19
TRI
Tri-Cities
SEA
Seattle
$374 Roundtrip, found 3 hours ago
$374
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Wed, Sep 9 from Tri-Cities to Seattle, returning Sat, Sep 19, priced at $374 found 3 hours ago
American Airlines
Sat, May 2 - Fri, May 8
TRI
Tri-Cities
SEA
Seattle
$379 Roundtrip, found 5 days ago
$379
Roundtrip
found 5 days ago
Select American Airlines flight, departing Sat, May 2 from Tri-Cities to Seattle, returning Fri, May 8, priced at $379 found 5 days ago
American Airlines
Tue, Jan 19 - Tue, Jan 26
TRI
Tri-Cities
SEA
Seattle
$389 Roundtrip, found 3 days ago
$389
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Jan 19 from Tri-Cities to Seattle, returning Tue, Jan 26, priced at $389 found 3 days ago
American Airlines
Wed, Feb 10 - Sun, Feb 14
TRI
Tri-Cities
SEA
Seattle
$394 Roundtrip, found 4 days ago
$394
Roundtrip
found 4 days ago
Select American Airlines flight, departing Wed, Feb 10 from Tri-Cities to Seattle, returning Sun, Feb 14, priced at $394 found 4 days ago
United
Tue, Oct 13 - Tue, Oct 27
TRI
Tri-Cities
SEA
Seattle
$778 Roundtrip, just found
$778
Roundtrip
just found
Select United flight, departing Tue, Oct 13 from Tri-Cities to Seattle, returning Tue, Oct 27, priced at $778 just found

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $1,028
SEA
Seattle - Tacoma Intl.
Cheapest
Average driving time to city center20 min
Flights from $1,028

Frequently asked questions

How much does a flight from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) cost?
You can find cheap one-way flights from $269 and cheap return flights from $349 Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) with Expedia. One-way flights usually range from $274 to $1099, and return flights typically cost between $541 and $1709. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The cheapest month to fly from TRI to SEA is October when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you're able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Enter TRI to SEA and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
American Airlines is one of the cheapest airlines offering connecting flights from Tri-Cities, TN (TRI) to Seattle, WA (SEA), with round-trip tickets starting from around $289. This flight includes a layover in Charlotte-Douglas Intl. (CLT). Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
To find a cheap flight from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
What is the earliest flight from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
The earliest flight from Tri-Cities (TRI) to Seattle (SEA) usually departs at around 5:00 AM, operated by American Airlines. This service is available seasonally in November, making it a good option for fall travel. An early departure can help you make the most of your time in Seattle. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
How long does it take to fly from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
Flights from TRI to SEA with one stop typically take around 9 hours 20 minutes, covering approximately 2,157 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
You can fly first class between TRI and SEA. First class cabins are available on:

  • American Airlines
  • Delta Air Lines
  • United Airlines

How do I earn miles on a Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight with Expedia?
It's easy to earn miles on a Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Seattle from Tri-Cities Regional (TRI)?
From Tri-Cities Regional (TRI), you can fly into Seattle - Tacoma Intl. (SEA) to reach Seattle. Some flights may connect through major hubs like Hartsfield-Jackson Atlanta Intl. (ATL), Charlotte-Douglas Intl. (CLT), Dallas-Fort Worth Intl. (DFW) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) at the last minute?
Typically, booking a last minute flight from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight and hotel package?
Securing a Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) Seattle Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.)?
If you booked your Tri-Cities, TN (TRI-Tri-Cities Regional) to Seattle, WA (SEA-Seattle - Tacoma Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Tri-Cities Regional
Destination airport
Seattle - Tacoma Intl.
Airlines serving
American Airlines, Delta, United
Roundtrip price
$348
Distance
2157 mi

Book with confidence

Tri-Cities to Seattle Flights

The cheapest times to fly from Tri-Cities to Seattle

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Tri-Cities to Seattle are during the month of October. You can find some of the cheapest flights from Tri-Cities to Seattle with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Tri-Cities to Seattle

Sunday is one of the best days to book for cheap flights from Tri-Cities to Seattle: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Tri-Cities to Seattle

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Tri-Cities to Seattle in 2026. You can also book with separate airlines for your outbound and return journeys, from $269 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Tri-Cities to Seattle flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Tri-Cities to Seattle airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Tri-Cities to Seattle Flights

*Flight schedules are subject to change.

*Available to One Key members.

 

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