$286 Cheap United flights Knoxville (TYS) to Seattle (SEA)

View $286 flight on Tue, Feb 10, 2026Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$286 Cheap United flights Knoxville (TYS) to Seattle (SEA)

Prices were available within the past 7 days and start at $286 for one-way flights and $309 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Oct 29 - Sat, Nov 1
TYS
Knoxville
SEA
Seattle
$309 Roundtrip, found 2 hours ago
$309
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Oct 29 from Knoxville to Seattle, returning Sat, Nov 1, priced at $309 found 2 hours ago
United
Wed, Oct 29 - Sat, Nov 1
TYS
Knoxville
SEA
Seattle
$321 Roundtrip, found 2 hours ago
$321
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Oct 29 from Knoxville to Seattle, returning Sat, Nov 1, priced at $321 found 2 hours ago
United
Sat, Oct 25 - Sun, Oct 26
TYS
Knoxville
SEA
Seattle
$326 Roundtrip, found 10 hours ago
$326
Roundtrip
found 10 hours ago
Select United flight, departing Sat, Oct 25 from Knoxville to Seattle, returning Sun, Oct 26, priced at $326 found 10 hours ago
United
Tue, Sep 9 - Sat, Sep 13
TYS
Knoxville
SEA
Seattle
$326 Roundtrip, found 1 day ago
$326
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 9 from Knoxville to Seattle, returning Sat, Sep 13, priced at $326 found 1 day ago
United
Wed, Oct 29 - Sat, Nov 1
TYS
Knoxville
SEA
Seattle
$328 Roundtrip, found 2 hours ago
$328
Roundtrip
found 2 hours ago
Select United flight, departing Wed, Oct 29 from Knoxville to Seattle, returning Sat, Nov 1, priced at $328 found 2 hours ago
United
Mon, Sep 29 - Sat, Oct 4
TYS
Knoxville
SEA
Seattle
$329 Roundtrip, found 3 hours ago
$329
Roundtrip
found 3 hours ago
Select United flight, departing Mon, Sep 29 from Knoxville to Seattle, returning Sat, Oct 4, priced at $329 found 3 hours ago
United
Sat, Nov 8 - Wed, Nov 12
TYS
Knoxville
SEA
Seattle
$331 Roundtrip, found 2 days ago
$331
Roundtrip
found 2 days ago
Select United flight, departing Sat, Nov 8 from Knoxville to Seattle, returning Wed, Nov 12, priced at $331 found 2 days ago
United
Sat, Sep 20 - Sun, Sep 21
TYS
Knoxville
SEA
Seattle
$332 Roundtrip, found 5 days ago
$332
Roundtrip
found 5 days ago
Select United flight, departing Sat, Sep 20 from Knoxville to Seattle, returning Sun, Sep 21, priced at $332 found 5 days ago
Flights from Knoxville (TYS) to Seattle (SEA)
Origin airport
McGhee Tyson
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Popular airline
Alaska Airlines
Distance
2109 mi

Frequently asked questions

How much is a United Airlines flight from McGhee Tyson Airport (TYS) to Seattle - Tacoma Intl. Airport (SEA)?
Set the "Price (lowest to highest)" filter on Expedia to look for cheap United Airlines round-trip flights from $309 from TYS to SEA. Affordable one-way fares from $286 are available too.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from TYS to SEA with United Airlines?
United Airlines flights to Seattle are typically cheaper in the low-season months of January and February. Whether you need a return or one-way ticket, you could land a better deal then.
What is the cheapest time to book flights from McGhee Tyson Airport (TYS) to Seattle - Tacoma Intl. Airport (SEA) with United Airlines?
For cheap United Airlines fares from McGhee Tyson Airport (TYS) to Seattle - Tacoma Intl. Airport (SEA), start searching one to three months before your intended departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact how much you pay. Sunday is usually the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your trip on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from McGhee Tyson Airport (TYS) to Seattle - Tacoma Intl. Airport (SEA)?
Simply enter your dates, hit search and check the "Nonstop" filter on Expedia to browse any direct flights from TYS to SEA with United Airlines or another airline.
What is the earliest United Airlines flight from TYS to SEA?
Search United Airlines's earliest flights from TYS to SEA by selecting the "Early Morning" and "Morning" filters. Not only will you get to where you're going sooner, early departures are also 20% less likely to be canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Seattle?
United Airlines flights from McGhee Tyson Airport (TYS) to Seattle land at Seattle - Tacoma Intl. Airport (SEA). This is the main entry point here.
Why fly with United Airlines from TYS to SEA?
A rewarding loyalty program and the ability to collect points through United Mileage Plus are the start of the reasons to leave from TYS to SEA with United Airlines. Plus, by joining Expedia's free One Key™ program, you can receive OneKeyCash™* alongside United Airlines's loyalty program earnings. It's yours to spend on future travel plans.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my United Airlines flight from McGhee Tyson Airport (TYS) to Seattle - Tacoma Intl. Airport (SEA)?
It's usually possible to cancel or change your flight, although there may be additional fees if your booking was made over 24 hours ago. Need flexible options? Make use of our "No cancel fee" or "Changes included" filter to find flights that won't penalize you if you need to revise your plans. To make modifications, go to "Trips," select your flight and click on "Manage Booking" for further information.

Explore a world of travel with Expedia

*Available to One Key members.