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$180+ Cheap flights from Knoxville to Seattle (TYS - SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — SEA
Jan 27 — Feb 31
Tue 1/27
Tue 2/3
1 adult, Economy
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Cheap flight deals from Knoxville to Seattle

Cheapest flights from Knoxville to Seattle
Explore the most affordable flight options available from Knoxville to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 28, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/304:46 pmTYS - SEA
1 stop22h 44mMultiple Airlines
Fri 1/27:48 pmSEA - TYS
1 stop21h 54mMultiple Airlines
Deal found 12/25$497
This United Airlines deal was found by Cheapflights users on 12/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:00 pmTYS - SEA
1 stop9h 57mUnited Airlines
Tue 12/3011:15 pmSEA - TYS
1 stop8h 41mUnited Airlines
Deal found 12/27$563
This United Airlines deal was found by Cheapflights users on 12/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/295:15 pmTYS - SEA
1 stop10h 19mUnited Airlines
Thu 1/15:02 amSEA - TYS
1 stop6h 58mUnited Airlines
Deal found 12/26$614
This American Airlines deal was found by Cheapflights users on 12/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/265:08 pmTYS - SEA
1 stop9h 05mAmerican Airlines
Sun 12/2812:14 amSEA - TYS
1 stop7h 36mAmerican Airlines
Deal found 12/26$617
This United Airlines deal was found by Cheapflights users on 12/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/275:45 amTYS - SEA
1 stop8h 42mUnited Airlines
Sat 1/35:02 amSEA - TYS
1 stop6h 58mUnited Airlines
Deal found 12/26$663
This United Airlines deal was found by Cheapflights users on 12/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/305:45 amTYS - SEA
1 stop8h 42mUnited Airlines
Thu 1/15:00 amSEA - TYS
2 stops11h 51mUnited Airlines
Deal found 12/27$719
This United Airlines deal was found by Cheapflights users on 12/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/265:15 pmTYS - SEA
1 stop10h 19mUnited Airlines
Mon 12/298:57 amSEA - TYS
2 stops10h 42mUnited Airlines
Deal found 12/26$772

Find flight deals from Knoxville to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$277
(Kiwi.com)

One-way from

$180
(American Airlines)

Popular in

December

Cheapest in

August

Average price

$891
Provider with most accurate pricing for Knoxville McGhee Tyson-Seattle/Tacoma Intl flight deals.
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Provider most trusted by Cheapflights users for Knoxville McGhee Tyson-Seattle/Tacoma Intl flights.
Search Deals
From Knoxville McGhee Tyson to Seattle/Tacoma Intl
Search Deals
One-way flight from Knoxville McGhee Tyson to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 28, 2025.
Use the filters below to find and compare flights from Knoxville to Seattle that are best for you.

Fly from

Knoxville

Fly to

Seattle

Route

Depart

Return

Price

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Wed 2/18

2:21 pm-10:43 pm

2 stops11h 22m

Seattle/Tacoma Intl

Tue 2/24

10:55 am-8:37 pm

1 stop6h 42m

$364

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Wed 2/25

9:40 am-6:03 pm

2 stops11h 23m

Seattle/Tacoma Intl

Mon 3/2

10:55 am-8:37 pm

1 stop6h 42m

$377

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sat 4/25

3:03 pm-11:05 pm

1 stop11h 02m

Seattle/Tacoma Intl

Sat 5/2

7:00 am-11:06 pm

1 stop13h 06m

$395

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sun 1/25

6:45 am-11:32 am

1 stop7h 47m

Seattle/Tacoma Intl

Wed 1/28

10:58 am-8:52 pm

1 stop6h 54m

$398

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 6/8

5:57 pm-12:06 am

1 stop9h 09m

Seattle/Tacoma Intl

Mon 6/15

9:58 pm-10:10 am

1 stop9h 12m

$437

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 3/6

6:23 pm-11:09 pm

1 stop7h 46m

Seattle/Tacoma Intl

Thu 3/12

11:57 pm-10:10 am

1 stop7h 13m

$437

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Tue 5/5

7:00 am-11:39 am

1 stop7h 39m

Seattle/Tacoma Intl

Tue 5/12

5:07 am-6:14 pm

2 stops10h 07m

$442

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 3/5

3:45 pm-1:25 am

2 stops12h 40m

Seattle/Tacoma Intl

Mon 3/9

9:05 am-9:15 pm

2 stops9h 10m

$457

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 5/28

5:50 am-11:15 am

1 stop8h 25m

Seattle/Tacoma Intl

Sat 6/6

11:50 pm-9:59 am

1 stop7h 09m

$472

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sat 2/14

1:50 pm-7:03 pm

1 stop8h 13m

Seattle/Tacoma Intl

Wed 2/18

10:55 am-8:37 pm

1 stop6h 42m

$472

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/27

Showing 1-10 of 20 results
1
2

Compare providers for flights from Knoxville to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Knoxville to Seattle in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapflightsfaresPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Knoxville-Seattle flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Knoxville-Seattle flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Knoxville-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Knoxville-Seattle flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Knoxville-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Knoxville to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Knoxville with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Knoxville to Seattle

How far ahead should I book a flight from Knoxville to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Knoxville to Seattle. Price data was last updated on December 26, 2025.

The best time to book flights from Knoxville to Seattle is 44 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Knoxville to Seattle?

Currently, April is the cheapest month in which you can book a flight from Knoxville to Seattle (average of $174). Flying from Knoxville to Seattle in December is currently the most expensive (average of $334). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from TYS to SEA?

Find hourly flight availability from Knoxville to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 28, 2025.

It’s typically best to fly out from Knoxville to Seattle in the evening. Doing so could potentially save you 53% on the flight price compared to flying at noon, which is usually more expensive.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated December 28, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Knoxville to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,018 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,018 reviews
Delta
7.9
Good
8,018 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,113 reviews
Delta
7.9
Good
8,018 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
American Airlines
7.2
Good
11,072 reviews
Delta
7.9
Good
8,018 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Frontier
5.8
Fair
3,064 reviews
Delta
7.9
Good
8,018 reviews

Entertainment

7.9

Comfort

7.9

Food

7.3

Crew

8.5

Boarding

8.1

Overall

7.9

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

Related info for your journey

Find useful and relevant information for your journey from Knoxville to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Knoxville to Seattle?

    A quick flight from Knoxville to Seattle can take about 9h 09m. United Airlines provides one of the quickest options available for as low as $437. There are 2109 mi between Knoxville and Seattle. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Knoxville to Seattle round-trip?

    According to our current data, Frontier ($248), Delta ($318), and American Airlines ($342) offers the cheapest pricing from Knoxville to Seattle. These flights start at 59% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Knoxville to Seattle one-way?

    One-way options have recently been found by users for as low as $93 on Frontier. Other airlines that offer cheap prices include American Airlines from $218 and Delta from $218 one-way.

  • Can I find deals for flights from Knoxville to Seattle that include hotel bookings?

    Yes. In addition to deals on Knoxville to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Knoxville to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Seattle.

  • Can I find deals for business class flights from Knoxville to Seattle?

    Yes. Cheapflights offers flight deals from Knoxville to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Knoxville to Seattle?

    Currently, April is the cheapest month in which you can book a flight from Knoxville to Seattle (average of $174). Flying from Knoxville to Seattle in December is currently the most expensive (average of $334). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Edmonds
Lynnwood
Renton
Puyallup
Kirkland
Kent
Tukwila
Cle Elum
Marysville
Fife
Aberdeen
Shoreline
Centralia
Federal Way
Chehalis

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Top 4 airlines flying from Knoxville to Seattle

Discover the top 4 airlines that operate flights from Knoxville to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$248Average$330FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$327Average$596FlexibilityNo cancel feeOn-time71%
DeltaCheapest$368Average$603FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$397Average$627FlexibilityNo cancel feeOn-time69%

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