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$79+ 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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — SEA
Aug 21 — Aug 281
Thu 8/21
Thu 8/28
1 adult, Economy
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Cheapflights Tip: The best prices from Knoxville McGhee Tyson to Seattle/Tacoma Intl are usually found in August or September, booked 62 days in advance, depart on a Friday or Tuesday and return on a Tuesday

Cheap 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 August 16, 2025.

Round-trip from

$183
(FlightHub)

One-way from

$79
(Priceline)

Popular in

February

Cheapest in

August

Average price

$443
From Knoxville McGhee Tyson to Seattle/Tacoma Intl
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One-way flight from Knoxville McGhee Tyson to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 8% potential increase in price ($58 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find 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 August 16, 2025.

This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/178:17 pmTYS - SEA
1 stop18h 50mFrontier
Sun 10/262:31 pmSEA - TYS
1 stop26h 01mFrontier
Deal found 8/14$183
This Priceline deal was found by Cheapflights users on 8/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/258:40 pmTYS - SEA
1 stop6h 50mFrontier
Mon 9/296:12 amSEA - TYS
1 stop10h 33mFrontier
Deal found 8/15$188
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/298:35 pmTYS - SEA
1 stop6h 55mFrontier
Sun 10/58:35 pmSEA - TYS
2 stops20h 10mFrontier
Deal found 8/14$202
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/168:17 pmTYS - SEA
1 stop14h 16mFrontier
Sun 10/262:31 pmSEA - TYS
1 stop26h 01mFrontier
Deal found 8/14$229
This Frontier deal was found by Cheapflights users on 8/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/28:40 pmTYS - SEA
1 stop6h 50mFrontier
Sun 10/58:35 pmSEA - TYS
2 stops20h 10mFrontier
Deal found 8/14$240
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/218:36 pmTYS - SEA
1 stop15h 58mFrontier
Mon 8/256:17 amSEA - TYS
1 stop9h 08mFrontier
Deal found 8/14$241
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/135:14 pmTYS - SEA
1 stop10h 17mFrontier
Sun 11/166:00 amSEA - TYS
1 stop7h 14mFrontier
Deal found 8/14$242
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/118:40 pmTYS - SEA
1 stop6h 50mFrontier
Thu 9/186:12 amSEA - TYS
1 stop10h 38mFrontier
Deal found 8/14$254
This Priceline deal was found by Cheapflights users on 8/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/257:10 pmTYS - SEA
1 stop8h 24mFrontier
Thu 8/286:17 amSEA - TYS
1 stop10h 24mFrontier
Deal found 8/14$261
This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
Sun 9/77:00 amTYS - SEA
1 stop20h 30mMultiple Airlines
Sat 9/137:00 amSEA - TYS
1 stop27h 43mMultiple Airlines
Deal found 8/12$273
This Kiwi.com deal was found by Cheapflights users on 8/15. 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.
Fri 11/76:12 pmTYS - SEA
2 stops21h 01mMultiple Airlines
Wed 11/1212:58 pmSEA - TYS
1 stop21h 46mMultiple Airlines
Deal found 8/15$278

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 August 16, 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

Fri 10/17

8:17 pm-12:07 pm

1 stop18h 50m

Seattle/Tacoma Intl

Sun 10/26

2:31 pm-7:32 pm

1 stop26h 01m

$183

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 9/25

8:40 pm-12:30 am

1 stop6h 50m

Seattle/Tacoma Intl

Mon 9/29

6:12 am-7:45 pm

1 stop10h 33m

$188

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 9/29

8:35 pm-12:30 am

1 stop6h 55m

Seattle/Tacoma Intl

Sun 10/5

8:35 pm-7:45 pm

2 stops20h 10m

$202

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 10/16

8:17 pm-7:33 am

1 stop14h 16m

Seattle/Tacoma Intl

Sun 10/26

2:31 pm-7:32 pm

1 stop26h 01m

$229

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 10/2

8:40 pm-12:30 am

1 stop6h 50m

Seattle/Tacoma Intl

Sun 10/5

8:35 pm-7:45 pm

2 stops20h 10m

$240

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 11/13

5:14 pm-12:31 am

1 stop10h 17m

Seattle/Tacoma Intl

Sun 11/16

6:00 am-4:14 pm

1 stop7h 14m

$242

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 9/11

8:40 pm-12:30 am

1 stop6h 50m

Seattle/Tacoma Intl

Thu 9/18

6:12 am-7:50 pm

1 stop10h 38m

$254

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 8/25

7:10 pm-12:34 am

1 stop8h 24m

Seattle/Tacoma Intl

Thu 8/28

6:17 am-7:41 pm

1 stop10h 24m

$261

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sun 9/7

7:00 am-12:30 am

1 stop20h 30m

Seattle/Tacoma Intl

Sat 9/13

7:00 am-1:43 pm

1 stop27h 43m

$273

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 11/7

6:12 pm-12:13 pm

2 stops21h 01m

Seattle/Tacoma Intl

Wed 11/12

12:58 pm-1:44 pm

1 stop21h 46m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 19 results
1
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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 August 8, 2025.

The best time to book flights from Knoxville to Seattle is 62 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, January is the cheapest month in which you can book a flight from Knoxville to Seattle (average of $238). Flying from Knoxville to Seattle in June is currently the most expensive (average of $389). 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 August 16, 2025.

It’s typically best to fly out from Knoxville to Seattle in the evening. Doing so could potentially save you 54% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Knoxville to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Knoxville to Seattle. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Knoxville to Seattle flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

What’s the top layover airport for flights from Knoxville to Seattle?

Share of 1-stop round-trip flights from Knoxville to Seattle chosen by Cheapflights users in the past 12 months, using the same layover each way.

Chicago (ORD) – chosen by Cheapflights users on 50% of 1-stop itineraries from Knoxville to Seattle on Cheapflights.

What’s the cheapest layover airport for flights from Knoxville to Seattle?

Average round-trip fare for 1-stop flights from Knoxville to Seattle, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Washington, D.C. (IAD) is the most affordable 1-stop option, with an average round-trip price of $686.

What’s the fastest layover option from Knoxville to Seattle?

Shortest average travel time for 1-stop one-way flights from Knoxville to Seattle, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 8h 10m.

Which airport typically offers the quickest layover for flights from Knoxville to Seattle?

Average layover duration for 1-stop one-way flights from Knoxville to Seattle, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Washington, D.C. (IAD) offer the fastest connection on this route, with an average layover time of 1h 15m.

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 August 16, 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
8.0
Very good
7,985 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,985 reviews
Delta
8.0
Very good
7,985 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,916 reviews
Delta
8.0
Very good
7,985 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,985 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Frontier
5.8
Fair
3,211 reviews
Delta
8.0
Very good
7,985 reviews

Crew

8.5

Boarding

8.2

Food

7.3

Overall

8.0

Entertainment

7.9

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

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

    According to our current data, Frontier ($178), American Airlines ($323), and Delta ($368) offers the cheapest pricing from Knoxville to Seattle. These flights start at 71% lower than the current average price 3 months from now.

  • 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, January is the cheapest month in which you can book a flight from Knoxville to Seattle (average of $238). Flying from Knoxville to Seattle in June is currently the most expensive (average of $389). 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
SeaTac
Tukwila
Tacoma
Ocean Shores
Lakewood
Lynnwood
Lacey
Leavenworth
Renton
Olympia
Puyallup
Kent
Cle Elum
Chehalis
Kirkland
Issaquah
Aberdeen
Shoreline
Federal Way
Shelton

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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 August 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$178Average$330FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$323Average$626FlexibilityNo cancel feeOn-time71%
DeltaCheapest$368Average$669FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$438Average$695FlexibilityNo cancel feeOn-time69%

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