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$128+ 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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — SEA
Jul 7 — Jul 141
Mon 7/7
Mon 7/14
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 October, booked 6 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 July 2, 2025.

Round-trip from

$180
(Priceline)

One-way from

$130
(FlightHub)

Popular in

February

Cheapest in

August

Average price

$632
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. 5% potential increase in price ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 2, 2025.

This Priceline deal was found by Cheapflights users on 7/1. 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 9/188:26 pmTYS - SEA
1 stop7h 04mFrontier
Mon 9/226:12 amSEA - TYS
1 stop10h 29mFrontier
Deal found 7/1$180
This Delta deal was found by Cheapflights users on 6/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/216:03 pmTYS - SEA
1 stop8h 51mDelta
Wed 8/276:00 amSEA - TYS
1 stop9h 22mDelta
Deal found 6/30$309
This United Airlines deal was found by Cheapflights users on 6/29. 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 11/87:00 amTYS - SEA
2 stops9h 54mUnited Airlines
Mon 11/1711:50 pmSEA - TYS
1 stop7h 15mUnited Airlines
Deal found 6/29$314
This American Airlines deal was found by Cheapflights users on 7/1. 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.
Sat 11/83:00 pmTYS - SEA
1 stop8h 51mAmerican Airlines
Sat 11/151:24 amSEA - TYS
1 stop6h 23mAmerican Airlines
Deal found 7/1$339
This Mytrip deal was found by Cheapflights users on 6/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/111:01 amTYS - SEA
1 stop14h 49mMultiple Airlines
Sat 8/95:30 pmSEA - TYS
2 stops17h 51mMultiple Airlines
Deal found 6/30$354
This Alaska Airlines deal was found by Cheapflights users on 7/1. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/222:23 pmTYS - SEA
1 stop8h 57mAlaska Airlines
Sat 8/236:00 amSEA - TYS
1 stop8h 49mAlaska Airlines
Deal found 7/1$409

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 July 2, 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

Thu 9/18

8:26 pm-12:30 am

1 stop7h 04m

Seattle/Tacoma Intl

Mon 9/22

6:12 am-7:41 pm

1 stop10h 29m

$180

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 8/21

6:03 pm-11:54 pm

1 stop8h 51m

Seattle/Tacoma Intl

Wed 8/27

6:00 am-6:22 pm

1 stop9h 22m

$309

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 8/1

11:01 am-10:50 pm

1 stop14h 49m

Seattle/Tacoma Intl

Sat 8/9

5:30 pm-2:21 pm

2 stops17h 51m

$354

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Wed 9/3

7:00 am-11:31 am

1 stop7h 31m

Seattle/Tacoma Intl

Sat 9/6

5:02 am-5:00 pm

2 stops8h 58m

$370

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Tue 7/29

6:22 pm-12:43 am

1 stop9h 21m

Seattle/Tacoma Intl

Wed 8/6

12:46 am-12:26 pm

1 stop8h 40m

$384

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 8/22

2:23 pm-8:20 pm

1 stop8h 57m

Seattle/Tacoma Intl

Mon 8/25

12:58 am-11:30 am

1 stop7h 32m

$409

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sun 8/10

5:25 pm-12:34 am

1 stop10h 09m

$128

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Tue 7/22

4:55 pm-4:25 pm

3 stops26h 30m

$194

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Tue 8/19

6:36 am-12:25 pm

1 stop8h 49m

$231

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Tue 8/19

7:00 am-10:59 pm

2 stops18h 59m

$304

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

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 June 27, 2025.

The best time to book flights from Knoxville to Seattle is 6 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 July is currently the most expensive (average of $390). 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 July 2, 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.

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 July 2, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Delta, and United 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,983 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Frontier
5.9
Fair
3,290 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 ($180), Delta ($309), and United Airlines ($314) offers the cheapest pricing from Knoxville to Seattle. These flights start at 72% 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 $130 on Frontier. Other airlines that offer cheap prices include Delta from $257 and United Airlines from $339 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, 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 July is currently the most expensive (average of $390). 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 Knoxville?

Book flights to Knoxville if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Ocean Shores
Lacey
Leavenworth
Lynnwood
Renton
Olympia
Shoreline
Puyallup
Cle Elum
Centralia
Kent
Federal Way
Chehalis
Kirkland
Aberdeen
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 July 2, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$178Average$285FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$376Average$626FlexibilityNo cancel feeOn-time71%
DeltaCheapest$475Average$690FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$483Average$696FlexibilityNo cancel feeOn-time69%

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