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$142+ 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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — SEA
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$301
(FlightHub)

One-way from

$142
(Mytrip)

Popular in

February

Cheapest in

August

Average price

$711
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. 4% potential increase in price ($33 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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
Sat 8/3012:40 pmSEA - TYS
1 stop28h 01mFrontier
Deal found 6/10$301
This American Airlines deal was found by Cheapflights users on 6/10. 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.
Tue 7/152:48 pmTYS - SEA
1 stop8h 53mAmerican Airlines
Thu 7/2412:59 amSEA - TYS
1 stop7h 42mAmerican Airlines
Deal found 6/10$309
This Mytrip deal was found by Cheapflights users on 6/10. 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 7/411:01 amTYS - SEA
1 stop14h 46mMultiple Airlines
Sun 7/1311:59 pmSEA - TYS
2 stops13h 48mMultiple Airlines
Deal found 6/10$386
This United Airlines deal was found by Cheapflights users on 6/11. 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 8/87:35 pmTYS - SEA
1 stop8h 21mUnited Airlines
Sat 8/1611:48 pmSEA - TYS
1 stop7h 29mUnited Airlines
Deal found 6/11$393
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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.
Tue 9/22:23 pmTYS - SEA
1 stop8h 57mAlaska Airlines
Fri 9/512:33 amSEA - TYS
1 stop9h 39mAlaska Airlines
Deal found 6/9$434
This Delta deal was found by Cheapflights users on 6/10. 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.
Fri 6/137:46 amTYS - SEA
1 stop9h 39mDelta
Thu 6/1911:40 pmSEA - TYS
1 stop8h 28mDelta
Deal found 6/10$499

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 June 12, 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 8/21

8:36 pm-9:34 am

1 stop15h 58m

Seattle/Tacoma Intl

Sat 8/30

12:40 pm-7:41 pm

1 stop28h 01m

$301

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Tue 7/15

2:48 pm-8:41 pm

1 stop8h 53m

Seattle/Tacoma Intl

Thu 7/24

12:59 am-11:41 am

1 stop7h 42m

$309

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 7/4

11:01 am-10:47 pm

1 stop14h 46m

Seattle/Tacoma Intl

Sun 7/13

11:59 pm-4:47 pm

2 stops13h 48m

$386

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 8/8

7:35 pm-12:56 am

1 stop8h 21m

Seattle/Tacoma Intl

Sat 8/16

11:48 pm-10:17 am

1 stop7h 29m

$393

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 9/4

7:30 am-3:15 pm

1 stop10h 45m

Seattle/Tacoma Intl

Mon 9/8

12:58 am-1:12 pm

1 stop9h 14m

$409

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 7/11

6:15 pm-11:56 pm

1 stop8h 41m

Seattle/Tacoma Intl

Sat 7/19

7:30 pm-11:44 pm

1 stop25h 14m

$512

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 7/4

11:01 am-10:47 pm

1 stop14h 46m

$142

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 8/28

8:36 pm-12:34 am

1 stop6h 58m

$185

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Wed 8/13

5:45 am-6:56 pm

2 stops16h 11m

$243

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Tue 8/12

6:13 am-8:02 pm

2 stops16h 49m

$280

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 12 results
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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 June 9, 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 $391). 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 June 12, 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.

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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 June 12, 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

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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
3,295 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Food

7.1

Boarding

8.1

Comfort

7.8

Overall

8.0

Entertainment

7.1

Crew

8.5

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 ($301), American Airlines ($309), and United Airlines ($393) offers the cheapest pricing from Knoxville to Seattle. These flights start at 54% 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 $185 on Frontier. Other airlines that offer cheap prices include Delta from $243 and American Airlines from $280 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 $391). 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
Federal Way
Lynnwood
Olympia
Shoreline
Kent
Cle Elum
Centralia
Kirkland
Aberdeen
Renton
Shelton
Silverdale
Issaquah

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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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$178Average$287FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$380Average$638FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$497Average$701FlexibilityNo cancel feeOn-time69%
DeltaCheapest$521Average$689FlexibilityNo cancel feeOn-timeN/A

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