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Cheap flights from Knoxville to Seattle from $219

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Seattle departing on 12/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Knoxville to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:30 am - 11:56 amTYS-SEA
8h 26m1 stop
Multiple Airlines Logo
1:01 pm - 1:54 pmSEA-TYS
21h 53m1 stop
$248Multiple Airlines
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Thu, Nov 20 - Mon, Nov 24
Multiple Airlines Logo
6:30 am - 11:56 amTYS-SEA
8h 26m1 stop
Multiple Airlines Logo
9:32 am - 4:36 pmSEA-TYS
28h 04m2 stops
$275Multiple Airlines
Find Deal
Thu, Nov 20 - Sun, Nov 23
Frontier Logo
4:48 pm - 11:56 amTYS-SEA
22h 08m1 stop
Frontier Logo
1:01 pm - 3:53 pmSEA-TYS
23h 52m1 stop
$304Frontier
Find Deal
Fri, Nov 21 - Mon, Nov 24
Frontier Logo
4:48 pm - 1:22 pmTYS-SEA
23h 34m2 stops
Frontier Logo
1:01 pm - 3:53 pmSEA-TYS
23h 52m1 stop
$305Frontier
Find Deal
Fri, Nov 21 - Mon, Nov 24
American Airlines Logo
1:14 pm - 11:25 pmTYS-SEA
13h 11m1 stop
American Airlines Logo
12:14 am - 2:31 pmSEA-TYS
11h 17m1 stop
$360American Airlines
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Sat, Dec 13 - Wed, Dec 31
American Airlines Logo
1:14 pm - 11:25 pmTYS-SEA
13h 11m1 stop
American Airlines Logo
12:14 am - 2:31 pmSEA-TYS
11h 17m1 stop
$370American Airlines
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Sat, Dec 13 - Wed, Dec 31
Delta Logo
7:20 pm - 10:29 amTYS-SEA
18h 09m1 stop
Delta Logo
3:20 pm - 3:06 pmSEA-TYS
20h 46m1 stop
$425Delta
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Fri, Feb 27 - Tue, Mar 3
United Airlines Logo
4:25 pm - 9:12 pmTYS-SEA
7h 47m1 stop
United Airlines Logo
12:46 pm - 10:23 pmSEA-TYS
6h 37m1 stop
$432United Airlines
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Fri, Apr 24 - Sat, May 2
United Airlines Logo
9:40 am - 6:25 pmTYS-SEA
11h 45m2 stops
United Airlines Logo
7:00 am - 5:11 pmSEA-TYS
7h 11m1 stop
$442United Airlines
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Tue, Dec 9 - Wed, Dec 10
Delta Logo
10:05 am - 2:54 pmTYS-SEA
7h 49m1 stop
Delta Logo
4:55 pm - 9:13 amSEA-TYS
13h 18m2 stops
$446Delta
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Fri, Feb 27 - Tue, Mar 3

American Airlines flights from Knoxville to Seattle

Our best American Airlines deals on Knoxville to Seattle flight tickets
American Airlines
Dec 13
TYS1:14 pmKnoxville McGhee Tyson
13h 11m
1 stop
SEA11:25 pmSeattle/Tacoma Intl
Dec 31
SEA12:14 amSeattle/Tacoma Intl
11h 17m
1 stop
TYS2:31 pmKnoxville McGhee Tyson
$360
Find similar
American Airlines
Dec 13
TYS1:14 pmKnoxville McGhee Tyson
13h 11m
1 stop
SEA11:25 pmSeattle/Tacoma Intl
Dec 31
SEA12:14 amSeattle/Tacoma Intl
11h 17m
1 stop
TYS2:31 pmKnoxville McGhee Tyson
$370
Find similar
American Airlines
Dec 13
TYS1:14 pmKnoxville McGhee Tyson
13h 11m
1 stop
SEA11:25 pmSeattle/Tacoma Intl
Jan 2
SEA12:14 amSeattle/Tacoma Intl
12h 42m
1 stop
TYS3:56 pmKnoxville McGhee Tyson
$391
Find similar

Delta flights from Knoxville to Seattle

Our best Delta deals on Knoxville to Seattle flight tickets
Delta
Feb 27
TYS7:20 pmKnoxville McGhee Tyson
18h 09m
1 stop
SEA10:29 amSeattle/Tacoma Intl
Mar 3
SEA3:20 pmSeattle/Tacoma Intl
20h 46m
1 stop
TYS3:06 pmKnoxville McGhee Tyson
$425
Find similar
Delta
Feb 27
TYS10:05 amKnoxville McGhee Tyson
7h 49m
1 stop
SEA2:54 pmSeattle/Tacoma Intl
Mar 3
SEA4:55 pmSeattle/Tacoma Intl
13h 18m
2 stops
TYS9:13 amKnoxville McGhee Tyson
$446
Find similar
Delta
Feb 27
TYS10:05 amKnoxville McGhee Tyson
7h 49m
1 stop
SEA2:54 pmSeattle/Tacoma Intl
Mar 3
SEA1:45 pmSeattle/Tacoma Intl
16h 28m
1 stop
TYS9:13 amKnoxville McGhee Tyson
$452
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated October 30, 2025.
Use the filters below to find and compare flights from Knoxville to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 11/20

6:30 am-11:56 am

1 stop8h 26m

Seattle/Tacoma Intl

Mon 11/24

1:01 pm-1:54 pm

1 stop21h 53m

$248

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 11/20

6:30 am-11:56 am

1 stop8h 26m

Seattle/Tacoma Intl

Sun 11/23

9:32 am-4:36 pm

2 stops28h 04m

$275

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 11/21

4:48 pm-11:56 am

1 stop22h 08m

Seattle/Tacoma Intl

Mon 11/24

1:01 pm-3:53 pm

1 stop23h 52m

$304

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 11/21

4:48 pm-1:22 pm

2 stops23h 34m

Seattle/Tacoma Intl

Mon 11/24

1:01 pm-3:53 pm

1 stop23h 52m

$305

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sat 12/13

1:14 pm-11:25 pm

1 stop13h 11m

Seattle/Tacoma Intl

Wed 12/31

12:14 am-2:31 pm

1 stop11h 17m

$360

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sat 12/13

1:14 pm-11:25 pm

1 stop13h 11m

Seattle/Tacoma Intl

Wed 12/31

12:14 am-2:31 pm

1 stop11h 17m

$370

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 2/27

7:20 pm-10:29 am

1 stop18h 09m

Seattle/Tacoma Intl

Tue 3/3

3:20 pm-3:06 pm

1 stop20h 46m

$425

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 4/24

4:25 pm-9:12 pm

1 stop7h 47m

Seattle/Tacoma Intl

Sat 5/2

12:46 pm-10:23 pm

1 stop6h 37m

$432

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Tue 12/9

9:40 am-6:25 pm

2 stops11h 45m

Seattle/Tacoma Intl

Wed 12/10

7:00 am-5:11 pm

1 stop7h 11m

$442

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Fri 2/27

10:05 am-2:54 pm

1 stop7h 49m

Seattle/Tacoma Intl

Tue 3/3

4:55 pm-9:13 am

2 stops13h 18m

$446

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Knoxville to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Seattle?

In general, August is the cheapest month to fly from Knoxville to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $415. If you don’t want to visit Seattle in August, then you should wait until September to fly from Knoxville, when ticket prices are also cheap, with an average price of $523.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Knoxville is on a Friday. momondo users have found tickets for Friday departures for as low as $596. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from Knoxville because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $746.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Knoxville in the evening is the least expensive time of day to depart. momondo users have found prices as low as $327 when looking at flights departing in the evening. Flights to Seattle are more costly at noon, with an average ticket price of $697. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Knoxville when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $629 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Knoxville for as low as $532 on momondo.

How have Knoxville to Seattle flight prices changed over time?

As of October 2025, prices for Knoxville to Seattle flights are approximately 90% more expensive when compared to flights at the same time last year.

When to book flights from Knoxville to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Knoxville to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Knoxville to Seattle (TYS to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Knoxville to Seattle

Direct flights

None
There are no direct flights from Knoxville to Seattle. There are no popular flight routes from Knoxville to Seattle.
Search flight deals

  • How far is Knoxville McGhee Tyson to Seattle/Tacoma Intl by plane?

    The distance between Knoxville McGhee Tyson and Seattle/Tacoma Intl is about 2108.9 mi. Flights usually cover this in 7h 19m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Knoxville McGhee Tyson Airport to Seattle/Tacoma Intl Airport are updated daily.

  • How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Knoxville McGhee Tyson Airport to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Seattle/Tacoma Intl Airport.

  • What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

    The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular airline from Knoxville to Seattle?

Best airlines flying from Knoxville to Seattle

Compare and see reviews for airlines that fly from Knoxville to Seattle with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $248Free CancellationRating
5.8
3,122 reviews
Search Frontier flights
American AirlinesPriceFrom $345Free CancellationRating
7.2
11,035 reviews
Search American Airlines flights
DeltaPriceFrom $368Free CancellationRating
7.9
7,998 reviews
Search Delta flights
United AirlinesPriceFrom $416Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights

Traveling to a place near Seattle?

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

Why use momondo?

Why should I use momondo to find a flight deal from Knoxville to Seattle?

Finding the right flight to Seattle from Knoxville is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Seattle quick and easy, saving you time and money.

Can I find flights from Knoxville to Seattle with flexible booking policies on momondo?

Yes. All flights to Seattle from Knoxville on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Knoxville to Seattle?

momondo provides multiple filters to help you find the best flight to Seattle from Knoxville. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Knoxville to Seattle right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Knoxville to Seattle now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seattle and let you know when they change.

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