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Cheap flights from Knoxville to Seattle from $178

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 9/14. 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
2:47 pm - 10:39 am
TYS
-
SEA
22h 52m
1 stop
Multiple Airlines Logo
7:41 pm - 1:49 pm
SEA
-
TYS
15h 08m
1 stop
$309Multiple Airlines
Mon, Aug 10 - Wed, Aug 19
Multiple Airlines Logo
2:47 pm - 10:39 am
TYS
-
SEA
22h 52m
1 stop
Multiple Airlines Logo
8:13 pm - 1:49 pm
SEA
-
TYS
14h 36m
2 stops
$317Multiple Airlines
Mon, Aug 10 - Wed, Aug 19
Multiple Airlines Logo
7:00 am - 9:49 am
TYS
-
SEA
29h 49m
1 stop
Multiple Airlines Logo
7:41 pm - 1:49 pm
SEA
-
TYS
15h 08m
1 stop
$338Multiple Airlines
Sun, Aug 9 - Wed, Aug 19
Multiple Airlines Logo
2:47 pm - 10:39 am
TYS
-
SEA
22h 52m
1 stop
Multiple Airlines Logo
8:12 pm - 1:57 pm
SEA
-
TYS
14h 45m
1 stop
$339Multiple Airlines
Mon, Aug 10 - Thu, Aug 13
Multiple Airlines Logo
7:00 am - 6:52 pm
TYS
-
SEA
38h 52m
2 stops
Multiple Airlines Logo
7:41 pm - 1:49 pm
SEA
-
TYS
15h 08m
1 stop
$344Multiple Airlines
Thu, Aug 13 - Wed, Aug 19
Multiple Airlines Logo
2:47 pm - 10:35 am
TYS
-
SEA
22h 48m
1 stop
Multiple Airlines Logo
7:41 pm - 1:49 pm
SEA
-
TYS
15h 08m
1 stop
$345Multiple Airlines
Mon, Aug 17 - Sat, Aug 22
Multiple Airlines Logo
7:00 am - 9:49 am
TYS
-
SEA
29h 49m
1 stop
Multiple Airlines Logo
8:13 pm - 1:49 pm
SEA
-
TYS
14h 36m
2 stops
$346Multiple Airlines
Sun, Aug 9 - Wed, Aug 19
Multiple Airlines Logo
2:47 pm - 10:35 am
TYS
-
SEA
22h 48m
1 stop
Multiple Airlines Logo
7:41 pm - 7:37 pm
SEA
-
TYS
20h 56m
1 stop
$353Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
2:47 pm - 10:35 am
TYS
-
SEA
22h 48m
1 stop
Multiple Airlines Logo
7:41 pm - 7:37 pm
SEA
-
TYS
20h 56m
1 stop
$360Multiple Airlines
Mon, Aug 17 - Tue, Aug 25
Multiple Airlines Logo
8:30 am - 9:48 am
TYS
-
SEA
52h 18m
2 stops
Multiple Airlines Logo
7:41 pm - 1:44 pm
SEA
-
TYS
15h 03m
1 stop
$362Multiple Airlines
Mon, Aug 24 - Wed, Sep 2

Frontier flights from Knoxville to Seattle

Our best Frontier deals on Knoxville to Seattle flight tickets
Frontier
Aug 12
TYS8:32 pmKnoxville McGhee Tyson
16h 17m
1 stop
SEA9:49 amSeattle/Tacoma Intl
Aug 16
SEA7:41 pmSeattle/Tacoma Intl
20h 55m
1 stop
TYS7:36 pmKnoxville McGhee Tyson
$382
Frontier
Jun 22
TYS8:32 pmKnoxville McGhee Tyson
16h 16m
1 stop
SEA9:48 amSeattle/Tacoma Intl
Jun 30
SEA7:41 pmSeattle/Tacoma Intl
20h 56m
1 stop
TYS7:37 pmKnoxville McGhee Tyson
$383
Frontier
Jul 22
TYS8:32 pmKnoxville McGhee Tyson
20h 47m
1 stop
SEA2:19 pmSeattle/Tacoma Intl
Aug 2
SEA7:41 pmSeattle/Tacoma Intl
20h 55m
1 stop
TYS7:36 pmKnoxville McGhee Tyson
$403

United Airlines flights from Knoxville to Seattle

Our best United Airlines deals on Knoxville to Seattle flight tickets
United Airlines
Aug 19
TYS4:50 pmKnoxville McGhee Tyson
7h 25m
1 stop
SEA9:15 pmSeattle/Tacoma Intl
Sep 1
SEA7:00 amSeattle/Tacoma Intl
6h 58m
1 stop
TYS4:58 pmKnoxville McGhee Tyson
$389
United Airlines
Oct 24
TYS10:42 amKnoxville McGhee Tyson
10h 04m
2 stops
SEA5:46 pmSeattle/Tacoma Intl
Oct 31
SEA2:15 pmSeattle/Tacoma Intl
6h 59m
1 stop
TYS12:14 amKnoxville McGhee Tyson
$420
United Airlines
May 29
TYS6:30 amKnoxville McGhee Tyson
8h 08m
1 stop
SEA11:38 amSeattle/Tacoma Intl
Jun 4
SEA11:20 pmSeattle/Tacoma Intl
8h 22m
1 stop
TYS10:42 amKnoxville McGhee Tyson
$436

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 May 18, 2026.
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

Cheapest round-trip

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 8/10

2:47 pm-10:39 am

1 stop22h 52m

Seattle/Tacoma Intl

Wed 8/19

7:41 pm-1:49 pm

1 stop15h 08m

$309
Quickest round-trip

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 8/10

2:47 pm-10:39 am

1 stop22h 52m

Seattle/Tacoma Intl

Wed 8/19

8:13 pm-1:49 pm

2 stops14h 36m

$317

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sun 8/9

7:00 am-9:49 am

1 stop29h 49m

Seattle/Tacoma Intl

Wed 8/19

7:41 pm-1:49 pm

1 stop15h 08m

$338

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 8/10

2:47 pm-10:39 am

1 stop22h 52m

Seattle/Tacoma Intl

Thu 8/13

8:12 pm-1:57 pm

1 stop14h 45m

$339

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 8/13

7:00 am-6:52 pm

2 stops38h 52m

Seattle/Tacoma Intl

Wed 8/19

7:41 pm-1:49 pm

1 stop15h 08m

$344

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 8/17

2:47 pm-10:35 am

1 stop22h 48m

Seattle/Tacoma Intl

Sat 8/22

7:41 pm-1:49 pm

1 stop15h 08m

$345

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sun 8/9

7:00 am-9:49 am

1 stop29h 49m

Seattle/Tacoma Intl

Wed 8/19

8:13 pm-1:49 pm

2 stops14h 36m

$346

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 8/17

2:47 pm-10:35 am

1 stop22h 48m

Seattle/Tacoma Intl

Tue 8/25

7:41 pm-7:37 pm

1 stop20h 56m

$353

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 8/17

2:47 pm-10:35 am

1 stop22h 48m

Seattle/Tacoma Intl

Tue 8/25

7:41 pm-7:37 pm

1 stop20h 56m

$360

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Mon 8/24

8:30 am-9:48 am

2 stops52h 18m

Seattle/Tacoma Intl

Wed 9/2

7:41 pm-1:44 pm

1 stop15h 03m

$362

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 typical price of a round-trip flight between Knoxville and Seattle?

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 $412. If you don’t want to visit Seattle in August, then you should wait until November to fly from Knoxville, when ticket prices are also cheap, with an average price of $442.

How far in advance should I book a flight from Knoxville 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 $538 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 $408 on momondo.

How have Knoxville to Seattle flight prices changed over time?

As of May 2026, prices for Knoxville to Seattle flights are approximately 67% 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

Fastest flight time

7h 14m

Direct flights

None
The fastest flight from Knoxville to Seattle takes 7h 14m
There are no direct flights from Knoxville to Seattle. There are no popular flight routes from Knoxville to Seattle.
Search flight deals

Frequently asked questions about flying from Knoxville to Seattle

  • 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 14m, 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 $179Free CancellationRating
5.6
2,946 reviews
Search Frontier flights
American AirlinesPriceFrom $308Free CancellationRating
7.1
11,648 reviews
Search American Airlines flights
DeltaPriceFrom $308Free CancellationRating
7.9
8,447 reviews
Search Delta flights
United AirlinesPriceFrom $371Free CancellationRating
7.4
9,736 reviews
Search United Airlines flights

  • United Airlines Flights From Knoxville to Seattle

    United Airlines flight deals from Knoxville to Seattle start from $371 round-trip. Over the 3 United Airlines flights for this route in a normal week, average airfare is usually $523 round-trip - but some users have found much cheaper deals with momondo.

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
Redmond
Kent
Tukwila
Puyallup
Marysville
Lakewood
Cle Elum
Federal Way
Centralia
Fife
Westport
Shoreline
Tumwater

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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