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Cheap flights from Knoxville to Seattle from $130

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 10/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Knoxville to Seattle

Cheap round-trip flights

Frontier Logo
8:35 pm - 12:30 amTYS-SEA
6h 55m1 stop
Frontier Logo
6:12 am - 7:50 pmSEA-TYS
10h 38m1 stop
$155Frontier
Find Deal
Mon, Sep 29 - Thu, Oct 2
Frontier Logo
7:17 pm - 12:13 pmTYS-SEA
19h 56m1 stop
Frontier Logo
12:58 pm - 6:22 pmSEA-TYS
26h 24m1 stop
$172Frontier
Find Deal
Thu, Oct 30 - Wed, Nov 5
Multiple Airlines Logo
4:47 pm - 10:56 amTYS-SEA
21h 09m1 stop
Multiple Airlines Logo
7:05 pm - 1:11 pmSEA-TYS
15h 06m1 stop
$216Multiple Airlines
Find Deal
Thu, Dec 4 - Sat, Dec 13
Frontier Logo
7:17 pm - 9:18 amTYS-SEA
17h 01m2 stops
Frontier Logo
12:58 pm - 6:22 pmSEA-TYS
26h 24m1 stop
$220Frontier
Find Deal
Thu, Oct 30 - Wed, Nov 5
Multiple Airlines Logo
7:17 pm - 12:13 pmTYS-SEA
19h 56m1 stop
Multiple Airlines Logo
12:58 pm - 2:33 pmSEA-TYS
22h 35m1 stop
$223Multiple Airlines
Find Deal
Thu, Oct 30 - Sat, Nov 1
Multiple Airlines Logo
6:30 am - 7:51 pmTYS-SEA
40h 21m2 stops
Multiple Airlines Logo
7:05 pm - 3:52 pmSEA-TYS
17h 47m1 stop
$244Multiple Airlines
Find Deal
Sun, Dec 7 - Sun, Dec 14
American Airlines Logo
1:14 pm - 11:38 pmTYS-SEA
13h 24m1 stop
American Airlines Logo
12:14 am - 3:58 pmSEA-TYS
12h 44m1 stop
$372American Airlines
Find Deal
Sat, Dec 13 - Wed, Dec 31
American Airlines Logo
1:14 pm - 11:38 pmTYS-SEA
13h 24m1 stop
American Airlines Logo
12:38 am - 5:12 pmSEA-TYS
13h 34m1 stop
$387American Airlines
Find Deal
Sat, Dec 6 - Fri, Dec 12
Delta Logo
8:15 am - 2:01 pmTYS-SEA
8h 46m1 stop
Delta Logo
7:25 am - 11:22 pmSEA-TYS
12h 57m2 stops
$401Delta
Find Deal
Wed, Oct 29 - Tue, Nov 4
Delta Logo
6:40 am - 4:30 pmTYS-SEA
12h 50m2 stops
Delta Logo
7:25 am - 11:22 pmSEA-TYS
12h 57m2 stops
$426Delta
Find Deal
Thu, Oct 30 - Tue, Nov 4

Frontier flights from Knoxville to Seattle

Our best Frontier deals on Knoxville to Seattle flight tickets
Frontier
Sep 29
TYS8:35 pmKnoxville McGhee Tyson
6h 55m
1 stop
SEA12:30 amSeattle/Tacoma Intl
Oct 2
SEA6:12 amSeattle/Tacoma Intl
10h 38m
1 stop
TYS7:50 pmKnoxville McGhee Tyson
$155
Find similar
Frontier
Oct 30
TYS7:17 pmKnoxville McGhee Tyson
19h 56m
1 stop
SEA12:13 pmSeattle/Tacoma Intl
Nov 5
SEA12:58 pmSeattle/Tacoma Intl
26h 24m
1 stop
TYS6:22 pmKnoxville McGhee Tyson
$172
Find similar
Frontier
Oct 30
TYS7:17 pmKnoxville McGhee Tyson
17h 01m
2 stops
SEA9:18 amSeattle/Tacoma Intl
Nov 5
SEA12:58 pmSeattle/Tacoma Intl
26h 24m
1 stop
TYS6:22 pmKnoxville McGhee Tyson
$220
Find similar

United Airlines flights from Knoxville to Seattle

Our best United Airlines deals on Knoxville to Seattle flight tickets
United Airlines
Sep 30
TYS4:40 pmKnoxville McGhee Tyson
7h 54m
1 stop
SEA9:34 pmSeattle/Tacoma Intl
Oct 4
SEA11:10 amSeattle/Tacoma Intl
9h 33m
2 stops
TYS11:43 pmKnoxville McGhee Tyson
$528
Find similar
United Airlines
Sep 30
TYS10:51 amKnoxville McGhee Tyson
7h 54m
1 stop
SEA3:45 pmSeattle/Tacoma Intl
Oct 3
SEA11:10 amSeattle/Tacoma Intl
9h 33m
2 stops
TYS11:43 pmKnoxville McGhee Tyson
$542
Find similar
United Airlines
Sep 26
TYS10:51 amKnoxville McGhee Tyson
7h 54m
1 stop
SEA3:45 pmSeattle/Tacoma Intl
Sep 30
SEA10:50 amSeattle/Tacoma Intl
9h 00m
1 stop
TYS10:50 pmKnoxville McGhee Tyson
$550
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 September 16, 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

Mon 9/29

8:35 pm-12:30 am

1 stop6h 55m

Seattle/Tacoma Intl

Thu 10/2

6:12 am-7:50 pm

1 stop10h 38m

$155

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 10/30

7:17 pm-12:13 pm

1 stop19h 56m

Seattle/Tacoma Intl

Wed 11/5

12:58 pm-6:22 pm

1 stop26h 24m

$172

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 12/4

4:47 pm-10:56 am

1 stop21h 09m

Seattle/Tacoma Intl

Sat 12/13

7:05 pm-1:11 pm

1 stop15h 06m

$216

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 10/30

7:17 pm-9:18 am

2 stops17h 01m

Seattle/Tacoma Intl

Wed 11/5

12:58 pm-6:22 pm

1 stop26h 24m

$220

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 10/30

7:17 pm-12:13 pm

1 stop19h 56m

Seattle/Tacoma Intl

Sat 11/1

12:58 pm-2:33 pm

1 stop22h 35m

$223

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sun 12/7

6:30 am-7:51 pm

2 stops40h 21m

Seattle/Tacoma Intl

Sun 12/14

7:05 pm-3:52 pm

1 stop17h 47m

$244

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sat 12/13

1:14 pm-11:38 pm

1 stop13h 24m

Seattle/Tacoma Intl

Wed 12/31

12:14 am-3:58 pm

1 stop12h 44m

$372

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Sat 12/6

1:14 pm-11:38 pm

1 stop13h 24m

Seattle/Tacoma Intl

Fri 12/12

12:38 am-5:12 pm

1 stop13h 34m

$387

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Wed 10/29

8:15 am-2:01 pm

1 stop8h 46m

Seattle/Tacoma Intl

Tue 11/4

7:25 am-11:22 pm

2 stops12h 57m

$401

KnoxvilleSeattle

TYS - SEA

TYSSEA

Knoxville McGhee Tyson

Thu 10/30

6:40 am-4:30 pm

2 stops12h 50m

Seattle/Tacoma Intl

Tue 11/4

7:25 am-11:22 pm

2 stops12h 57m

$426

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 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 $630 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 September 2025, prices for Knoxville to Seattle flights are approximately 172% 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 6h 55m, 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 $178Free CancellationRating
5.8
3,174 reviews
Search Frontier flights
American AirlinesPriceFrom $349Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $368Free CancellationRating
7.9
7,957 reviews
Search Delta flights
United AirlinesPriceFrom $416Free CancellationRating
7.4
8,924 reviews
Search United Airlines flights

Traveling to a place near Seattle?

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