SEA - TYS

$135 Find Cheap Flights from Seattle to Knoxville

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Knoxville departing on 4/19. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Knoxville

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Knoxville, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Knoxville, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$335
Overall average: $561
Frontier
Wed 4/22Sun 4/26
SEA - TYS • 1 stop
Cheapest one-way
$135
Typical prices: $272-$456
Multiple Airlines
Sun 4/19
SEA - TYS • 1 stop
Top airlines
Frontier
Cheapest • from $335 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 13% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
August
Cheapest • 16% price drop
May
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Seattle to Knoxville (SEA-TYS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Knoxville that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Knoxville

Wed, Apr 22 - Sun, Apr 26
Frontier Logo
6:57 pm - 3:33 pm
SEA
-
TYS
17h 36m
1 stop
Frontier Logo
4:28 pm - 9:27 am
TYS
-
SEA
19h 59m
1 stop
$335Frontier
Mon, Mar 9 - Mon, Mar 16
Multiple Airlines Logo
10:08 pm - 5:34 pm
SEA
-
TYS
16h 26m
1 stop
Multiple Airlines Logo
8:58 am - 5:09 pm
TYS
-
SEA
35h 11m
2 stops
$337Multiple Airlines
Wed, Apr 22 - Sun, Apr 26
Multiple Airlines Logo
6:57 pm - 3:33 pm
SEA
-
TYS
17h 36m
1 stop
Multiple Airlines Logo
11:27 am - 9:27 am
TYS
-
SEA
25h 00m
2 stops
$341Multiple Airlines
Wed, Mar 11 - Wed, Mar 18
United Airlines Logo
5:00 am - 3:02 pm
SEA
-
TYS
7h 02m
1 stop
United Airlines Logo
4:18 pm - 10:59 pm
TYS
-
SEA
9h 41m
1 stop
$359United Airlines
Wed, Apr 15 - Wed, Apr 29
United Airlines Logo
5:00 am - 4:52 pm
SEA
-
TYS
8h 52m
2 stops
United Airlines Logo
5:48 pm - 10:37 pm
TYS
-
SEA
7h 49m
1 stop
$360United Airlines
Wed, Apr 1 - Mon, Apr 6
United Airlines Logo
11:59 pm - 10:08 am
SEA
-
TYS
7h 09m
1 stop
United Airlines Logo
5:48 pm - 12:19 am
TYS
-
SEA
9h 31m
1 stop
$372United Airlines
Wed, Mar 11 - Wed, Mar 25
Southwest Logo
5:30 am - 9:10 pm
SEA
-
TYS
12h 40m
2 stops
Southwest Logo
2:25 pm - 12:20 am
TYS
-
SEA
12h 55m
2 stops
$375Southwest
Wed, Apr 22 - Sun, Apr 26
Frontier Logo
6:57 pm - 3:33 pm
SEA
-
TYS
17h 36m
1 stop
Frontier Logo
4:28 pm - 9:27 am
TYS
-
SEA
19h 59m
1 stop
$379Frontier
Wed, Mar 11 - Mon, Mar 16
Delta Logo
6:00 am - 4:43 pm
SEA
-
TYS
7h 43m
1 stop
Delta Logo
6:38 pm - 11:57 pm
TYS
-
SEA
8h 19m
1 stop
$385Delta
Thu, Apr 23 - Sun, Apr 26
Multiple Airlines Logo
9:35 pm - 10:51 pm
SEA
-
TYS
22h 16m
1 stop
Multiple Airlines Logo
4:28 pm - 9:27 am
TYS
-
SEA
19h 59m
1 stop
$405Multiple Airlines
Booking Insights

KAYAK's insights & trends for Seattle to Knoxville flights

Get data-powered insights and trends into flights from Seattle to Knoxville to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Seattle to Knoxville?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Knoxville, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Knoxville is August, where tickets cost $460 (return) on average. On the other hand, the most expensive months are March and June, where the average cost of round-trip tickets is $718 and $590 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Knoxville, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Knoxville, you should book around 4 weeks before departure, which saves you about 13% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$135
Best time to beat the crowds with an average 5% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Seattle to Knoxville

When to book flights from Seattle to Knoxville

Are your dates flexible? Find out the best times to travel from Seattle to Knoxville based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Knoxville

  • Which kid-friendly options does United Airlines provide on flights from Seattle to Knoxville?

    United Airlines offers a range of kid-friendly options on flights from Seattle to Knoxville, ensuring an enjoyable journey for young travelers. Children can enjoy a variety of entertainment choices, including kid-friendly movies, TV shows, and games on personal seat back screens. Additionally, the airline offers activity kits that contain coloring books, games, and puzzles to keep children engaged during the flight.

  • Which American Airlines layovers are common on flights from Seattle to Knoxville?

    Common layovers on flights from Seattle to Knoxville with American Airlines may include cities such as Dallas-Fort Worth, Charlotte, and Chicago. These layovers often provide convenient connections for passengers traveling between the two cities. For instance, passengers may have a layover in Dallas-Fort Worth International Airport, Charlotte Douglas International Airport, or Chicago O'Hare International Airport before continuing their journey to Knoxville.

  • American Airlines uses which lounges for flights from Seattle to Knoxville?

    American Airlines offers access to several lounges for passengers flying from Seattle to Knoxville. One example is the American Airlines Admirals Club at Seattle-Tacoma International Airport. Another option is the Admirals Club at Knoxville's McGhee Tyson Airport, providing a relaxing environment before the flight. These lounges enhance the overall travel experience for American Airlines' customers on this route.

  • Which ground transportation means can I use from the airport after my flight from Seattle to Knoxville?

    After your flight from Seattle to Knoxville, you can utilize numerous public transportation options from the airport. For instance, you can hop on the McGhee Tyson Airport shuttle service, which provides convenient connections to various destinations within Knoxville. Additionally, there are local bus services like KAT (Knoxville Area Transit) that offer affordable and accessible travel throughout the city.

  • What is the cheapest flight from Seattle to Knoxville?

    In the last 3 days, the lowest price for a flight from Seattle to Knoxville was $135 for a one-way ticket and $335 for a round-trip.

  • Do I need a passport to fly between Seattle and Knoxville?

    No

  • Which airports will I be using when flying from Seattle to Knoxville?

    Seattle and Knoxville are both served by 1 main airport. You will leave Seattle from Seattle/Tacoma Intl and will be arriving at Knoxville McGhee Tyson.

  • Which aircraft models fly most regularly from Seattle to Knoxville?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seattle to Knoxville?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Seattle and Knoxville, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Seattle to Knoxville, Alaska Airlines or Delta?

    The two airlines most popular with KAYAK users for flights from Seattle to Knoxville are Alaska Airlines and Delta. With an average price for the route of $776 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $579 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Seattle to Knoxville?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Knoxville.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Knoxville?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Knoxville from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Knoxville?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Knoxville with an airline and back to Seattle with another airline. Booking your flights between Seattle and TYS can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Knoxville?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Knoxville from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Seattle to Knoxville

  • United Airlines has specific pet restrictions for flights from Seattle (SEA) to Knoxville (TYS). Only cats and dogs are allowed as in-cabin pets, while other animals must be transported in the cargo hold. In-cabin pets must be small enough to fit comfortably in a carrier under the seat in front of you. The weight limit for pets in the cabin is typically 20 lbs., including the weight of the carrier.
  • Passengers flying United Airlines from Seattle to Knoxville can pre-select their seats. When booking their tickets or managing their reservations online, passengers have the option to choose their preferred seats. By pre-selecting seats, passengers can ensure their desired seating arrangements and enhance their travel experience with United Airlines.
  • United Airlines supports sustainable travel on flights from Seattle to Knoxville by implementing various eco-friendly initiatives. They utilize fuel-efficient aircraft, optimize flight routes to reduce fuel consumption, and encourage passengers to participate in their carbon offset program. By prioritizing sustainability, United Airlines strives to minimize their environmental impact and promote greener travel choices.
  • You can rent a car after your flight from Seattle to Knoxville. There are several rental companies available at Knoxville's McGhee Tyson Airport, including major brands like Hertz, Avis, Enterprise, Budget, and National Car Rental. These companies offer a range of vehicles to pick from, accommodating various budgets and preferences. Simply visit their respective counters at the airport to arrange your rental and explore Knoxville and its surroundings conveniently.
  • Frontier Airlines offers a range of in-flight entertainment amenities on their flights from Seattle to Knoxville, ensuring passengers have an enjoyable journey. Travelers can expect to find a variety of options, such as seat back screens with a selection of movies and TV shows, in-flight magazines to browse through, and even free internet connectivity for those who prefer to stream their own entertainment on personal devices.

Reviews of the top 5 airlines serving from Seattle to Knoxville

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Knoxville. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Knoxville? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 11878 reviews
8.5Crew
7.1Food
7.0Entertainment
7.8Comfort
8.1Boarding
Airline reviews

Impressed that Alaska Air(for our domestic flight) transferred our checked bags to EVA (for our international flights) so that we didn't have to handle them, & we just picked them up at our final destination.

8.0 ExcellentAnonymous, Feb 2026
SEA - PHX
Read more Alaska Airlines reviews

Impressed that Alaska Air(for our domestic flight) transferred our checked bags to EVA (for our international flights) so that we didn't have to handle them, & we just picked them up at our final destination.

I enjoyed the movie selection. I’m glad I saw ahead of time to bring personal ear buds. I don’t normally have them with me and airlines used to give them out.

man & woman back side flight attendant was very rude. I live in Seattle. I use a lot of time Alaska flights. I always like them for fact that my favorite airline employees very rude. It’s disappointing. .

Great experience, staff and crew were very professional, friendly and helpful!

I think Alaska should start including free meals on these longer trips.

Wheelchair assistance was excellent. I had a saver fare, but was given a seat in Premium. So very nice!! Extra legroom, complimentary beer. The flight crew was very nice and efficient. The gate agent in Seattle double checked to make sure I was able to board the plane all right while using my cane. I boarded first. So considerate! The flight was smooth, and right on time.

There is nothing critical to complain about but I would say the snacks are pretty bad Airline staff could be aggressive the way they move through the aisles and the plane I also got hustled for a small wallet size men bag and force the consolidated with my carry on item we're talking about a wallet size bag.

Departed on time and had an efficient boarding process. The inflight wifi was not working on one of the flights.

How can I review what was denied to me. Instead of offering to let me pay for the ticket I got booted of my flight with no way home and no choice but to purchase another ticket for 12 hours later. Filing a complaint with the DOT

From Las Vegas to Boise all went well. However, our flight was delayed in Boise and I missed my connecting flight from Seattle to Pasco. Moreover, the last flight to Pasco was full and I was booked on the 11:30 flight Sunday and given a hotel accommodation. However, I was scheduled to deliver the Sunday morning service at my church and needed to arrive no later than 10:00. Therefore, I booked a Delta flight scheduled to arrive in Pasco at 23:09. My piece of luggage checked in Las Vegas arrived in Pasco earlier today. I waited at the airport for over an hour last night to speak with an Alaska agent to no avail. I went back after church this morning in search of my piece of luggage and it could not be located. After waiting for 40 minutes to speak to the agent authorized to take my claim, he announced that he was closing the counter to assist on the flight line but not before providing me with a telephone number that would help me with filing my claim. Before I was able to make the call (due to other factors) I received a call from Alaska agent informing me that my luggage had just arrived and I am now waiting for it to be delivered. I deliberately took the more complicated route home to ensure that I would be home in plenty of time to prepare for myself for the Sunday service and accommodate my relatives’ needs. I believe the airport is undermanned given the number of flights coming in and going out. It was fiasco last night with three flights waiting for luggage and another flight landing within minutes. Today’s problems stemmed from a lack of cross training and a serious amount of cargo/baggage going out and too few people scheduled to cover.

Was forced to check in my small carry on, even though I informed the crew it has very fragile items inside

This was one of the worst flights I’ve been on in years. I upgraded to comfort and had such an uncomfortable experience. The person next to me was oversized - which I understand - however, they took up their space and mine. I could only use about 50% of my seat space to not be physically touching this person the entire flight and there was no spatial awareness. I also could not use the seat outlet because their body was obstructing it. It was very inconvenient. Their body kept touching me repeatedly during the flight and I felt very uncomfortable. To pay more for an upgraded space and then not even being able to use it was highly disappointing.

No wheel chair as requested at Atlanta arrival on first flight.

Only freetext wifi was available in flight; browsing WiFi required payment. Since the seats had no in flight entertainment, Delta should revisit this policy on this longer flight.

Only water, tea or coffee served midflight, even to comfort seating. Man next to me needed two seats and took up a portion of my seat and Delta did nothing.

The flight was great as well as the airline staff

First class and monitors weren’t working for mine & my husbands. Eventually fixed, but quite annoyed as we bought first class. Also, No foot rests.

Prior to takeoff, the pilot told us there was a possibility of not being able to land and going to Portland. Well that happened, we took off and then did 8 loops around Spokane before the pilot told us we ran out of fuel and had to go to Portland. So for a 35 minute flight we have now been on the plane for 3 hours (boarded at 6:50 am and landed in Portland at 10:30). Then, we just sat in Portland's airport with no updates of when we can start heading back. All of a sudden, our pilots and crew just left, leaving us stranded in a different city and state. We continued to sit in Portland until we finally got a new crew assigned and boarded the plane (This was from 10:30-2). We then sat on the plane for an additional hour before take off because they had to count us multiple times. We finally landed in Spokane at 3:55 PM. So a flight that should have taken at max an hour took us 10 hours and we missed the majority of the recruiting event we went for.

It was delayed but other than that it was great.

Got on the plane and sat there for an hour before departure.

Short flight, but no drink/snack service. The flights both going and coming were delayed.

Much better than Spirit. I was please by the easy fast check in and boarding

Everything was on time Will use united again for sure

Plane outlets in my row not working to charge phone. Staff response was, well it should be. Plug into seed for volume not working well. Had to find the sweet spot for plug in or it would shut off and on.

Fine not above and beyond as I had a connection that was delayed due to maintenance

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

I upgraded my seat and was promised it would be next to the emergency door for extra leg room and they said it was premium plus but it was at the back of the plane...same thing happened from Newark to Dubai

Everything except the food and entertainment. It was a great experience though

Bad food, bad service, cold cabin with no additional blankets when asked for (they told me they don’t provide additional blankets). I’m a frequent traveler and this is one of the worst companies I traveled with (by the way I thought that I booked my ticket with Lufthansa but I didn’t see that the flights were handled by United).

United Airlines is my preferred airlines and I am thankful for Gary who also help support me on the phone to switch my flight literally last min.

The flight was on time/early, attentive crew, and everything overall went smoothly. Disappointed that WIFI was not working for the flight.

One day, I do so hope for a gluten free snack! Seems like with the rest of the world FINALLY figuring out what gluten free is, American Airlines would too. Fingers crossed!!

The flight was significantly delayed for 6.5 hours because of snow. There was no communication once the plane returned to the gate regarding when the flight would resume. Other flights were departing while our flight was being unloaded for reasons unknown. Our flight also seemed out of the queue regarding further deicing, refueling, and waiting to Taxi to the runway.

Flight was on time and the meal and service were good.

Flight was delayed for 2 hours, then last minute the change to on time. The satélite location is far and a nightmare to get to.

This was a horrible experience. I’ve experienced several delays at this point and still not home. I was supposed to be home by 8:30 last night and here I sit at 7 am on a plane STILL unable to go home because of American Airlines.

Generally good. Flight left on time and the seats are comfortable. Plenty of space in front if you in you choose a comfort plus seat, completely worth spending the extra money given the amount of hours the flight lasts. The food tastes good but I would say it’s a the amount is too little. The crew was friendly and efficient. There was a some turbulence at different points into the flight. American Airlines has good deals to NZ if you book with plenty of time before you plan on going.

the plane was so hot!! the air-conditioning was barely blowing. The flight was delayed, and we had to sit on the hot plane before take off for an extended amount of time, waiting on international passengers. Would not have been so bad if it was not so hot. They said it would get better after take off, but it did not.

They are always late and seats was also not having working charger

We flew in first class. The crew did not offer drinks before the flight took off, but they treated us well during the flight. The food was excellent. There was actually too much food served, but it was nice to have all the options.

There was no food and no entertainment, so I'm not sure why these are even in the survey, as my understanding is frontier does not ever offer food without a few, not even a snack, and there are no screens so unless the flight safety talk is our entertainment why ask how we liked it?. One of the flight attendants say in the back of the plane as people filed in to their seats, yelling orders about where to put baggage and telling people to hurry up. It was the least professional experience I've ever had on a flight.

Very well recently! Frontier is improving and less harrassing customer on luggages! Positive!

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

It was costly and difficult to check in. $85 to take a small suitcase with me, carry on or checked and $75 on the return trip, Plus $25 if I didn't check my self in check in $25, because I couldn't do it on the kiosk. Small very uncomfortable seats, waited on the runway for near an hour each way. It was my worst flight to date.

It was ok. It was expensive to check 2 bags ($75.00 per bag), and then it took a long time to wait for shuttle to take us from one terminal to the terminal where the plane was taking off at LAX. And all of this for a flight where we had to pay for any food or drink that was not water.

It didn’t happen. I booked it and then was told it wasn’t available and then forced to pay far higher prices for a worse option

A 630departure flight Delayed 6hours! They changed my gate, I moved to the new gate. Had our flight on the screen for 12noon departure. I go get above to eat, check screen again and the flight was gone, no notice no announcement, nothing!! They sent my bag on the flight I wasn’t on, got it back to me 3days later. Thank goodness they did refund my money but I will NEVER fly them again.

Due to weather, my flight was delayed, further delayed, then canceled. I eventually got through to a support person who helped me find a different route out of MSP, but to get to DIA, they didn't want to, but eventually did help with the connection ticket purchase. But even this replacement flight was delayed time and time again, and I would have missed my connecting flights and I didn't want to get stuck in a layover city, so after 12 hours at the airport with two young boys who were very tired, we just cancelled our plans and spent the week at home, instead of Nana's.

Plane and crew on board were fine. Everything else was terrible.

Everything you need to know for your flight from Seattle to Knoxville

Information on your arrival and departure airports