IAD - TYS

$43 Find Cheap Flights from Washington Dulles Airport 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 Dulles Intl to Knoxville departing on 12/18. 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 Washington, D.C. 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 Washington, D.C. to Knoxville, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$113
Overall average: $396
Allegiant Air
Wed 12/24Wed 12/31
IAD - TYS • Non-stop
Cheapest one-way
$43
Typical prices: $83-$299
Allegiant Air
Thu 12/18
IAD - TYS • Non-stop
Our travelers' advice
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Economy Plus offers more legroom than standard.
Allegiant's Bonus bundle includes carry-on and seat selection.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
United Airlines
Cheapest • from $189 (round-trip)
Delta
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 25% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
July
Cheapest • 58% 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
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Expert advice
Flight Deals

Cheap Flights from Dulles Intl to Knoxville (IAD-TYS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl 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 Dulles Intl to Knoxville

Wed, Dec 24 - Wed, Dec 31
Allegiant Air Logo
2:35 pm - 4:15 pm
IAD
-
TYS
1h 40mnonstop
Allegiant Air Logo
12:01 pm - 1:45 pm
TYS
-
IAD
1h 44mnonstop
$113Allegiant Air
Sun, Dec 21 - Wed, Dec 31
Allegiant Air Logo
8:16 pm - 9:56 pm
IAD
-
TYS
1h 40mnonstop
Allegiant Air Logo
12:01 pm - 1:45 pm
TYS
-
IAD
1h 44mnonstop
$119Allegiant Air
Thu, Jan 8 - Mon, Jan 12
Multiple Airlines Logo
4:13 pm - 5:53 pm
IAD
-
TYS
1h 40mnonstop
Multiple Airlines Logo
6:18 pm - 11:43 am
TYS
-
IAD
17h 25m2 stops
$146Multiple Airlines
Sat, Jan 3 - Sat, Jan 10
Multiple Airlines Logo
4:57 pm - 6:37 pm
IAD
-
TYS
1h 40mnonstop
Multiple Airlines Logo
5:30 pm - 7:40 am
TYS
-
IAD
14h 10m1 stop
$147Multiple Airlines
Thu, Jan 8 - Sun, Jan 11
Allegiant Air Logo
6:37 pm - 8:36 pm
IAD
-
TYS
25h 59m1 stop
Allegiant Air Logo
1:39 pm - 3:23 pm
TYS
-
IAD
1h 44mnonstop
$154Allegiant Air
Thu, Jan 8 - Sun, Jan 11
Allegiant Air Logo
6:37 pm - 8:36 pm
IAD
-
TYS
25h 59m1 stop
Allegiant Air Logo
1:39 pm - 3:23 pm
TYS
-
IAD
1h 44mnonstop
$155Allegiant Air
Thu, Jan 8 - Sun, Jan 11
Multiple Airlines Logo
4:13 pm - 5:53 pm
IAD
-
TYS
1h 40mnonstop
Multiple Airlines Logo
9:00 am - 7:40 am
TYS
-
IAD
22h 40m1 stop
$156Multiple Airlines
Thu, Jan 8 - Sun, Jan 11
Multiple Airlines Logo
4:13 pm - 5:53 pm
IAD
-
TYS
1h 40mnonstop
Multiple Airlines Logo
9:29 am - 3:27 pm
TYS
-
IAD
29h 58m2 stops
$157Multiple Airlines
Fri, Jan 9 - Sun, Jan 11
Multiple Airlines Logo
8:40 am - 5:28 pm
IAD
-
TYS
8h 48m1 stop
Multiple Airlines Logo
1:39 pm - 3:23 pm
TYS
-
IAD
1h 44mnonstop
$160Multiple Airlines
Wed, Dec 24 - Sat, Dec 27
Allegiant Air Logo
2:35 pm - 4:15 pm
IAD
-
TYS
1h 40mnonstop
Allegiant Air Logo
2:23 pm - 4:07 pm
TYS
-
IAD
1h 44mnonstop
$162Allegiant Air
Booking Insights

KAYAK's insights & trends for Dulles Intl to Knoxville flights

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

What’s the cheapest day of the week to fly from Washington Dulles Airport to Knoxville?

The average price of all round-trip flights from Washington, D.C. Dulles Intl Airport to Knoxville clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Knoxville on a Friday and more expensive on a Sunday. On your return trip to Washington Dulles Airport, you should consider flying back on a Friday, and avoid Mondays for better deals.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Knoxville?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport to Knoxville is July, where tickets cost $126 (return) on average. On the other hand, the most expensive months are September and December, where the average cost of round-trip tickets is $406 and $396 respectively.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport to Knoxville, you should book around 3 weeks before departure, which saves you about 25% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

Expert advice

Expert advice for your flight from Dulles Intl to Knoxville

 
AI-powered summary based on content written by travel experts. AI can make mistakes.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
United Airlines

United's Economy Plus offers up to six inches more legroom than standard economy seats.


United's Priority Boarding places you in Zone 2, avoiding overhead bin space issues.

Allegiant Air

Allegiant's Bonus bundle includes a carry-on, seat selection, and ticket change flexibility.


Allegiant's Legroom+ seats offer extra space and faster deplaning on select routes.

Our travel experts
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or on the sea, likely en route to Antarctica or the Arctic.

Read more
Daniel Scheffler

Daniel Scheffler

Expert on Allegiant Air

Daniel Scheffler

Daniel Scheffler

Daniel Scheffler is a travel writer, podcaster, and producer. Born in Africa, bred in Europe and now living in America he has traveled to 140 countries (and all 50 U.S. states). Plus he has stayed at over 2500 hotels across the globe. His original shows Everywhere and Without Maps (available on Spotify) showcase his beliefs, travel is about humanity and sharing that beauty. And thus it reminds you that you shouldn’t believe everything you think.

Read more

Good to know

Low seasonFebruary
Cheapest flight$43
Best time to beat the crowds but there is an average 18% increase in price.
Most popular time to fly and prices are also 35% lower on average.
Flight from Washington Dulles Airport to Knoxville

When to book flights from Dulles Intl to Knoxville

Are your dates flexible? Find out the best times to travel from Dulles Intl 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 Washington Dulles Airport to Knoxville flights

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to Knoxville?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Knoxville was $43 for a one-way ticket and $113 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and Knoxville?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airlines offer Wi-Fi service onboard planes from Washington Dulles Airport to Knoxville?

    American Airlines, and JetBlue offer inflight Wi-Fi service on the Washington Dulles Airport to Knoxville flight route.

  • Which aircraft models fly most regularly from Washington Dulles Airport to Knoxville?

    The Embraer ERJ-135 / ERJ-140 / ERJ-145 is the aircraft model that flies most regularly on the Washington Dulles Airport to Knoxville flight route.

  • Which airline alliances offer flights from Washington Dulles Airport to Knoxville?

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

  • On which days can I fly direct from Washington Dulles Airport to Knoxville?

    There are nonstop flights from Washington Dulles Airport to Knoxville on a daily basis.

  • Which is the best airline for flights from Washington, D.C. to Knoxville, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Knoxville are Delta and United Airlines. With an average price for the route of $233 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $369 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport 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 Washington Dulles Airport to Knoxville.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Knoxville from Washington Dulles Airport 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 Washington Dulles Airport 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 Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport 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 Washington Dulles Airport 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 Washington Dulles Airport 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 Washington, D.C. Dulles Intl Airport to Knoxville

  • Looking for a cheap flight? 25% of our users found flights on this route for $46 or less one-way and $145 or less round-trip.

Prefer to fly direct from Washington Dulles Airport to Knoxville?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Washington, D.C. Dulles Intl to Knoxville McGhee Tyson.
Find which airlines fly direct from Washington, D.C. Dulles Intl Airport to Knoxville McGhee Tyson Airport, which days they fly and book direct flights.

Direct departures

Washington, D.C. Dulles Intl to Knoxville McGhee Tyson

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

Allegiant Air, United Airlines

Allegiant Air, United Airlines

Friday

United Airlines

United Airlines

Saturday

Allegiant Air, United Airlines

Allegiant Air, United Airlines

Sunday

Allegiant Air, United Airlines

Allegiant Air, United Airlines

See more direct flights

Direct returns

Knoxville McGhee Tyson to Washington, D.C. Dulles Intl

Monday

United Airlines

United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

Allegiant Air, United Airlines

Allegiant Air, United Airlines

Friday

United Airlines

United Airlines

Saturday

Allegiant Air, United Airlines

Allegiant Air, United Airlines

Sunday

Allegiant Air, United Airlines

Allegiant Air, United Airlines

See more direct flights

Reviews of the top 3 airlines serving from Dulles Intl to Knoxville

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. 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 Dulles Intl 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.
7.9
DeltaOverall score based on 8007 reviews
8.5Crew
7.9Comfort
7.9Entertainment
8.1Boarding
7.3Food
Airline reviews

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

10.0 ExcellentVenkata Krishna, Dec 2025
ATL - SDF
Read more Delta reviews

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

The food is terrible. The staff is wonderful. Comfort is good.

Left on time, a bit delayed due to headwinds most of the trip.

I fly Delta all the time, have Platinum Medallion status. But this route seems to have major problems with delays and seems to never leave on time! Have only taken it twice in the last two weeks, and each time it had delays of more than 1 hour... very disappointed!!!!

Good seats in Main cabin, excellent service and excellent landing

My flight was cancelled with no explanation after I had already cleared security. I was given 4 options to rebook, only one being non-stop like I had paid for. I grabbed it. It was 4 plus hours later and then took off even later. Biggest complaint is that I booked early and had an aisle seat. They gave me a "window" seat in front of the exit row, so the seat did not decline. I weigh all of 103 #s and it was tight for me! For what I paid, I feel I was kind of ripped off. I think they should have given me the empty comfort seat for the inconvenience. There was no apology nor any explanation as to why the flight was cancelled. My guess is it benefitted Delta in some way.

Very smooth, on-time, and pleasantly uneventful flight. The team at the gate and on board were professional and genuinely courteous. The pilot kept us well updated throughout, and both takeoff and landing were steady and enjoyable without any drama. Just a good, solid flight. Thank you! 💗

Staff was exceptional! Everyone was kind, professional and friendly making the trip very pleasant. Thank you!

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

We had a lot of really rough weather but that was not Delta's fault. Pilot was amazing.

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

During booking, I kept trying submitting my payment from the Mexican website and it didn't work. After I had the idea to change it to the Canadian website, it worked but I had to be charged the equivalent of 50 CAD more. I received the clear instruction that I would only be able to check-in at the airport and that it was impossible to select a seat 24 hours before departure, that I had to pay 144 CAD to do so, although not only was I able to check-in 24 hours before departure, but I could have selected my seats for free then. All in all, I almost threw $200 out the window due to misleading information. Besides, the app kept crashing, the information to get to the gate on the app was inaccurate, my gate was switched and I was only informed once in the air (luckily I had noticed the departure pannel), I was not addressed in my language beforehand and even if I tried I was immediately answered in English (which meant the crew understood but didn't want to answer accordingly), there was only one snack & beverage service on my medium haul flight and no beverage service on my short haul flight. To be fair, the planes were comfortable, the crew apart from the language issue was helpful, dynamic and engaging, the plane was clean and the directions were clear and direct. United has a lot of potential to be one of my favourite airlines, but the devil is in the details and a lot of them missed the target.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Very small cramped plane for an international flight. Everything else was good, but it was maybe the smallest comfort-wise I've ever been on for longer than 3-4 hours and the trip was 7.5

Flight was delayed 3 hours. No food and drink vouchers was provided. They offered a mini pretzel bag and water .

Staff was rude. Didn’t give water for 2 hours. Worst service

Clean, friendly, roomy. But check-in from the phone link was terrible. Repeated attempts wouldn’t save at the final step. Just kept spinning! It was very frustrating. Finally, I used the app (vs website link) to check-in which worked very smoothly on the first attempt.

Check in on the web portal was cumbersome! After several attempts I finally got the boarding pass.

Excellent flight and even arrived 23 min early. No entertainment , or wi fi on board, but I downloaded a couple of movies beforehand which kept me entertained. Really like flying Allegiant airlines.

WE were delayed about an hour and never any communications from the employees working the gate. We also were moved to a total of three gates.

I love how they show love to their customers and care about them too.

I liked how when I got on board how fast we ended up taking off but what I truly disliked was how uncomfortable the seats were. There was truly never a time that I could ever get comfortable during both of my flights. The seats could get away during shorter flights but flights 3 hour plus makes it hard to enjoy.

The crew was great and the flight was very smooth. Can’t really judge food since I did not get any because it costs money. The seat was comfortable for what we bought. Thanks!

Crew was great. No entertainment and food and beverage was for purchase only, even water

It was canceled. The flight wasn’t rescheduled, everyone had to figure out their own new arrangements. They said we would get refunded our original fare and receive an additional $150. We received links for $100 only and they expired before we could activate them.

The plane had originated in Las Vegas at 6:30 in the morning and flew to Moline where we boarded. The flight left around 12:30 PM and there were no boxed snacks available and many of the alcoholic beverages were unavailable. I would find it hard to believe that that many of the passengers coming from Las Vegas at 6:30 in the morning, drank and ate that much of the items. I can only come to the conclusion that someone failed to stock the plane for the round-trip. This is a huge revenue failure for the airline and disappointment for the passengers. The flight crew did not seem happy to be there and did not engage with passengers. Allegiant you can do better.

Everything you need to know for your flight from Dulles Intl to Knoxville

Information on your arrival and departure airports