TYS - IAD

$38 Find Cheap Flights from Knoxville to Washington Dulles Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Knoxville to Dulles Intl departing on 3/26. 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 Washington, D.C. Dulles Intl Airport

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

Cheapest round-trip
$86
Overall average: $365
Allegiant Air
Fri 5/22Mon 5/25
TYS - IAD • Non-stop
Cheapest one-way
$38
Typical prices: $60-$225
Allegiant Air
Thu 3/26
TYS - IAD • Non-stop
Advice from real travelers
AI-powered summary based on content written by travel experts. AI can make mistakes.
United's Priority Boarding ensures overhead bin space.
Lufthansa's Economy Light saves money without checked bags.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
Cheapest • from $86 (round-trip)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Every day
You can fly direct with United Airlines and Allegiant Air. Average duration is 1h 44m
Direct flights
Direct flights
+1
+1
Direct flights
Direct flights
+1
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 38% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 48% price drop
Most popular
Good to know
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+1
+1
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+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Dulles Intl!
Flight Deals
Booking Insights
Expert advice
Flight Deals

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

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

Fri, May 22 - Mon, May 25
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
Allegiant Air Logo
3:08 pm - 4:40 pm
IAD
-
TYS
1h 32mnonstop
$86Allegiant Air
Sun, Apr 12 - Sun, Apr 19
Allegiant Air Logo
11:27 am - 1:11 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
2:01 pm - 3:41 pm
IAD
-
TYS
1h 40mnonstop
$90Allegiant Air
Sun, Mar 29 - Thu, Apr 16
Allegiant Air Logo
6:39 pm - 8:23 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
2:01 pm - 3:41 pm
IAD
-
TYS
1h 40mnonstop
$94Allegiant Air
Sun, Mar 29 - Sun, Apr 5
Allegiant Air Logo
6:39 pm - 8:23 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
12:56 pm - 2:36 pm
IAD
-
TYS
1h 40mnonstop
$97Allegiant Air
Thu, Apr 2 - Sun, Apr 5
Allegiant Air Logo
8:20 am - 10:04 am
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
12:56 pm - 2:36 pm
IAD
-
TYS
1h 40mnonstop
$98Allegiant Air
Thu, Apr 2 - Sun, Apr 5
Allegiant Air Logo
8:20 am - 10:04 am
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
12:56 pm - 2:36 pm
IAD
-
TYS
1h 40mnonstop
$102Allegiant Air
Thu, Apr 2 - Sun, Apr 5
Allegiant Air Logo
8:20 am - 10:04 am
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
12:56 pm - 2:36 pm
IAD
-
TYS
1h 40mnonstop
$111Allegiant Air
Thu, Mar 26 - Sun, Mar 29
Allegiant Air Logo
1:21 pm - 3:05 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
4:09 pm - 5:49 pm
IAD
-
TYS
1h 40mnonstop
$119Allegiant Air
Thu, Mar 26 - Sun, Mar 29
Allegiant Air Logo
1:21 pm - 3:05 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
4:09 pm - 5:49 pm
IAD
-
TYS
1h 40mnonstop
$120Allegiant Air
Thu, Mar 26 - Sun, Mar 29
Allegiant Air Logo
1:21 pm - 3:05 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
4:09 pm - 5:49 pm
IAD
-
TYS
1h 40mnonstop
$121Allegiant Air
Booking Insights

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

Get data-powered insights and trends into flights from Knoxville to Dulles Intl 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 Knoxville to Washington Dulles Airport?

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Knoxville to Washington, D.C. Dulles Intl Airport, 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 Knoxville to Washington, D.C. Dulles Intl Airport is February, where tickets cost $143 (return) on average. On the other hand, the most expensive months are March and May, where the average cost of round-trip tickets is $372 and $365 respectively.

How far in advance should I book a flight from Knoxville to Washington, D.C. Dulles Intl Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Knoxville to Washington, D.C. Dulles Intl Airport, 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 Knoxville to Washington, D.C. Dulles Intl Airport, you should book around 3 weeks before departure, which saves you about 38% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Expert advice

Expert advice for your flight from Knoxville to Dulles Intl

 
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.
Our travel experts
Jessica Macdonald

Jessica Macdonald

Expert on Lufthansa

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has traveled to more than 50 countries across six continents.

Stefanie Waldek

Stefanie Waldek

Expert on United Airlines

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.

Good to know

Low seasonJanuary
Cheapest flight$38
Best time to beat the crowds with an average 11% drop in price.
Flight from Knoxville to Washington Dulles Airport

When to book flights from Knoxville to Dulles Intl

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

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

    In the last 3 days, the lowest price for a flight from Knoxville to Washington, D.C. Dulles Intl Airport was $38 for a one-way ticket and $86 for a round-trip.

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

    A passport is not required to fly from Knoxville to Washington Dulles Airport.

  • Which airports will I be using when flying from Knoxville to Washington Dulles Airport?

    Knoxville airport is called Knoxville McGhee Tyson and the only airport in Washington Dulles Airport is Washington, D.C. Dulles Intl.

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

    All the following airlines offer inflight Wi-Fi service on the Knoxville to Washington Dulles Airport flight route: American Airlines, Delta, Virgin Atlantic, Air France, Alaska Airlines, and Hawaiian Airlines.

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

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

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

    Star Alliance is the only airline alliance operating flights between Knoxville and Washington Dulles Airport.

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

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

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

    The two airlines most popular with KAYAK users for flights from Knoxville to Washington, D.C. are United Airlines and Allegiant Air. With an average price for the route of $320 and an overall rating of 7.4, United Airlines is the most popular choice. Allegiant Air is also a great choice for the route, with an average price of $90 and an overall rating of 7.3.

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

    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 Knoxville to Washington Dulles Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Knoxville 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 Knoxville to Washington Dulles Airport?

    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 Washington Dulles Airport with an airline and back to Knoxville with another airline. Booking your flights between Knoxville and IAD 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 Knoxville to Washington Dulles Airport?

    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 Washington Dulles Airport from Knoxville 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 Knoxville to Washington, D.C. Dulles Intl Airport

  • Looking for a cheap flight? 25% of our users found flights on this route for $223 or less one-way and $286 or less round-trip.

Prefer to fly direct from Knoxville to Washington Dulles Airport?

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

Direct departures

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

Monday

United Airlines,Allegiant Air

United Airlines,Allegiant Air

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Friday

United Airlines,Allegiant Air

United Airlines,Allegiant Air

Saturday

United Airlines

United Airlines

Sunday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

See more direct flights

Direct returns

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

Monday

United Airlines,Allegiant Air

United Airlines,Allegiant Air

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Friday

United Airlines,Allegiant Air

United Airlines,Allegiant Air

Saturday

United Airlines

United Airlines

Sunday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

See more direct flights

Reviews of the top airlines flying from Knoxville to Dulles Intl

 
See real verified KAYAK customer reviews for airlines flying from Knoxville to Washington, D.C.. 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 Knoxville to Dulles Intl? 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.
7.4
United AirlinesOverall score based on 9427 reviews
7.7Boarding
7.3Comfort
7.1Entertainment
6.6Food
8.1Crew
Airline reviews

It was okay, the food was good, but after the landing there was not enough time for luggage and security to catch a connection. It was crowded on board.

6.0 GoodOlga, Mar 2026
FRA - IAD
Read more United Airlines reviews

It was okay, the food was good, but after the landing there was not enough time for luggage and security to catch a connection. It was crowded on board.

When I went to check in at the United counter in Barcelona, Spain I had 2 different menat 2 different times in United uniforms (standing around with a couple other employees) ask me if I was traveling alone. The one man asked me 3 different ways if I was traveling alone. I am, 68 yeaers old and have all my faculties. I thought it was weird and it made me feel very uncomfortable. What difference does it make if I was traveling alone or with someone? What if I was a recent widow? That would have been horrible. They never gave me a reason why they needed to know who I was traveling with. I was hesitant to question them because I needed to be on that flight.

Crew was great. 2 1/2 hour delay was due to staff needing "rest" was avoidable and self inflicted as United not willing to hire enough crew to keep flight on time.. Ridiculous. The crew and the passengers both suffered due to this.

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

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).

Great other than a couple very drunk guys that for a while kept bumping my seat from behind. The staff did their best to control them. Even refused serving them alcohol and allowed the gal sitting next to them to move.

Good crew. Boarding delays. Almost two hours wait for the bags in DC.

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

It was great. There were some issues prior to takeoff. The weather was poor so we had to go through deicing, and we were delayed a bit by the pilots' concern about one of the engines, but that's aviation. The pilots handled everything with aplomb, and kept us apprised

The seats were comfortable and we had leg room. Great entertainment.

Superb. Staff great. Great flight. As with other airlines, seating too tight and restrictive.

There is not one likable thing about this airline. It’s starts with the deceptive pricing and continues through the whole flight. The worst staff I’ve ever experienced way over priced bags absolutely no food or drink (unacceptable and you should be embarrassed) the seats are cramped and uncomfortable there is no entertainment there is nothing about this trash airline that constitutes any amount of money. It’s worse than spirit and way more expensive it is disgraceful. Do not travel with Allegiant I repeat do not bother no matter what they say the price is it is never ever going to be the right choice I’m mind blown at how awful the entire experience was I’m embarrassed that I chose so poorly I cannot reiterate enough how beyond horrible this company and its staff are, not one person on this flight or at the airport is qualified to sweep up trash on a city sidewalk they should certainly never be given any job that requires a brain or manners or communication with human beings, what a disgrace to the human race. Your criminal chiselers and should be put out to pasture

Great flight. Friendly staff. Free snacks and drinks would be nice. I would love fewer taxes and fees added on.

My 90 year old father flew with me. He needed wheel chair assistance and is nearly deaf. The staff was amazing with him.

It was fine. Nobody was outstandingly friendly but no one was rude and everything was smooth . The captain thanked us for flying but no one greeted me as I walked on the plane or as I exited which is the least they could do lol

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.

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

Information on your arrival and departure airports