TYS - IAD

$40 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 2/26. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$81
Overall average: $261
Allegiant Air
Thu 2/12Sun 2/15
TYS - IAD • Non-stop
Cheapest non-stop
$98
Typical prices: $189-$559
Allegiant Air
Thu 2/19Sun 2/22
TYS - IAD • Non-stop
Our travelers' advice
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
Allegiant Air
Cheapest • from $81 (round-trip)
United Airlines
Best reviews • 7.4 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 34% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
December
Cheapest • 20% price drop
April
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+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

Thu, Feb 12 - Sun, Feb 15
Allegiant Air Logo
6:11 pm - 7:55 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
8:45 pm - 10:25 pm
IAD
-
TYS
1h 40mnonstop
$81Allegiant Air
Sun, Mar 1 - Thu, Mar 5
Allegiant Air Logo
5:53 pm - 7:37 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
9:54 am - 11:34 am
IAD
-
TYS
1h 40mnonstop
$85Allegiant Air
Thu, Feb 19 - Sun, Feb 22
Allegiant Air Logo
5:56 pm - 7:40 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
8:30 pm - 10:10 pm
IAD
-
TYS
1h 40mnonstop
$98Allegiant Air
Thu, Apr 9 - Sun, Apr 12
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
$99Allegiant Air
Thu, Apr 9 - Sun, Apr 12
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
$100Allegiant Air
Thu, Apr 9 - Thu, Apr 16
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
$103Allegiant Air
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
$110Allegiant Air
Sun, Apr 12 - Thu, Apr 16
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
$113Allegiant Air
Mon, May 25 - Fri, Jun 5
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
Allegiant Air Logo
3:06 pm - 4:40 pm
IAD
-
TYS
1h 34mnonstop
$116Allegiant Air
Sun, Mar 8 - Thu, Mar 12
Allegiant Air Logo
7:20 am - 9:04 am
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
9:04 am - 10:44 am
IAD
-
TYS
1h 40mnonstop
$144Allegiant 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 December, where tickets cost $239 (return) on average. On the other hand, the most expensive months are January and March, where the average cost of round-trip tickets is $371 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 34% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 22 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$40
Best time to beat the crowds but there is an average 23% increase in price.
Most popular time to fly with an average 7% increase 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 $40 for a one-way ticket and $81 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 $332 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 7.2.

  • 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 $87 or less one-way and $373 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

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

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

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

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 9215 reviews
7.7Boarding
7.3Comfort
6.6Food
7.1Entertainment
8.1Crew
Airline reviews

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

6.0 GoodMichael, Jan 2026
GVA - IAD
Read more United Airlines reviews

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.

The flight crew where really good. Better then the crew from BNE to SFO

Safe made to destination. Late to start at GVA for icy reasons but we fought our next fly.

Miserable. They moved my seat, but canceled the next leg of my flight. I resolved the issue at my transfer, but that resulted in lost luggage that has taken days off my schedule with no resolution. Worse, they fail to interface effectively with Lufthansa, forcing me to bounce between two equally useless help desks. The apps are unable to handle the situation, the bag dropped off the tracker, and while the call centers are polite, they do not provide written information to assist with cross-airline communication.

l really enjoy very much the flight was very pleasant

The flight was delayed for 1:30 hours for maintenance issues. They should give more information about connecting flights. For a Business Cabin the Crew was mediocre.

The food is terrible. The same pasta or chicken with bad taste and presentation

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.

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.

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

Information on your arrival and departure airports