IAD - TYS

$36 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 5/10. 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
$86
Typical prices: $371-$252
Allegiant Air
Fri 6/19Mon 6/22
IAD - TYS • Non-stop
Cheapest non-stop
$82
Typical prices: $365-$87
Allegiant Air
Thu 5/7Sun 5/10
IAD - TYS • Non-stop
Advice from real travelers
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
Nonstop flights
You can fly direct with United Airlines and Allegiant Air. Average duration is 1h 41m
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 24% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 38% price drop
Most popular
Good to know
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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

Fri, Jun 19 - Mon, Jun 22
Allegiant Air Logo
3:19 pm - 4:53 pm
IAD
-
TYS
1h 34mnonstop
Allegiant Air Logo
1:02 pm - 2:29 pm
TYS
-
IAD
1h 27mnonstop
$86Allegiant Air
Fri, Jun 19 - Mon, Jun 22
Allegiant Air Logo
3:19 pm - 4:53 pm
IAD
-
TYS
1h 34mnonstop
Allegiant Air Logo
1:02 pm - 2:29 pm
TYS
-
IAD
1h 27mnonstop
$88Allegiant Air
Mon, Jun 15 - Fri, Jun 19
Allegiant Air Logo
3:06 pm - 4:40 pm
IAD
-
TYS
1h 34mnonstop
Allegiant Air Logo
1:02 pm - 2:29 pm
TYS
-
IAD
1h 27mnonstop
$92Allegiant Air
Fri, Jul 24 - Mon, Jul 27
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
$93Allegiant Air
Mon, Jul 27 - Fri, Jul 31
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
$96Allegiant Air
Fri, May 22 - Fri, May 29
Allegiant Air Logo
3:08 pm - 4:40 pm
IAD
-
TYS
1h 32mnonstop
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
$107Allegiant Air
Fri, May 22 - Fri, May 29
Allegiant Air Logo
3:08 pm - 4:40 pm
IAD
-
TYS
1h 32mnonstop
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
$112Allegiant Air
Fri, May 22 - Fri, May 29
Allegiant Air Logo
3:08 pm - 4:40 pm
IAD
-
TYS
1h 32mnonstop
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
$118Allegiant Air
Mon, Jun 1 - Fri, Jun 5
Multiple Airlines Logo
6:22 pm - 4:15 pm
IAD
-
TYS
21h 53m
1 stop
Multiple Airlines Logo
12:49 pm - 2:16 pm
TYS
-
IAD
1h 27mnonstop
$126Multiple Airlines
Mon, Jun 8 - Wed, Jun 10
Multiple Airlines Logo
3:06 pm - 4:40 pm
IAD
-
TYS
1h 34mnonstop
Multiple Airlines Logo
1:02 pm - 8:02 pm
TYS
-
IAD
7h 00m
1 stop
$127Multiple Airlines
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.

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Knoxville?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to Knoxville departing in June.

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 Thursday and more expensive on a Saturday. On your return trip to Washington Dulles Airport, you should consider flying back on a Friday, and avoid Saturdays 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 March, where tickets cost $171 (return) on average. On the other hand, the most expensive months are January and September, where the average cost of round-trip tickets is $438 and $414 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 24% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 20 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.
Our travel experts
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.

Daniel Scheffler

Daniel Scheffler

Expert on Allegiant Air

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.

Good to know

Low seasonSeptember
Cheapest flight$36
Best time to beat the crowds but there is an average 49% increase in price.
Most popular time to fly and prices are also 21% 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 $33 for a one-way ticket and $86 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 $249 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 $366 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 $87 or less one-way and $104 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

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Friday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Saturday

United Airlines

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

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Friday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Saturday

United Airlines

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 8467 reviews
7.8Entertainment
8.1Boarding
7.2Food
7.9Comfort
8.5Crew
Airline reviews

The agent at check in and at the gate were less than thrilled to be at work. I'm not a fan of Kayak's placement on the plane. I got put in the middle seat and none of my preferences were used.

4.0 OkayBradley, Apr 2026
RDU - ATL
Read more Delta reviews

The agent at check in and at the gate were less than thrilled to be at work. I'm not a fan of Kayak's placement on the plane. I got put in the middle seat and none of my preferences were used.

In ATL they have two sets of departure screens. Follow what is on your airline's departure board - the ATL Airport Authority departure board had completely incorrect details about the gate assignment for my flight, which would have made me miss boarding.

Flight was delayed it was hot while sitting on the plane, one engine was working on the plane until they had to do some jimmy rigging down the runway in order for the other engine to charge up. It was ridiculous

The flight was very good and the staff was very friendly and helpful!

The only thing I would say is we tried to get on a standby earlier flight, but with our fair we couldn’t. That seems senseless to leave with open seats..

Very easy to use and convenient, you can perform any action within the same portal

In a world of delays, Delta was on time both ways! Boarding was fast and efficient. Staff was friendly. AND wifi worked.

WiFi didn’t work. Flight delayed 3 hours Crew members were illiterate Seat lean back did not work.

Flight was delayed, we could have been notified earlier and in a consistent manner. App was not refreshing for another passenger to get the latest flight status. We could have stayed and waited at the hotel instead of waiting at the airport had we known the flight was going to delayed for more than 5 hours. The toilet is too tight, and needs to be cleaned more frequently (every hour). The entertainment screen froze, the touch screen not responding to touch. We were upgraded to comfort, it is more comfortable than regular economy seats.

This wasn't my experience with Delta. It was just the Pegasus flight. Seats were very hard. Staff was kinda rough. Not very nice. Charged me for snacks. For a 4 hour flight I would've expected more.

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Ineffective communication with United resulted in lost baggage. Their Baggage Tracing counter at MUC was shut down from 11:00-14:15 on my arrival. Undertrained, underinformed staff had me Running all over MUC to find someone to help me to no avail. Staff was rude, unhelpful, and unable to effectively use the systems they did have operational. They refused to contact United in any way or provide any accommodation or other resources while I waited for my luggage. This has destroyed my downstream itinerary. If they had even the slightest visibility I may have been able to reschedule/plan, but again, their staff provided nothing, and did nothing more than their website, which doesn’t even work on a standard phone browser. Miserable failure at all levels that weren’t associated with the operation of the aircraft.

Sat next to a one year old. She crawled all over the place and made me laugh.

Great. No choice for n/a. No food or entertainment options

No food is available without purchasing it and there is no in-flight entertainment. Both of these are OK because we got an inexpensive flight from Allegiant and, otherwise, our experience was excellent.

just had water and there was plenty of leg & seat room. But then i don't weight 220#s!!

Not totally their fault- screaming kids that had zero parent intervention.

It was cold on the flight. The crew was very pleasant. I didn't order any food. We were delayed due to Captain waiting on maintenance log. He kept us informed though. The flight itself was smooth. I would definitely fly with Allegiant again!

I had a fantastic experience with Allegiant. I had wheelchair assistance and they helped me find my luggage and brought me to my car. Even loaded my luggage. Wonderful service!! Thank you Allegiant!

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.

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

Information on your arrival and departure airports