TYS - IAD

$35 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 7/10. 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 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
$58
Typical prices: $308-$236
Allegiant Air
Mon 7/13Fri 7/31
TYS - IAD • Non-stop
Cheapest one-way
$35
Typical prices: $42-$283
Allegiant Air
Fri 7/10
TYS - IAD • Non-stop
Nonstop flights
You can fly direct with United Airlines and Allegiant Air. Average duration is 1h 37m
Direct flights
Direct flights
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+1
Direct flights
Direct flights
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When to travel
Cheapest • 48% price drop
Most popular
Good to know
Good to know
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Good to know
Good to know
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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

Mon, Jul 13 - Fri, Jul 31
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$58Allegiant Air
Mon, Jul 13 - Fri, Jul 17
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$60Allegiant Air
Mon, Jul 13 - Mon, Jul 27
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$61Allegiant Air
Mon, Jul 13 - Mon, Jul 27
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$62Allegiant Air
Fri, Jul 24 - Mon, Jul 27
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$64Allegiant Air
Fri, Jul 10 - Mon, Jul 13
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$65Allegiant Air
Fri, Jul 17 - Mon, Jul 20
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$66Allegiant Air
Fri, Jul 17 - Mon, Jul 20
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$70Allegiant Air
Fri, Jul 17 - Mon, Jul 20
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$71Allegiant Air
Mon, Jul 27 - Fri, Jul 31
Allegiant Air Logo
12:53 pm - 2:26 pm
TYS
-
IAD
1h 33mnonstop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$75Allegiant 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.

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

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

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 Thursday, 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 March, where tickets cost $130 (return) on average. On the other hand, the most expensive months are May and September, where the average cost of round-trip tickets is $424 and $359 respectively.

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$35
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly with an average 5% 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 5 days, the lowest price for a flight from Knoxville to Washington, D.C. Dulles Intl Airport was $35 for a one-way ticket and $58 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, KLM, Hawaiian Airlines, and Alaska 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 $328 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 $89 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 $177 or less one-way and $656 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

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Tuesday

United Airlines

United Airlines

Wednesday

United Airlines

United Airlines

Thursday

United Airlines

United Airlines

Friday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

United Airlines

See more direct flights

Direct returns

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

United Airlines

United Airlines

Friday

Allegiant Air,United Airlines

Allegiant Air,United Airlines

Saturday

United Airlines

United Airlines

Sunday

United Airlines

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 9828 reviews
7.3Comfort
7.1Entertainment
6.6Food
8.1Crew
7.7Boarding
Airline reviews

Our flight was delayed 2.5 hours from Lisbon to DC so we missed our connection to Seattle that would have arrived at about 9 PM. The agent initially said we had to stay overnight in DC and there were no other options to put us on to get us to Seattle. While on board I discovered a flight via American he could have put us in but by the time we arrived in DC that was sold out. We were then put on a flight to San Francisco that was also delayed then arrived in San Francisco and our flight to Seattle was also delayed so we ended up not arriving until 2:15 am. Our son could not pick us up so we ended up having to pay over $100 to Uber home. This is the second trip with United that the flight has been delayed causing us to miss an evening in Las Vegas and we were given nothing.

2.0 MediocreLinda, Jun 2026
LIS - IAD
Read more United Airlines reviews

Our flight was delayed 2.5 hours from Lisbon to DC so we missed our connection to Seattle that would have arrived at about 9 PM. The agent initially said we had to stay overnight in DC and there were no other options to put us on to get us to Seattle. While on board I discovered a flight via American he could have put us in but by the time we arrived in DC that was sold out. We were then put on a flight to San Francisco that was also delayed then arrived in San Francisco and our flight to Seattle was also delayed so we ended up not arriving until 2:15 am. Our son could not pick us up so we ended up having to pay over $100 to Uber home. This is the second trip with United that the flight has been delayed causing us to miss an evening in Las Vegas and we were given nothing.

MY FAMILY'S LUGGAGE WAS LOST FROM ROME TO BARI. I WAS THE ONLY ONE THAT RECEIVED MY LUGGAGE FROM ROME TO BARI. AFTER DEPLANING IN BARI, WE WASTED A LOT OF TIME AT BAG CLAIMS LOST AND FOUND REPORTING THE CLAIM AND PLEADING FOR THE BAGS TO BE DELIVERED THE NEXT DAY. WE WERE TOLD THAT IT TAKES 3 DAYS MINIMUM TO DELIVER. MY DAUGHTER AND MY GIRLFRIEND NEEDED THEIR PERSONAL THINGS AND WE WERE STAYING 3 HOURS AWAY FROM THE BARI AIRPORT. WE HAD TO DRIVE 3 HOURS TO THE AIRPORT TO COLLECT OUR LOST LUGGAGE THE NEXT DAY. WE ARE NOT HAPPY WITH THE EXPERIENCE

There were no facilities in the middle of the aircraft and premium economy was not allowed to use the business class facilities, and had to share the only two toilets at the back with economy. The upgrade to Premium was definitely not worth it

Our flight to Rome, Italy was cancelled the day of and we were never informed. We only found out because I was trying to get into my husbands account and called to get his account number. Had to pay more for worse seating on another airline.

The economy seat was much less comfortable for an international flight in terms of recline and moving space when food tray is expanded. Per entertainment, it would be amazing if I could connect my Bluetooth headset or ear phones to the entertainment screen. Or provide in-flight wifi to connect directly from my own device.

We were a little disappointed to not be able to complete check in online without uploading pics of passports. Also we have KTN's and they weren't on our boarding passes when we got to security. Had to trek back to counter to have them fix.

Excellent service in Polaris class IAD to ZRH. Arrived rested and well fed after the overnight flight.

It's a short hop. My carryon was checked at the gate, I didn't have to drag it all over the airport. Excellent wheelchair assist.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

Terrific in every way. On time, professional staff, multiple movie options to select, great food and drink.

Seats were very uncomfortable and being charged for snacks and water.........

Allegiant actually impressed me, original inbound flight from PBG was so late they gave us a bird inbound from Des Moines and only left 1h late and gained 40 minutes back in the air. Comfortable flight with no frills but no complaints.

Flight was delayed. Crew was good but hot coffee was not available.

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.

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

Information on your arrival and departure airports