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Dulles Intl

$48+ Cheap flights from Knoxville (TYS) to Dulles Intl (IAD)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — IAD
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
1 adult, Economy
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Find cheap flights from Knoxville to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

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3. Compare prices and book

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Cheapflights Tip: The best prices from Knoxville McGhee Tyson to Washington, D.C. Dulles Intl are usually found in December or June, booked 23 days in advance, depart on a Friday or Wednesday and return on a Friday

Cheap flight deals from Knoxville to Dulles Intl

Cheapest flights from Knoxville to Dulles Intl
Explore the most affordable flight options available from Knoxville to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 3, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/195:56 pm
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Sun 2/228:30 pm
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/2$73
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/225:56 pm
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Sun 3/89:54 am
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/1$74
This Kiwi.com deal was found by Cheapflights users on 2/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/265:53 pm
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Sun 3/18:27 pm
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/3$75
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:20 am
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Sun 3/89:54 am
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/2$78
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/156:30 am
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Thu 3/193:42 pm
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/1$98
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:20 am
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Thu 3/129:04 am
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/2$105
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/3112:53 pm
TYS
-
IAD
Nonstop1h 33m
Allegiant Air
Mon 8/103:30 pm
IAD
-
TYS
Nonstop1h 34m
Allegiant Air
Deal found 2/2$113
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/225:56 pm
TYS
-
IAD
Nonstop1h 44m
Multiple Airlines
Sun 3/88:09 am
IAD
-
TYS
1 stop13h 41m
Multiple Airlines
Deal found 2/1$134
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/51:39 pm
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Sun 2/84:13 pm
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/1$137
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:20 am
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Sun 3/159:04 am
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/2$141
This Kiwi.com deal was found by Cheapflights users on 2/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:30 am
TYS
-
IAD
Nonstop1h 44m
Allegiant Air
Sun 3/159:04 am
IAD
-
TYS
Nonstop1h 40m
Allegiant Air
Deal found 2/2$144
This Kiwi.com deal was found by Cheapflights users on 2/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/267:00 am
TYS
-
IAD
1 stop12h 12m
Multiple Airlines
Sun 3/18:27 pm
IAD
-
TYS
Nonstop1h 40m
Multiple Airlines
Deal found 2/1$152

Find flight deals from Knoxville to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Knoxville (TYS) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$73
(Kiwi.com)

One-way from

$48
(Kiwi.com)

Popular in

January

Cheapest in

December

Average price

$261

Good round-trip deal

$456 or less

Good one-way deal

$133 or less
Provider with most accurate pricing for Knoxville McGhee Tyson-Washington, D.C. Dulles Intl flight deals.
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Provider most trusted by Cheapflights users for Knoxville McGhee Tyson-Washington, D.C. Dulles Intl flights.
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From Knoxville McGhee Tyson to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Knoxville McGhee Tyson to Washington, D.C. Dulles Intl
Search Deals
High demand for flights, 3% potential price rise
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Knoxville McGhee Tyson to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Knoxville McGhee Tyson to Washington, D.C. Dulles Intl.
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Cheapflights Fare Finder

 
Customize your flight search to find flights from Knoxville to Dulles Intl that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 3, 2026.
Use the filters below to find and compare flights from Knoxville to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Knoxville

Fly to

Dulles Intl

Route

Depart

Return

Price

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 3/5

7:20 am-9:04 am

Nonstop1h 44m

Washington, D.C. Dulles Intl

Thu 3/12

9:04 am-10:44 am

Nonstop1h 40m

$105

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 3/5

7:20 am-9:04 am

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 3/8

8:09 am-9:50 pm

1 stop13h 41m

$134

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 4/16

9:40 am-11:25 am

Nonstop1h 45m

Washington, D.C. Dulles Intl

Sat 4/18

9:00 am-10:50 am

Nonstop1h 50m

$183

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sat 5/2

7:18 pm-9:03 pm

Nonstop1h 45m

Washington, D.C. Dulles Intl

Tue 5/5

9:00 am-10:49 am

Nonstop1h 49m

$183

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Wed 4/22

7:20 pm-9:05 pm

Nonstop1h 45m

Washington, D.C. Dulles Intl

Sun 4/26

9:00 am-10:50 am

Nonstop1h 50m

$186

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sat 2/28

7:25 pm-9:11 pm

Nonstop1h 46m

Washington, D.C. Dulles Intl

Sun 3/1

9:00 am-10:49 am

Nonstop1h 49m

$189

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Tue 3/10

2:21 pm-4:07 pm

Nonstop1h 46m

Washington, D.C. Dulles Intl

Tue 3/17

12:55 pm-2:50 pm

Nonstop1h 55m

$189

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 2/20

7:25 pm-9:11 pm

Nonstop1h 46m

Washington, D.C. Dulles Intl

Sun 2/22

9:00 am-10:49 am

Nonstop1h 49m

$204

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sat 2/21

7:25 pm-9:11 pm

Nonstop1h 46m

Washington, D.C. Dulles Intl

Tue 2/24

9:00 am-10:49 am

Nonstop1h 49m

$204

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Wed 2/18

7:25 pm-9:11 pm

Nonstop1h 46m

Washington, D.C. Dulles Intl

Sun 2/22

9:00 am-10:49 am

Nonstop1h 49m

$219

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/2

Showing 1-10 of 19 results
1
2

Compare providers for flights from Knoxville to Dulles Intl

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Knoxville to Dulles Intl in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Knoxville-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Knoxville-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Knoxville-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Knoxville-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Knoxville-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Knoxville to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Knoxville with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Knoxville to Washington, D.C. Dulles Intl Airport

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

Use this chart to determine the optimal time to book a round-trip flight from Knoxville to Dulles Intl. Price data was last updated on January 30, 2026.

To ensure you get the cheapest price possible for a flight from Knoxville to Washington, D.C. Dulles Intl Airport, you should look to book at least 23 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, October is the cheapest month in which you can book a flight from Knoxville to Washington, D.C. Dulles Intl Airport (average of $44). Flying from Knoxville to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $182). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from TYS to IAD?

Find hourly flight availability from Knoxville to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 3, 2026.

A simple way to save on the total cost of your ticket is to fly from Knoxville to Washington, D.C. Dulles Intl Airport in the afternoon. If you’re flexible enough to do this you can expect to save up to 87% on your trip compared to booking a flight at noon.

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Dulles Intl. Reviews last updated February 3, 2026.
Get a feel of what it's like to fly with United Airlines and Allegiant Air from Knoxville to Washington, D.C. Dulles Intl Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,232 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,232 reviews
United Airlines
7.4
Good
9,232 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Allegiant Air
7.2
Good
709 reviews
United Airlines
7.4
Good
9,232 reviews

Boarding

7.7

Crew

8.1

Food

6.6

Comfort

7.3

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Knoxville to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Knoxville to Washington, D.C. Dulles Intl?

    If you book a flight to Washington, D.C. Dulles Intl from Knoxville, you will be flying from McGhee Tyson, which is the city’s only airport. Knoxville McGhee Tyson (TYS) is located 11.3 mi from the center of Knoxville. There are 12 flights from McGhee Tyson to Washington, D.C. Dulles Intl per day from 2 different airlines.

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

    Allegiant Air and United Airlines can get you from Knoxville to Washington, D.C. Dulles Intl Airport in just under 1h 44m. Your travel time will be generally consistent. Airlines will cover a distance of 419 mi. All flights are typically nonstop.

  • What are the cheapest airlines flying from Knoxville to Washington, D.C. Dulles Intl Airport round-trip?

    Cheapflights users have booked flights from Knoxville to Washington, D.C. Dulles Intl Airport round-trip from $43. Another airline that can offer you cheap pricing is United Airlines. These flights start at 85% lower than the current average price 3 months from now.

  • What are the most reliable airlines from Knoxville to Washington, D.C. Dulles Intl Airport?

    The top 3 most reliable airlines when flying from Knoxville to Washington, D.C. Dulles Intl Airport are Lufthansa (86%), Copa Airlines (80%) and Allegiant Air (80%).

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

    Looking at all options, your cheapest flight can be booked for $42. While the most popular route (Knoxville McGhee Tyson - Washington, D.C. Dulles Intl) can be booked for $74 on average, our data indicates $789 when flying from Knoxville to Washington, D.C. Dulles Intl Airport.

  • Can I find deals for flights from Knoxville to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Knoxville to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Knoxville to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Knoxville to Dulles Intl.

  • Can I find deals for business class flights from Knoxville to Dulles Intl?

    Yes. Cheapflights offers flight deals from Knoxville to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, October is the cheapest month in which you can book a flight from Knoxville to Washington, D.C. Dulles Intl Airport (average of $44). Flying from Knoxville to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $182). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Herndon
Fredericksburg
Hanover
Linthicum Heights
Rockville
Laurel
Towson
Upper Marlboro
Manassas
Largo
Bowie
McLean
Clinton

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Knoxville to Dulles Intl

Discover the top 2 airlines that operate flights from Knoxville to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$43Average$90FlexibilityNo cancel feeOn-time88%
United AirlinesCheapest$194Average$330FlexibilityNo cancel feeOn-time69%

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