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Dulles Intl

$43+ 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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — IAD
Oct 19 — Oct 261
Sun 10/19
Sun 10/26
1 adult, Economy
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Cheapflights Tip: The best prices from Knoxville McGhee Tyson to Washington, D.C. Dulles Intl are usually found in January or June, booked 72 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap 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 September 19, 2025.

Round-trip from

$134
(Kiwi.com)

One-way from

$43
(FlightHub)

Popular in

November

Cheapest in

January

Average price

$359

Good round-trip deal

$342 or less

Good one-way deal

$199 or less
From Knoxville McGhee Tyson to Washington, D.C. Dulles Intl
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One-way flight from Knoxville McGhee Tyson to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 7% potential increase in price ($24 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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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Find 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 September 19, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/18. 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.
Mon 10/137:02 pmTYS - IAD
Nonstop1h 44mAllegiant Air
Fri 10/179:36 pmIAD - TYS
Nonstop1h 40mAllegiant Air
Deal found 9/18$134
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/157:26 pmTYS - IAD
Nonstop1h 44mUnited Airlines
Wed 10/228:45 amIAD - TYS
Nonstop1h 44mUnited Airlines
Deal found 9/17$189
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/245:59 pmTYS - IAD
Nonstop1h 44mAllegiant Air
Mon 10/2712:09 pmIAD - TYS
1 stop5h 53mAllegiant Air
Deal found 9/18$194
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/19:55 amTYS - IAD
Nonstop1h 44mUnited Airlines
Sat 10/48:45 amIAD - TYS
Nonstop1h 44mUnited Airlines
Deal found 9/17$199
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/155:44 amTYS - IAD
1 stop3h 32mDelta
Wed 10/226:00 amIAD - TYS
1 stop4h 45mDelta
Deal found 9/17$209
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/172:16 pmTYS - IAD
Nonstop1h 44mUnited Airlines
Sun 10/1912:59 pmIAD - TYS
Nonstop1h 46mUnited Airlines
Deal found 9/17$217
This Delta deal was found by Cheapflights users on 9/17. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/15:45 amTYS - IAD
1 stop5h 55mDelta
Sat 10/45:25 pmIAD - TYS
1 stop6h 19mDelta
Deal found 9/17$219
This United Airlines deal was found by Cheapflights users on 9/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/192:25 pmTYS - IAD
Nonstop1h 43mUnited Airlines
Wed 11/1910:15 pmIAD - TYS
Nonstop1h 44mUnited Airlines
Deal found 9/16$231
This Delta deal was found by Cheapflights users on 9/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/248:10 pmTYS - IAD
1 stop4h 02mDelta
Mon 10/277:35 pmIAD - TYS
1 stop4h 11mDelta
Deal found 9/18$234
This Mytrip deal was found by Cheapflights users on 9/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/177:02 pmTYS - IAD
Nonstop1h 44mAllegiant Air
Sun 10/198:13 pmIAD - TYS
2 stops21h 27mAllegiant Air
Deal found 9/17$248

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 September 19, 2025.
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

Sat 10/25

9:55 am-11:39 am

Nonstop1h 44m

Washington, D.C. Dulles Intl

Wed 10/29

10:15 pm-11:59 pm

Nonstop1h 44m

$189

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 11/14

8:05 pm-12:18 am

1 stop4h 13m

Washington, D.C. Dulles Intl

Mon 11/17

7:21 pm-11:52 pm

1 stop4h 31m

$209

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Wed 10/1

5:45 am-11:40 am

1 stop5h 55m

Washington, D.C. Dulles Intl

Sat 10/4

5:25 pm-11:44 pm

1 stop6h 19m

$219

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 9/25

8:30 am-6:24 pm

1 stop9h 54m

Washington, D.C. Dulles Intl

Mon 9/29

7:14 pm-10:35 am

1 stop15h 21m

$230

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 10/17

2:16 pm-4:00 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 10/19

7:24 pm-9:11 pm

Nonstop1h 47m

$230

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Wed 11/19

2:25 pm-4:08 pm

Nonstop1h 43m

Washington, D.C. Dulles Intl

Wed 11/19

10:15 pm-11:59 pm

Nonstop1h 44m

$231

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 10/24

8:10 pm-12:12 am

1 stop4h 02m

Washington, D.C. Dulles Intl

Mon 10/27

7:35 pm-11:46 pm

1 stop4h 11m

$234

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 12/11

7:59 pm-12:16 am

1 stop4h 17m

Washington, D.C. Dulles Intl

Mon 1/19

5:00 pm-9:32 pm

1 stop4h 32m

$234

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 9/25

9:55 am-11:39 am

Nonstop1h 44m

Washington, D.C. Dulles Intl

Mon 9/29

7:24 pm-9:11 pm

Nonstop1h 47m

$249

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 9/25

9:55 am-11:39 am

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 9/28

8:45 am-10:29 am

Nonstop1h 44m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

Showing 1-10 of 21 results
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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 September 12, 2025.

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 72 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, August is the cheapest month in which you can book a flight from Knoxville to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Knoxville to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 September 19, 2025.

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 morning. If you’re flexible enough to do this you can expect to save up to 51% 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 September 19, 2025.
Get a feel of what it's like to fly with Delta, 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.
Delta
8.0
Very good
7,964 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,964 reviews
Delta
8.0
Very good
7,964 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,926 reviews
Delta
8.0
Very good
7,964 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Allegiant Air
7.2
Good
699 reviews
Delta
8.0
Very good
7,964 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.9

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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 18 flights from McGhee Tyson to Washington, D.C. Dulles Intl per day from 3 different airlines.

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

    United Airlines and Delta can get you from Knoxville to Washington, D.C. Dulles Intl Airport in just under 1h 44m. Your travel time can differ by up to 2h 29m. Airlines will cover a distance of 419 mi. This flight may include one or multiple stops.

  • 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. Other airlines that can offer you cheap pricing are Delta, from $132, and United Airlines, from $217. These flights start at 86% 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 Ethiopian Air (97%), Copa Airlines (87%) and Allegiant Air (86%).

  • 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 $83. While the most popular route (Knoxville McGhee Tyson - Washington, D.C. Dulles Intl) can be booked for $84 on average, our data indicates $1,539 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, August is the cheapest month in which you can book a flight from Knoxville to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Knoxville to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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
Woodbridge
Arlington
Alexandria
Tysons
Silver Spring
Springfield
Gaithersburg
Fredericksburg
Linthicum Heights
Fairfax
Falls Church
Owings Mills
Manassas
Rockville
Hanover
Oxon Hill
Laurel
Towson
National Harbor
Dundalk

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Top 3 airlines flying from Knoxville to Dulles Intl

Discover the top 3 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 September 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$43Average$90FlexibilityNo cancel feeOn-time88%
DeltaCheapest$132Average$208FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$217Average$339FlexibilityNo cancel feeOn-time69%

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