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Dulles Intl

$40+ 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 8/8. Fares are subject to change and may not be available on all flights or dates of travel.
TYS — IAD
Aug 3 — Aug 101
Sun 8/3
Sun 8/10
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 23 days in advance, depart on a Tuesday or Thursday and return on a Monday

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 July 29, 2025.

Round-trip from

$80
(Booking.com)

One-way from

$40
(Mytrip)

Popular in

November

Cheapest in

January

Average price

$306

Good round-trip deal

$482 or less

Good one-way deal

$204 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. 11% potential increase in price ($42 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 29, 2025.

This Booking.com deal was found by Cheapflights users on 7/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1112:45 pmTYS - IAD
Nonstop1h 38mAllegiant Air
Fri 8/153:13 pmIAD - TYS
Nonstop1h 34mAllegiant Air
Deal found 7/27$80
This Mytrip deal was found by Cheapflights users on 7/27. 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 8/221:22 pmTYS - IAD
2 stops23h 42mMultiple Airlines
Mon 8/253:13 pmIAD - TYS
Nonstop1h 34mMultiple Airlines
Deal found 7/27$188
This United Airlines deal was found by Cheapflights users on 7/28. 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 8/209:55 amTYS - IAD
Nonstop1h 43mUnited Airlines
Tue 9/210:11 pmIAD - TYS
Nonstop1h 46mUnited Airlines
Deal found 7/28$189
This Delta deal was found by Cheapflights users on 7/28. 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 8/275:45 amTYS - IAD
1 stop5h 38mDelta
Sat 8/306:00 amIAD - TYS
1 stop4h 27mDelta
Deal found 7/28$204
This American Airlines deal was found by Cheapflights users on 7/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/206:05 amTYS - IAD
1 stop3h 48mAmerican Airlines
Tue 9/27:44 amIAD - TYS
1 stop5h 19mAmerican Airlines
Deal found 7/28$251

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 July 29, 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

Fri 8/22

12:45 pm-2:23 pm

Nonstop1h 38m

Washington, D.C. Dulles Intl

Mon 8/25

3:13 pm-4:47 pm

Nonstop1h 34m

$80

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 8/22

1:22 pm-1:04 pm

2 stops23h 42m

Washington, D.C. Dulles Intl

Mon 8/25

3:13 pm-4:47 pm

Nonstop1h 34m

$182

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 9/5

9:55 am-11:38 am

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sun 9/7

10:11 pm-11:57 pm

Nonstop1h 46m

$189

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Wed 8/27

5:45 am-11:23 am

1 stop5h 38m

Washington, D.C. Dulles Intl

Sat 8/30

6:00 am-10:27 am

1 stop4h 27m

$204

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Tue 8/19

7:35 pm-10:56 pm

1 stop3h 21m

Washington, D.C. Dulles Intl

Wed 8/20

7:44 am-11:22 am

1 stop3h 38m

$251

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 8/8

12:45 pm-2:23 pm

Nonstop1h 38m

$40

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sat 8/30

6:14 pm-11:21 pm

1 stop5h 07m

$100

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Tue 8/26

7:25 pm-9:08 pm

Nonstop1h 43m

$116

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Wed 8/20

10:54 am-10:44 am

2 stops23h 50m

$145

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 8/29

5:06 am-8:39 am

1 stop3h 33m

$254

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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 July 25, 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 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, August is the cheapest month in which you can book a flight from Knoxville to Washington, D.C. Dulles Intl Airport (average of $309). 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 July 29, 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 53% on your trip compared to booking a flight in the afternoon.

Weekly flight availability from Knoxville to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Knoxville to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 29, 2025.

The most flights from TYS to IAD are scheduled on a Monday (21 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (19 on average).

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 July 29, 2025.
Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines 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
7,979 reviews

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Boarding

8.2

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
7,979 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Boarding

8.2

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
8,896 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Boarding

8.2

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!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Boarding

8.2

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
702 reviews
Delta
8.0
Very good
7,979 reviews

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Entertainment

7.9

Boarding

8.2

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

  • 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 $80. Other airlines that can offer you cheap pricing are United Airlines, from $189, and Delta, from $204. These flights start at 75% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Knoxville to Washington, D.C. Dulles Intl Airport one-way?

    For one-way options, check prices for Allegiant Air. According to our data, you can fly for as low as $40. Users have also found prices from $100 and $116 on Delta and United Airlines, respectively.

  • 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 (95%), Allegiant Air (94%) and Copa Airlines (81%).

  • 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 $40. While the most popular route (Knoxville McGhee Tyson - Washington, D.C. Dulles Intl) can be booked for $83 on average our data indicates $1,733 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 $309). 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
Fredericksburg
Gaithersburg
Towson
Linthicum Heights
Easton
Fairfax
Manassas
Falls Church
Waldorf
Laurel
Rockville
Oxon Hill
National Harbor
Dundalk
Bowie

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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 July 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Allegiant AirCheapest$42Average$83FlexibilityNo cancel feeOn-time88%
DeltaCheapest$200Average$208FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$221Average$335FlexibilityNo cancel feeOn-time69%

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