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Cheap flights from Knoxville to Washington, D.C. from $40

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Knoxville to Washington, D.C. departing on 2/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Enter your travel dates to find the best prices.
Allegiant Air Logo
5:56 pm - 7:40 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
8:27 pm - 10:07 pm
IAD
-
TYS
1h 40mnonstop
$80Allegiant Air
Sun, Feb 22 - Sun, Mar 1
Allegiant Air Logo
5:53 pm - 7:37 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
9:54 am - 11:34 am
IAD
-
TYS
1h 40mnonstop
$84Allegiant Air
Sun, Mar 1 - Sun, Mar 8
Allegiant Air Logo
5:53 pm - 7:37 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
9:54 am - 11:34 am
IAD
-
TYS
1h 40mnonstop
$86Allegiant Air
Sun, Mar 1 - Sun, Mar 8
Allegiant Air Logo
11:27 am - 1:11 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
2:01 pm - 3:41 pm
IAD
-
TYS
1h 40mnonstop
$104Allegiant Air
Thu, Apr 9 - Sun, Apr 26
Allegiant Air Logo
6:30 am - 8:14 am
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
3:42 pm - 5:22 pm
IAD
-
TYS
1h 40mnonstop
$114Allegiant Air
Sun, Mar 15 - Thu, Mar 19
Allegiant Air Logo
1:21 pm - 3:05 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
4:09 pm - 5:49 pm
IAD
-
TYS
1h 40mnonstop
$141Allegiant Air
Thu, Mar 26 - Sun, Mar 29
Allegiant Air Logo
7:20 am - 9:04 am
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
9:04 am - 10:44 am
IAD
-
TYS
1h 40mnonstop
$144Allegiant Air
Sun, Mar 8 - Thu, Mar 12
Allegiant Air Logo
7:20 am - 9:04 am
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
9:04 am - 10:44 am
IAD
-
TYS
1h 40mnonstop
$151Allegiant Air
Sun, Mar 8 - Sun, Mar 15
Multiple Airlines Logo
6:51 pm - 9:34 am
TYS
-
IAD
14h 43m
2 stops
Multiple Airlines Logo
8:27 pm - 10:07 pm
IAD
-
TYS
1h 40mnonstop
$167Multiple Airlines
Fri, Feb 27 - Sun, Mar 1
Multiple Airlines Logo
12:37 pm - 12:36 am
TYS
-
IAD
11h 59m
2 stops
Multiple Airlines Logo
2:01 pm - 3:41 pm
IAD
-
TYS
1h 40mnonstop
$181Multiple Airlines
Thu, Apr 9 - Sun, Apr 26

Allegiant Air flights from Knoxville to Washington, D.C. Dulles Intl Airport

Our best Allegiant Air deals on Knoxville to Washington, D.C. Dulles Intl Airport flight tickets
Allegiant Air
Feb 22
TYS5:56 pmKnoxville McGhee Tyson
1h 44m
IAD7:40 pmWashington, D.C. Dulles Intl
Mar 1
IAD8:27 pmWashington, D.C. Dulles Intl
1h 40m
TYS10:07 pmKnoxville McGhee Tyson
$80
Allegiant Air
Mar 1
TYS5:53 pmKnoxville McGhee Tyson
1h 44m
IAD7:37 pmWashington, D.C. Dulles Intl
Mar 8
IAD9:54 amWashington, D.C. Dulles Intl
1h 40m
TYS11:34 amKnoxville McGhee Tyson
$84
Allegiant Air
Mar 1
TYS5:53 pmKnoxville McGhee Tyson
1h 44m
IAD7:37 pmWashington, D.C. Dulles Intl
Mar 8
IAD9:54 amWashington, D.C. Dulles Intl
1h 40m
TYS11:34 amKnoxville McGhee Tyson
$86

United Airlines flights from Knoxville to Washington, D.C. Dulles Intl Airport

Our best United Airlines deals on Knoxville to Washington, D.C. Dulles Intl Airport flight tickets
United Airlines
Feb 17
TYS7:25 pmKnoxville McGhee Tyson
1h 46m
IAD9:11 pmWashington, D.C. Dulles Intl
Feb 21
IAD1:20 pmWashington, D.C. Dulles Intl
1h 55m
TYS3:15 pmKnoxville McGhee Tyson
$183
United Airlines
Feb 20
TYS7:25 pmKnoxville McGhee Tyson
1h 46m
IAD9:11 pmWashington, D.C. Dulles Intl
Feb 22
IAD9:00 amWashington, D.C. Dulles Intl
1h 49m
TYS10:49 amKnoxville McGhee Tyson
$189
United Airlines
May 27
TYS5:50 amKnoxville McGhee Tyson
1h 43m
IAD7:33 amWashington, D.C. Dulles Intl
May 30
IAD10:19 pmWashington, D.C. Dulles Intl
1h 40m
TYS11:59 pmKnoxville McGhee Tyson
$204

momondo Fare Finder

 
Customize your flight search to find flights from Knoxville to Washington, D.C. Dulles Intl Airport 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, momondo users made 832,500 searches. Data last updated January 27, 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

Fly to

Route

Depart

Return

Price

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sun 2/22

5:56 pm-7:40 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 3/1

8:27 pm-10:07 pm

Nonstop1h 40m

$80

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sun 3/1

5:53 pm-7:37 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 3/8

9:54 am-11:34 am

Nonstop1h 40m

$84

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sun 3/1

5:53 pm-7:37 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 3/8

9:54 am-11:34 am

Nonstop1h 40m

$86

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 4/9

11:27 am-1:11 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 4/26

2:01 pm-3:41 pm

Nonstop1h 40m

$104

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sun 3/15

6:30 am-8:14 am

Nonstop1h 44m

Washington, D.C. Dulles Intl

Thu 3/19

3:42 pm-5:22 pm

Nonstop1h 40m

$114

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 3/26

1:21 pm-3:05 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 3/29

4:09 pm-5:49 pm

Nonstop1h 40m

$141

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sun 3/8

7:20 am-9:04 am

Nonstop1h 44m

Washington, D.C. Dulles Intl

Thu 3/12

9:04 am-10:44 am

Nonstop1h 40m

$144

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sun 3/8

7:20 am-9:04 am

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 3/15

9:04 am-10:44 am

Nonstop1h 40m

$151

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 2/27

6:51 pm-9:34 am

2 stops14h 43m

Washington, D.C. Dulles Intl

Sun 3/1

8:27 pm-10:07 pm

Nonstop1h 40m

$167

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 4/9

12:37 pm-12:36 am

2 stops11h 59m

Washington, D.C. Dulles Intl

Sun 4/26

2:01 pm-3:41 pm

Nonstop1h 40m

$181

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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How to get the cheapest flight ticket from Knoxville to Washington, D.C. Dulles Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between Knoxville and Washington, D.C. Dulles Intl Airport?

What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?

In general, December is the cheapest month to fly from Knoxville to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $239. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of December, then flying in June is also cheap. Prices for this month can be found on momondo for an average of $254.

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Friday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $667. When flying out on a Saturday, the most expensive travel day of the week, you can expect to see flight prices from Knoxville to Washington, D.C. Dulles Intl Airport for around $886.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from Knoxville in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $151 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $870 on average. Flights to Washington, D.C. Dulles Intl Airport from Knoxville at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Knoxville McGhee Tyson to Washington, D.C. Dulles Intl flight route?

Fly from Knoxville McGhee Tyson to Washington, D.C. Dulles Intl for the best Knoxville McGhee Tyson - Washington, D.C. Dulles Intl flight prices

How far in advance should I book a flight to Washington, D.C. Dulles Intl Airport?

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Knoxville when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $300 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Knoxville for as low as $149 on momondo.

What cabin class options are available on Knoxville McGhee Tyson to Washington, D.C. Dulles Intl flights?

There are 4 cabin classes available to choose from on Knoxville McGhee Tyson to Washington, D.C. Dulles Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Knoxville to Washington, D.C. Dulles Intl Airport flight prices changed over time?

As of January 2026, prices for Knoxville to Washington, D.C. Dulles Intl Airport flights are approximately 42% cheaper when compared to flights at the same time last year.

When to book flights from Knoxville to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Knoxville to Washington, D.C. Dulles Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Knoxville to Washington, D.C. Dulles Intl Airport (TYS to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Knoxville to Washington, D.C. Dulles Intl Airport

Best Price Found

$87

Fastest flight time

1h 25m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from Knoxville in the past 72 hours is $87. The best round-trip flight deal from Knoxville to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $373.
The fastest flight from Knoxville to Washington, D.C. Dulles Intl Airport takes 1h 25m
Direct flights go from Knoxville to Washington, D.C. Dulles Intl Airport every day.
Search flight deals

  • How far is Knoxville McGhee Tyson to Washington, D.C. Dulles Intl by plane?

    Washington, D.C. Dulles Intl is 410.2 mi away from Knoxville McGhee Tyson. In terms of flight time, this usually takes a little over 1h 25m.

  • When did momondo last update prices for flights from Knoxville McGhee Tyson Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Knoxville McGhee Tyson Airport to Washington, D.C. Dulles Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Knoxville McGhee Tyson Airport to Washington, D.C. Dulles Intl Airport?

  • How old do you have to be to fly from Knoxville McGhee Tyson Airport to Washington, D.C. Dulles Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Knoxville McGhee Tyson Airport to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The required travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Washington, D.C. Dulles Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Knoxville to Washington, D.C. Dulles Intl Airport?

  • What is the most popular airline from Knoxville to Washington, D.C. Dulles Intl Airport?

Best airlines flying from Knoxville to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Knoxville to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
Allegiant AirPriceFrom $43Free CancellationRating
7.2
706 reviews
Search Allegiant Air flights
United AirlinesPriceFrom $194Free CancellationRating
7.4
9,207 reviews
Search United Airlines flights

  • United Airlines Flights From Knoxville to Washington, D.C. Dulles Intl Airport

    United Airlines flight deals from Knoxville to Washington, D.C. Dulles Intl Airport start from $194 round-trip. Over the 20 United Airlines flights for this route in a normal week, average airfare is usually $330 round-trip - but some users have found much cheaper deals with momondo.

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Winchester
Waldorf
Woodbridge
Tysons
Laurel
Colonial Beach
Silver Spring
Towson
Fredericksburg
Gaithersburg
Rockville
Manassas
Springfield
Sterling
Fairfax
Linthicum Heights

Why use momondo?

Why should I use momondo to find a flight deal from Knoxville to Washington, D.C.?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Knoxville to Washington, D.C.. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Knoxville to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Washington, D.C. from Knoxville with this policy.

How can momondo help me find flights from Knoxville to Washington, D.C.?

Once all potential Knoxville to Washington, D.C. flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Knoxville to Washington, D.C. right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Knoxville to Washington, D.C. flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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