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Cheap flights from Knoxville to Washington, D.C. from $36

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 7/20. 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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Find the cheapest flights from Knoxville to Washington, D.C.

Cheap round-trip flights

Enter your travel dates to find the best prices.
Allegiant Air Logo
12:49 pm - 2:16 pm
TYS
-
IAD
1h 27mnonstop
Allegiant Air Logo
3:06 pm - 4:40 pm
IAD
-
TYS
1h 34mnonstop
$78Allegiant Air
Fri, Jun 5 - Fri, Jun 12
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
Allegiant Air Logo
3:08 pm - 4:40 pm
IAD
-
TYS
1h 32mnonstop
$80Allegiant Air
Fri, May 29 - Mon, Jun 1
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
Allegiant Air Logo
3:06 pm - 4:40 pm
IAD
-
TYS
1h 34mnonstop
$81Allegiant Air
Fri, May 29 - Fri, Jun 5
Allegiant Air Logo
12:49 pm - 2:16 pm
TYS
-
IAD
1h 27mnonstop
Allegiant Air Logo
3:19 pm - 4:53 pm
IAD
-
TYS
1h 34mnonstop
$83Allegiant Air
Fri, Jun 12 - Fri, Jun 19
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
Allegiant Air Logo
3:08 pm - 4:40 pm
IAD
-
TYS
1h 32mnonstop
$93Allegiant Air
Fri, May 22 - Mon, May 25
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
$94Allegiant Air
Fri, Jul 3 - Fri, Jul 17
Allegiant Air Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
Allegiant Air Logo
3:08 pm - 4:40 pm
IAD
-
TYS
1h 32mnonstop
$98Allegiant Air
Fri, May 22 - Mon, May 25
Multiple Airlines Logo
12:55 pm - 2:18 pm
TYS
-
IAD
1h 23mnonstop
Multiple Airlines Logo
7:30 am - 9:50 pm
IAD
-
TYS
14h 20m
2 stops
$129Multiple Airlines
Mon, Jun 1 - Fri, Jun 12
Multiple Airlines Logo
12:40 pm - 11:09 pm
TYS
-
IAD
10h 29m
2 stops
Multiple Airlines Logo
3:06 pm - 4:40 pm
IAD
-
TYS
1h 34mnonstop
$131Multiple Airlines
Fri, Jun 5 - Fri, Jun 12
Allegiant Air Logo
12:40 pm - 5:59 pm
TYS
-
IAD
5h 19m
1 stop
Allegiant Air Logo
3:16 pm - 4:42 pm
IAD
-
TYS
1h 26mnonstop
$132Allegiant Air
Mon, Jun 29 - Fri, Jul 24

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
Jun 3
TYS10:10 amKnoxville McGhee Tyson
1h 45m
IAD11:55 amWashington, D.C. Dulles Intl
Jun 6
IAD12:50 pmWashington, D.C. Dulles Intl
1h 37m
TYS2:27 pmKnoxville McGhee Tyson
$189
United Airlines
May 30
TYS5:45 amKnoxville McGhee Tyson
1h 45m
IAD7:30 amWashington, D.C. Dulles Intl
Jun 1
IAD12:50 pmWashington, D.C. Dulles Intl
1h 37m
TYS2:27 pmKnoxville McGhee Tyson
$191
United Airlines
May 22
TYS5:45 amKnoxville McGhee Tyson
1h 45m
IAD7:30 amWashington, D.C. Dulles Intl
May 24
IAD9:00 amWashington, D.C. Dulles Intl
1h 42m
TYS10:42 amKnoxville McGhee Tyson
$279

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
Jun 5
TYS12:49 pmKnoxville McGhee Tyson
1h 27m
IAD2:16 pmWashington, D.C. Dulles Intl
Jun 12
IAD3:06 pmWashington, D.C. Dulles Intl
1h 34m
TYS4:40 pmKnoxville McGhee Tyson
$78
Allegiant Air
May 29
TYS12:55 pmKnoxville McGhee Tyson
1h 23m
IAD2:18 pmWashington, D.C. Dulles Intl
Jun 1
IAD3:08 pmWashington, D.C. Dulles Intl
1h 32m
TYS4:40 pmKnoxville McGhee Tyson
$80
Allegiant Air
May 29
TYS12:55 pmKnoxville McGhee Tyson
1h 23m
IAD2:18 pmWashington, D.C. Dulles Intl
Jun 5
IAD3:06 pmWashington, D.C. Dulles Intl
1h 34m
TYS4:40 pmKnoxville McGhee Tyson
$81

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 May 11, 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

Cheapest round-trip

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 6/5

12:49 pm-2:16 pm

Nonstop1h 27m

Washington, D.C. Dulles Intl

Fri 6/12

3:06 pm-4:40 pm

Nonstop1h 34m

$78
Quickest round-trip

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 5/29

12:55 pm-2:18 pm

Nonstop1h 23m

Washington, D.C. Dulles Intl

Mon 6/1

3:08 pm-4:40 pm

Nonstop1h 32m

$80

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 5/29

12:55 pm-2:18 pm

Nonstop1h 23m

Washington, D.C. Dulles Intl

Fri 6/5

3:06 pm-4:40 pm

Nonstop1h 34m

$81

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 6/12

12:49 pm-2:16 pm

Nonstop1h 27m

Washington, D.C. Dulles Intl

Fri 6/19

3:19 pm-4:53 pm

Nonstop1h 34m

$83

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 5/22

12:55 pm-2:18 pm

Nonstop1h 23m

Washington, D.C. Dulles Intl

Mon 5/25

3:08 pm-4:40 pm

Nonstop1h 32m

$93

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 7/3

12:53 pm-2:26 pm

Nonstop1h 33m

Washington, D.C. Dulles Intl

Fri 7/17

3:16 pm-4:42 pm

Nonstop1h 26m

$94

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 5/22

12:55 pm-2:18 pm

Nonstop1h 23m

Washington, D.C. Dulles Intl

Mon 5/25

3:08 pm-4:40 pm

Nonstop1h 32m

$98

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Mon 6/1

12:55 pm-2:18 pm

Nonstop1h 23m

Washington, D.C. Dulles Intl

Fri 6/12

7:30 am-9:50 pm

2 stops14h 20m

$129

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 6/5

12:40 pm-11:09 pm

2 stops10h 29m

Washington, D.C. Dulles Intl

Fri 6/12

3:06 pm-4:40 pm

Nonstop1h 34m

$131

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Mon 6/29

12:40 pm-5:59 pm

1 stop5h 19m

Washington, D.C. Dulles Intl

Fri 7/24

3:16 pm-4:42 pm

Nonstop1h 26m

$132

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington, D.C. from

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, March 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 $130. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of March, then flying in February is also cheap. Prices for this month can be found on momondo for an average of $143.

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 $454. 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 $866.

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 $104 when looking at flights departing in the afternoon. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $842 on average. Flights to Washington, D.C. Dulles Intl Airport from Knoxville in the evening 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 have Knoxville to Washington, D.C. Dulles Intl Airport flight prices changed over time?

As of May 2026, prices for Knoxville to Washington, D.C. Dulles Intl Airport flights are approximately 63% 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

$46

Fastest flight time

1h 23m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from Knoxville in the past 72 hours is $46. The best round-trip flight deal from Knoxville to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $384.
The fastest flight from Knoxville to Washington, D.C. Dulles Intl Airport takes 1h 23m
Direct flights go from Knoxville to Washington, D.C. Dulles Intl Airport every day.
Search flight deals

Frequently asked questions about flying from Knoxville to Washington, D.C. Dulles Intl Airport

  • 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 23m.

  • 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
7.3
708 reviews
Search Allegiant Air flights
United AirlinesPriceFrom $189Free CancellationRating
7.4
9,700 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 $189 round-trip. Over the 19 United Airlines flights for this route in a normal week, average airfare is usually $306 round-trip - but some users have found much cheaper deals with momondo.

  • Allegiant Air Flights From Knoxville to Washington, D.C. Dulles Intl Airport

    Allegiant Air is also a popular choice for this route. Allegiant Air flight deals for Knoxville to Washington, D.C. Dulles Intl Airport start from as low as $43 round-trip, depending on your selected dates, with average Allegiant Air deals seen on momondo around $89. Allegiant Air operates 1 flight to Washington, D.C. Dulles Intl Airport from Knoxville in an average week. Users have rated it 7.3/10 across 708 reviews.

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
Laurel
Gaithersburg
Colonial Beach
Fredericksburg
Silver Spring
Towson
Rockville
Manassas
Sterling
Linthicum Heights
Tysons
Bethesda
Springfield

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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