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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 12/14. 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

Allegiant Air Logo
7:02 pm - 8:46 pmTYS-IAD
1h 44mnonstop
Allegiant Air Logo
9:36 pm - 11:16 pmIAD-TYS
1h 40mnonstop
$114Allegiant Air
Find Deal
Mon, Oct 13 - Mon, Oct 20
Allegiant Air Logo
7:02 pm - 8:46 pmTYS-IAD
1h 44mnonstop
Allegiant Air Logo
6:13 pm - 8:10 pmIAD-TYS
25h 57m1 stop
$154Allegiant Air
Find Deal
Fri, Oct 17 - Sun, Oct 19
Logo
7:17 pm - 4:34 pmTYS-IAD
21h 17m2 stops
Logo
1:34 pm - 3:14 pmIAD-TYS
1h 40mnonstop
$170
Find Deal
Thu, Oct 30 - Mon, Nov 3
Delta Logo
5:45 am - 11:40 amTYS-IAD
5h 55m1 stop
Delta Logo
5:55 pm - 11:44 pmIAD-TYS
5h 49m1 stop
$177Delta
Find Deal
Tue, Sep 30 - Tue, Sep 30
Logo
4:47 pm - 10:19 pmTYS-IAD
29h 32m2 stops
Logo
8:16 pm - 9:56 pmIAD-TYS
1h 40mnonstop
$179
Find Deal
Mon, Dec 15 - Thu, Dec 18
United Airlines Logo
2:00 pm - 3:44 pmTYS-IAD
1h 44mnonstop
United Airlines Logo
10:10 pm - 11:59 pmIAD-TYS
1h 49mnonstop
$184United Airlines
Find Deal
Thu, Dec 25 - Tue, Dec 30
United Airlines Logo
9:50 am - 11:33 amTYS-IAD
1h 43mnonstop
United Airlines Logo
10:15 pm - 11:59 pmIAD-TYS
1h 44mnonstop
$189United Airlines
Find Deal
Thu, Oct 30 - Sun, Nov 2
Delta Logo
5:45 am - 9:09 amTYS-IAD
3h 24m1 stop
Delta Logo
7:35 pm - 11:46 pmIAD-TYS
4h 11m1 stop
$209Delta
Find Deal
Wed, Oct 1 - Mon, Oct 6
American Airlines Logo
8:04 pm - 11:59 pmTYS-IAD
3h 55m1 stop
American Airlines Logo
6:24 am - 10:19 amIAD-TYS
3h 55m1 stop
$260American Airlines
Find Deal
Sat, Nov 8 - Sun, Nov 16
American Airlines Logo
5:05 am - 10:07 amTYS-IAD
5h 02m1 stop
American Airlines Logo
8:12 pm - 12:07 amIAD-TYS
3h 55m1 stop
$269American Airlines
Find Deal
Fri, Sep 26 - Sun, Sep 28

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

Our best Delta deals on Knoxville to Washington, D.C. Dulles Intl Airport flight tickets
Delta
Sep 30
TYS5:45 amKnoxville McGhee Tyson
5h 55m
1 stop
IAD11:40 amWashington, D.C. Dulles Intl
Sep 30
IAD5:55 pmWashington, D.C. Dulles Intl
5h 49m
1 stop
TYS11:44 pmKnoxville McGhee Tyson
$177
Find similar
Delta
Oct 1
TYS5:45 amKnoxville McGhee Tyson
3h 24m
1 stop
IAD9:09 amWashington, D.C. Dulles Intl
Oct 6
IAD7:35 pmWashington, D.C. Dulles Intl
4h 11m
1 stop
TYS11:46 pmKnoxville McGhee Tyson
$209
Find similar
Delta
Dec 10
TYS5:25 amKnoxville McGhee Tyson
3h 48m
1 stop
IAD9:13 amWashington, D.C. Dulles Intl
Dec 16
IAD6:00 amWashington, D.C. Dulles Intl
3h 36m
1 stop
TYS9:36 amKnoxville McGhee Tyson
$238
Find similar

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
Dec 25
TYS2:00 pmKnoxville McGhee Tyson
1h 44m
IAD3:44 pmWashington, D.C. Dulles Intl
Dec 30
IAD10:10 pmWashington, D.C. Dulles Intl
1h 49m
TYS11:59 pmKnoxville McGhee Tyson
$184
Find similar
United Airlines
Oct 30
TYS9:50 amKnoxville McGhee Tyson
1h 43m
IAD11:33 amWashington, D.C. Dulles Intl
Nov 2
IAD10:15 pmWashington, D.C. Dulles Intl
1h 44m
TYS11:59 pmKnoxville McGhee Tyson
$189
Find similar
United Airlines
Sep 27
TYS7:26 pmKnoxville McGhee Tyson
1h 44m
IAD9:10 pmWashington, D.C. Dulles Intl
Sep 28
IAD8:45 amWashington, D.C. Dulles Intl
1h 44m
TYS10:29 amKnoxville McGhee Tyson
$199
Find similar

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 September 11, 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

Fly to

Route

Depart

Return

Price

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Mon 10/13

7:02 pm-8:46 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Mon 10/20

9:36 pm-11:16 pm

Nonstop1h 40m

$114

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 10/17

7:02 pm-8:46 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 10/19

6:13 pm-8:10 pm

1 stop25h 57m

$154

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 10/30

7:17 pm-4:34 pm

2 stops21h 17m

Washington, D.C. Dulles Intl

Mon 11/3

1:34 pm-3:14 pm

Nonstop1h 40m

$170

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Tue 9/30

5:45 am-11:40 am

1 stop5h 55m

Washington, D.C. Dulles Intl

Tue 9/30

5:55 pm-11:44 pm

1 stop5h 49m

$177

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Mon 12/15

4:47 pm-10:19 pm

2 stops29h 32m

Washington, D.C. Dulles Intl

Thu 12/18

8:16 pm-9:56 pm

Nonstop1h 40m

$179

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 12/25

2:00 pm-3:44 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Tue 12/30

10:10 pm-11:59 pm

Nonstop1h 49m

$184

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 10/30

9:50 am-11:33 am

Nonstop1h 43m

Washington, D.C. Dulles Intl

Sun 11/2

10:15 pm-11:59 pm

Nonstop1h 44m

$189

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Wed 10/1

5:45 am-9:09 am

1 stop3h 24m

Washington, D.C. Dulles Intl

Mon 10/6

7:35 pm-11:46 pm

1 stop4h 11m

$209

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sat 11/8

8:04 pm-11:59 pm

1 stop3h 55m

Washington, D.C. Dulles Intl

Sun 11/16

6:24 am-10:19 am

1 stop3h 55m

$260

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 9/26

5:05 am-10:07 am

1 stop5h 02m

Washington, D.C. Dulles Intl

Sun 9/28

8:12 pm-12:07 am

1 stop3h 55m

$269

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

In general, January 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 $249. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of January, 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 Thursday 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 $758. When flying out on a Monday, 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 $914.

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 morning is the least expensive time of day to depart. momondo users have found prices as low as $505 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,002 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 $311 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 $157 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 September 2025, prices for Knoxville to Washington, D.C. Dulles Intl Airport flights are approximately 75% more expensive 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

$214

Fastest flight time

1h 43m

Direct flights

Every day
The best one-way flight to Washington, D.C. Dulles Intl Airport from Knoxville in the past 72 hours is $214. The best round-trip flight deal from Knoxville to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $378.
The fastest flight from Knoxville to Washington, D.C. Dulles Intl Airport takes 1h 43m
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 43m.

  • 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
702 reviews
Search Allegiant Air flights
United AirlinesPriceFrom $215Free CancellationRating
7.4
8,937 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 $215 round-trip. Over the 27 United Airlines flights for this route in a normal week, average airfare is usually $335 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
Gettysburg
National Harbor
Arlington
Winchester
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Harpers Ferry
Towson
Rockville
Manassas
Reston
Fairfax
Gaithersburg
Glen Burnie

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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