Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Knoxville to Washington, D.C. from $46

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 12/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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
1:39 pm - 3:23 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
4:13 pm - 5:53 pm
IAD
-
TYS
1h 40mnonstop
$80Allegiant Air
Thu, Jan 8 - Sun, Jan 11
Allegiant Air Logo
1:39 pm - 3:23 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
4:13 pm - 5:53 pm
IAD
-
TYS
1h 40mnonstop
$81Allegiant Air
Thu, Jan 15 - Sun, Jan 18
Allegiant Air Logo
1:39 pm - 3:23 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
4:13 pm - 5:53 pm
IAD
-
TYS
1h 40mnonstop
$83Allegiant Air
Thu, Jan 8 - Sun, Jan 25
Allegiant Air Logo
12:01 pm - 1:45 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
4:57 pm - 6:37 pm
IAD
-
TYS
1h 40mnonstop
$86Allegiant Air
Wed, Dec 31 - Sat, Jan 3
Allegiant Air Logo
6:11 pm - 7:55 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
8:30 pm - 10:10 pm
IAD
-
TYS
1h 40mnonstop
$93Allegiant Air
Sun, Feb 15 - Sun, Feb 22
Allegiant Air Logo
5:42 pm - 7:26 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
2:35 pm - 4:15 pm
IAD
-
TYS
1h 40mnonstop
$105Allegiant Air
Thu, Dec 18 - Wed, Dec 24
Multiple Airlines Logo
7:26 pm - 11:07 am
TYS
-
IAD
39h 41m2 stops
Multiple Airlines Logo
4:13 pm - 5:53 pm
IAD
-
TYS
1h 40mnonstop
$152Multiple Airlines
Thu, Jan 15 - Thu, Jan 22
Allegiant Air Logo
5:56 pm - 7:40 pm
TYS
-
IAD
1h 44mnonstop
Allegiant Air Logo
3:46 pm - 9:28 pm
IAD
-
TYS
5h 42m1 stop
$154Allegiant Air
Thu, Feb 19 - Mon, Feb 23
Allegiant Air Logo
9:42 pm - 2:56 pm
TYS
-
IAD
17h 14m1 stop
Allegiant Air Logo
8:27 pm - 10:07 pm
IAD
-
TYS
1h 40mnonstop
$155Allegiant Air
Thu, Feb 26 - Sun, Mar 1
Multiple Airlines Logo
6:18 pm - 8:38 am
TYS
-
IAD
14h 20m1 stop
Multiple Airlines Logo
4:13 pm - 5:53 pm
IAD
-
TYS
1h 40mnonstop
$169Multiple Airlines
Fri, Jan 16 - Sun, Jan 25

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
Jan 8
TYS1:39 pmKnoxville McGhee Tyson
1h 44m
IAD3:23 pmWashington, D.C. Dulles Intl
Jan 11
IAD4:13 pmWashington, D.C. Dulles Intl
1h 40m
TYS5:53 pmKnoxville McGhee Tyson
$80
Find similar
Allegiant Air
Jan 15
TYS1:39 pmKnoxville McGhee Tyson
1h 44m
IAD3:23 pmWashington, D.C. Dulles Intl
Jan 18
IAD4:13 pmWashington, D.C. Dulles Intl
1h 40m
TYS5:53 pmKnoxville McGhee Tyson
$81
Find similar
Allegiant Air
Jan 8
TYS1:39 pmKnoxville McGhee Tyson
1h 44m
IAD3:23 pmWashington, D.C. Dulles Intl
Jan 25
IAD4:13 pmWashington, D.C. Dulles Intl
1h 40m
TYS5:53 pmKnoxville McGhee Tyson
$83
Find similar

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

Our best American Airlines deals on Knoxville to Washington, D.C. Dulles Intl Airport flight tickets
American Airlines
Jan 8
TYS5:14 pmKnoxville McGhee Tyson
5h 58m
1 stop
IAD11:12 pmWashington, D.C. Dulles Intl
Jan 11
IAD7:04 amWashington, D.C. Dulles Intl
4h 43m
1 stop
TYS11:47 amKnoxville McGhee Tyson
$257
Find similar
American Airlines
Dec 26
TYS5:00 amKnoxville McGhee Tyson
3h 42m
1 stop
IAD8:42 amWashington, D.C. Dulles Intl
Jan 1
IAD1:57 pmWashington, D.C. Dulles Intl
5h 44m
1 stop
TYS7:41 pmKnoxville McGhee Tyson
$278
Find similar
American Airlines
Mar 5
TYS5:00 amKnoxville McGhee Tyson
3h 43m
1 stop
IAD8:43 amWashington, D.C. Dulles Intl
Mar 8
IAD5:00 amWashington, D.C. Dulles Intl
3h 42m
1 stop
TYS8:42 amKnoxville McGhee Tyson
$287
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 December 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

Thu 1/8

1:39 pm-3:23 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 1/11

4:13 pm-5:53 pm

Nonstop1h 40m

$80

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 1/15

1:39 pm-3:23 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 1/18

4:13 pm-5:53 pm

Nonstop1h 40m

$81

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 1/8

1:39 pm-3:23 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 1/25

4:13 pm-5:53 pm

Nonstop1h 40m

$83

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Wed 12/31

12:01 pm-1:45 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sat 1/3

4:57 pm-6:37 pm

Nonstop1h 40m

$86

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Sun 2/15

6:11 pm-7:55 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Sun 2/22

8:30 pm-10:10 pm

Nonstop1h 40m

$93

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 12/18

5:42 pm-7:26 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Wed 12/24

2:35 pm-4:15 pm

Nonstop1h 40m

$105

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 1/15

7:26 pm-11:07 am

2 stops39h 41m

Washington, D.C. Dulles Intl

Thu 1/22

4:13 pm-5:53 pm

Nonstop1h 40m

$152

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 2/19

5:56 pm-7:40 pm

Nonstop1h 44m

Washington, D.C. Dulles Intl

Mon 2/23

3:46 pm-9:28 pm

1 stop5h 42m

$154

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Thu 2/26

9:42 pm-2:56 pm

1 stop17h 14m

Washington, D.C. Dulles Intl

Sun 3/1

8:27 pm-10:07 pm

Nonstop1h 40m

$155

KnoxvilleWashington, D.C.

TYS - IAD

TYSIAD

Knoxville McGhee Tyson

Fri 1/16

6:18 pm-8:38 am

1 stop14h 20m

Washington, D.C. Dulles Intl

Sun 1/25

4:13 pm-5:53 pm

Nonstop1h 40m

$169

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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, June 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 $254. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of June, then flying in July is also cheap. Prices for this month can be found on momondo for an average of $255.

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 $695. 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 $911.

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 $170 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 $974 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 $293 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 December 2025, prices for Knoxville to Washington, D.C. Dulles Intl Airport flights are approximately 54% 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

$208

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 $208. The best round-trip flight deal from Knoxville to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $351.
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 $44Free CancellationRating
7.2
699 reviews
Search Allegiant Air flights
United AirlinesPriceFrom $194Free CancellationRating
7.4
9,095 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 17 United Airlines flights for this route in a normal week, average airfare is usually $339 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 $44 round-trip, depending on your selected dates, with average Allegiant Air deals seen on momondo around $90. Allegiant Air operates 1 flight to Washington, D.C. Dulles Intl Airport from Knoxville in an average week. Users have rated it 7.2/10 across 699 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
Woodbridge
Waldorf
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Harpers Ferry
Rockville
Gaithersburg
Reston
Manassas
Sterling
Fairfax

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.

An easier way to manage your Washington, D.C. Dulles Intl Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 1/10
Sat 1/17
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Washington, D.C.