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Dulles Intl

$82+ Cheap flights from Key Largo, FL 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.
MIA — IAD
Jul 27 — Aug 31
Mon 7/27
Mon 8/3
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Washington, D.C. Dulles Intl are usually found in November or January, booked 81 days in advance, depart on a Friday or Thursday and return on a Monday

Cheap flight deals from Key Largo to Dulles Intl

Cheapest flights from Key Largo to Dulles Intl
Explore the most affordable flight options available from Key Largo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 27, 2026.

This Kiwi.com deal was found by Cheapflights users on 6/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1811:10 am
MIA
-
IAD
1 stop6h 04m
Frontier
Wed 8/196:20 am
IAD
-
MIA
1 stop7h 12m
Frontier
Deal found 6/25$167
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/510:50 am
MIA
-
IAD
1 stop6h 24m
Frontier
Wed 8/127:48 am
IAD
-
MIA
1 stop6h 05m
Frontier
Deal found 6/24$169
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1210:50 am
MIA
-
IAD
1 stop6h 24m
Frontier
Tue 8/186:20 am
IAD
-
MIA
1 stop7h 12m
Frontier
Deal found 6/23$170
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:30 am
MIA
-
IAD
1 stop8h 10m
Frontier
Wed 7/297:49 am
IAD
-
MIA
1 stop6h 04m
Frontier
Deal found 6/23$172
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:30 am
MIA
-
IAD
1 stop8h 10m
Frontier
Tue 7/287:49 am
IAD
-
MIA
1 stop6h 04m
Frontier
Deal found 6/24$173
This Kiwi.com deal was found by Cheapflights users on 6/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:30 am
MIA
-
IAD
1 stop8h 04m
Frontier
Sat 8/16:49 am
IAD
-
MIA
1 stop7h 04m
Frontier
Deal found 6/25$174
This Kiwi.com deal was found by Cheapflights users on 6/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/48:30 am
MIA
-
IAD
1 stop8h 10m
Frontier
Sat 8/86:49 am
IAD
-
MIA
1 stop7h 04m
Frontier
Deal found 6/26$175
This Kiwi.com deal was found by Cheapflights users on 6/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:10 am
MIA
-
IAD
1 stop14h 42m
Frontier
Sat 9/197:00 am
IAD
-
MIA
1 stop14h 04m
Frontier
Deal found 6/25$179
This WAYA deal was found by Cheapflights users on 6/24. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/183:07 pm
MIA
-
IAD
1 stop7h 48m
Frontier
Wed 7/227:49 am
IAD
-
MIA
1 stop6h 04m
Frontier
Deal found 6/24$180
This Kiwi.com deal was found by Cheapflights users on 6/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:30 am
MIA
-
IAD
1 stop8h 10m
Frontier
Tue 8/117:48 am
IAD
-
MIA
1 stop6h 05m
Frontier
Deal found 6/27$187
This Kiwi.com deal was found by Cheapflights users on 6/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/58:30 am
MIA
-
IAD
1 stop8h 44m
Frontier
Sun 8/97:48 am
IAD
-
MIA
1 stop6h 05m
Frontier
Deal found 6/27$188
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/148:30 am
MIA
-
IAD
1 stop8h 10m
Frontier
Fri 7/178:33 pm
IAD
-
MIA
1 stop23h 56m
Frontier
Deal found 6/24$189

Find flight deals from Key Largo to Dulles Intl

Keep the following information in mind while searching for Key Largo to Dulles Intl flight deals. Data was last updated June 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$167
(Kiwi.com)

One-way from

$82
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$315
Provider with most accurate pricing for Miami-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-Washington, D.C. (WAS) flights.
Search Deals
From Key Largo to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Key Largo to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 25% potential increase in price ($65 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo 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 June 27, 2026.
Use the filters below to find and compare flights from Key Largo to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Sat 7/11

7:16 pm-12:41 am

1 stop5h 25m

Washington, D.C. Dulles Intl

Mon 7/13

5:46 pm-11:39 pm

1 stop5h 53m

$219

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Tue 7/21

7:25 pm-12:41 am

1 stop5h 16m

Washington, D.C. Dulles Intl

Tue 7/28

5:46 pm-12:55 am

1 stop7h 09m

$219

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Thu 7/23

11:25 am-6:19 pm

1 stop6h 54m

Washington, D.C. Dulles Intl

Mon 7/27

6:00 am-12:28 pm

1 stop6h 28m

$219

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Thu 7/16

1:10 pm-3:53 pm

Nonstop2h 43m

Washington, D.C. Dulles Intl

Sat 7/18

8:45 am-11:35 am

Nonstop2h 50m

$258

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Thu 7/30

7:10 am-11:37 am

1 stop4h 27m

Washington, D.C. Dulles Intl

Sun 8/2

7:26 pm-12:55 am

1 stop5h 29m

$264
Quickest round-trip

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Fri 9/4

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Mon 9/7

8:16 am-11:11 am

Nonstop2h 55m

$269

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Wed 7/22

5:22 pm-11:19 pm

1 stop5h 57m

Washington, D.C. Dulles Intl

Sat 7/25

8:45 am-11:35 am

Nonstop2h 50m

$279

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Thu 7/16

8:48 am-4:32 pm

1 stop7h 44m

Washington, D.C. Dulles Intl

Sun 7/19

8:45 am-11:35 am

Nonstop2h 50m

$281

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Thu 7/23

8:48 am-4:32 pm

1 stop7h 44m

Washington, D.C. Dulles Intl

Mon 7/27

8:45 am-11:35 am

Nonstop2h 50m

$289

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Tue 7/21

8:48 am-4:32 pm

1 stop7h 44m

Washington, D.C. Dulles Intl

Tue 7/28

8:45 am-11:35 am

Nonstop2h 50m

$289

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/26

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Key Largo to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Key Largo 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 Key Largo to Washington, D.C. Dulles Intl Airport

What is the cheapest time of day to fly from KE9 to IAD?

Find hourly flight availability from Key Largo 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 June 27, 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Key Largo to Washington, D.C. Dulles Intl Airport as you normally would.

How much does it cost to fly round-trip from Key Largo to Washington, D.C. Dulles Intl Airport?

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 June 27, 2026.
Read through reviews of airlines operating flights from Key Largo to Washington, D.C. Dulles Intl Airport, such as United Airlines and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,901 reviews

Food

6.6

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,901 reviews
United Airlines
7.4
Good
9,901 reviews

Food

6.6

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
Frontier
5.6
Fair
2,858 reviews
United Airlines
7.4
Good
9,901 reviews

Food

6.6

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Key Largo to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Key Largo to Washington, D.C. Dulles Intl Airport?

    Departing from Key Largo to Washington, D.C. Dulles Intl Airport will take you 2h 43m. Airlines will cover a distance of 923 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $35. United Airlines flights start at $78 while deals on JetBlue start at $88 one-way.

  • What are the cheapest flights from Key Largo to Washington, D.C. Dulles Intl Airport?

    While on average a flight from Key Largo to Washington, D.C. Dulles Intl Airport is generally $642, our data shows the cheapest flight currently is $188. When looking at the most popular route, (Miami - Washington, D.C. Dulles Intl), you can expect to pay $209 for that flight.

  • Can I find deals for flights from Key Largo to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Key Largo to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Key Largo to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Key Largo to Dulles Intl.

  • Can I find deals for business class flights from Key Largo to Dulles Intl?

    Yes. Cheapflights offers flight deals from Key Largo 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.

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
Alexandria
Arlington
Tysons
Owings Mills
Springfield
Lanham
Reston
Herndon
Rockville
Hyattsville
Falls Church
Laurel
Fredericksburg
Hanover
Chantilly
Manassas
Waldorf
Silver Spring
Largo
Clinton

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Key Largo to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Orlando to Baltimore flights
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Pensacola to Baltimore flights
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Tallahassee to Reagan-National flights
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Melbourne to Reagan-National flights
Tallahassee to Dulles Intl flights
Panama City to Reagan-National flights
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Melbourne to Baltimore flights
Daytona Beach to Reagan-National flights
Key West to Dulles Intl flights
Tallahassee to Baltimore flights
Key West to Baltimore flights
Panama City to Baltimore flights
Daytona Beach to Baltimore flights
Valparaiso to Baltimore flights
Daytona Beach to Dulles Intl flights
Valparaiso to Reagan-National flights
Valparaiso to Dulles Intl flights
Gainesville to Dulles Intl flights
Gainesville to Reagan-National flights
Key West to Reagan-National flights
Gainesville to Baltimore flights
Valdosta to Dulles Intl flights
Valdosta to Baltimore flights

Top 4 airlines flying from Key Largo to Dulles Intl

Discover the top 4 airlines that operate flights from Key Largo 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 June 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$41Average$138FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$85Average$181FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$117Average$247FlexibilityNo cancel feeOn-time69%
DeltaCheapest$125Average$268FlexibilityNo cancel feeOn-timeN/A

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