HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$53+ 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 3/16. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — IAD
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Key Largo to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Key Largo to Washington, D.C. Dulles Intl are usually found in November or September, booked 65 days in advance, depart on a Friday or Thursday and return on a Sunday

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 December 18, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/16. 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.
Fri 12/2610:35 amMIA - IAD
Nonstop2h 39mFrontier
Sat 1/102:06 pmIAD - MIA
Nonstop2h 53mFrontier
Deal found 12/16$106
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/235:30 amMIA - IAD
1 stop11h 07mFrontier
Mon 1/52:09 pmIAD - MIA
Nonstop2h 45mFrontier
Deal found 12/16$111
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2210:35 amMIA - IAD
Nonstop2h 39mFrontier
Mon 1/52:09 pmIAD - MIA
Nonstop2h 45mFrontier
Deal found 12/16$121
This Frontier deal was found by Cheapflights users on 12/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2210:35 amMIA - IAD
Nonstop2h 39mFrontier
Fri 1/22:09 pmIAD - MIA
Nonstop2h 45mFrontier
Deal found 12/14$127
This Expedia deal was found by Cheapflights users on 12/15. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/235:30 amMIA - IAD
1 stop11h 07mFrontier
Sat 1/311:04 amIAD - MIA
Nonstop2h 45mFrontier
Deal found 12/15$130
This CheapOair deal was found by Cheapflights users on 12/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1910:35 amMIA - IAD
Nonstop2h 39mFrontier
Sat 1/172:58 pmIAD - MIA
Nonstop2h 52mFrontier
Deal found 12/15$132
This Kiwi.com deal was found by Cheapflights users on 12/14. 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.
Fri 12/2610:35 amMIA - IAD
Nonstop2h 39mFrontier
Fri 1/22:09 pmIAD - MIA
Nonstop2h 45mFrontier
Deal found 12/14$135
This Priceline deal was found by Cheapflights users on 12/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/277:30 amMIA - IAD
Nonstop2h 39mFrontier
Thu 1/81:46 pmIAD - MIA
Nonstop2h 53mFrontier
Deal found 12/15$137
This Frontier deal was found by Cheapflights users on 12/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/207:30 amMIA - IAD
Nonstop2h 39mFrontier
Sat 1/311:04 amIAD - MIA
Nonstop2h 45mFrontier
Deal found 12/15$140
This Kiwi.com deal was found by Cheapflights users on 12/16. 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.
Fri 12/2610:35 amMIA - IAD
Nonstop2h 39mMultiple Airlines
Wed 1/76:00 amIAD - MIA
1 stop7h 06mMultiple Airlines
Deal found 12/16$145

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 December 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$73
(eDestinos)

One-way from

$53
(Super.com)

Popular in

March

Cheapest in

November

Average price

$238
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. 21% potential increase in price ($52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 18, 2025.
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

Key Largo

Fly to

Dulles Intl

Route

Depart

Return

Price

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Thu 1/8

5:20 am-11:28 am

1 stop6h 08m

Washington, D.C. Dulles Intl

Sun 1/11

1:46 pm-4:39 pm

Nonstop2h 53m

$97

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Sat 1/31

6:25 pm-9:11 pm

Nonstop2h 46m

Washington, D.C. Dulles Intl

Tue 2/3

8:15 am-11:16 am

Nonstop3h 01m

$127

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Mon 2/2

5:30 am-4:28 pm

1 stop10h 58m

Washington, D.C. Dulles Intl

Mon 3/2

7:05 pm-9:57 pm

Nonstop2h 52m

$132

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Sat 1/31

6:25 pm-9:11 pm

Nonstop2h 46m

Washington, D.C. Dulles Intl

Sun 2/8

1:20 pm-4:22 pm

Nonstop3h 02m

$134

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Fri 1/30

7:25 pm-12:24 am

1 stop4h 59m

Washington, D.C. Dulles Intl

Tue 2/3

7:15 am-12:14 pm

1 stop4h 59m

$151

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Thu 1/8

5:50 am-10:55 am

1 stop5h 05m

Washington, D.C. Dulles Intl

Sun 1/11

6:20 am-12:14 pm

1 stop5h 54m

$151

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Fri 2/6

8:05 am-4:46 pm

1 stop8h 41m

Washington, D.C. Dulles Intl

Sun 2/8

6:00 am-10:40 am

1 stop4h 40m

$151

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Wed 1/7

5:50 am-10:53 am

1 stop5h 03m

Washington, D.C. Dulles Intl

Sun 1/11

6:20 am-12:14 pm

1 stop5h 54m

$151

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Fri 1/23

1:21 pm-6:21 pm

1 stop5h 00m

Washington, D.C. Dulles Intl

Mon 1/26

7:15 am-12:23 pm

1 stop5h 08m

$151

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Thu 1/29

7:15 am-11:44 am

1 stop4h 29m

Washington, D.C. Dulles Intl

Sat 1/31

5:59 pm-12:51 am

1 stop6h 52m

$159

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 21 results
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

How far ahead should I book a flight from Key Largo to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Dulles Intl. Price data was last updated on December 12, 2025.

Booking 65 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to Washington, D.C. Dulles Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Key Largo to Washington, D.C. Dulles Intl Airport?

Currently, December is the cheapest month in which you can book a flight from Key Largo to Washington, D.C. Dulles Intl Airport (average of $29). Flying from Key Largo to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $142). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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 December 18, 2025.

It’s optimal to fly from Key Largo to Washington, D.C. Dulles Intl Airport in the evening. By choosing this option you can save up to 60% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from Key Largo to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Dulles Intl. Price data was last updated on February 16, 2025.

Travelers seeking maximum savings on their Key Largo to Washington, D.C. Dulles Intl Airport flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Key Largo to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Key Largo to Dulles Intl. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated December 18, 2025.

The most flights from KE9 to IAD are scheduled on a Thursday (3 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (1 on average).

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 December 18, 2025.
Read through reviews of airlines operating flights from Key Largo to Washington, D.C. Dulles Intl Airport, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,005 reviews

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
7.9
Good
8,005 reviews
Delta
7.9
Good
8,005 reviews

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
United Airlines
7.4
Good
9,092 reviews
Delta
7.9
Good
8,005 reviews

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
American Airlines
7.2
Good
11,055 reviews
Delta
7.9
Good
8,005 reviews

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Frontier
5.8
Fair
3,081 reviews
Delta
7.9
Good
8,005 reviews

Food

7.3

Entertainment

7.9

Comfort

7.9

Crew

8.5

Overall

7.9

Boarding

8.1

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

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 46m. 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 $34. Spirit Airlines flights start at $46 while deals on JetBlue start at $63 one-way.

  • What are the most reliable airlines from Key Largo to Washington, D.C. Dulles Intl Airport?

    No one likes to see their flight delayed. When booking a flight from Key Largo to Washington, D.C. Dulles Intl Airport consider choosing Volaris (100%), Frontier (87%) or United Airlines (77%) as they are the most reliable in getting you off to your destination on time.

  • 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 $192, our data shows the cheapest flight currently is $29. When looking at the most popular route, (Miami - Washington, D.C. Dulles Intl), you can expect to pay $59 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.

  • What is the cheapest month to book a flight from Key Largo to Washington, D.C. Dulles Intl Airport?

    Currently, December is the cheapest month in which you can book a flight from Key Largo to Washington, D.C. Dulles Intl Airport (average of $29). Flying from Key Largo to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $142). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
National Harbor
Bowie
Largo
McLean
Clinton
Cordova

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Key Largo to Dulles Intl

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

Top 6 airlines flying from Key Largo to Dulles Intl

Discover the top 6 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$37Average$148FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$64Average$115FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$85Average$149FlexibilityNo cancel feeOn-time62%
DeltaCheapest$103Average$232FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$124Average$258FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$250Average$309FlexibilityNo cancel feeOn-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.