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Key Largo

$54+ Cheap flights from Dulles Intl (IAD) to Key Largo, FL

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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — MIA
Dec 6 — Dec 131
Sat 12/6
Sat 12/13
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Key Largo are usually found in September or June, booked 25 days in advance, depart on a Monday or Sunday and return on a Friday

Cheap flight deals from Dulles Intl to Key Largo

Keep the following information in mind while searching for Dulles Intl to Key Largo flight deals. Data was last updated November 6, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$94
(Frontier)

One-way from

$54
(Kiwi.com)

Popular in

April

Cheapest in

September

Average price

$267
Provider with most accurate pricing for Washington, D.C. (WAS)-Miami flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Miami flights.
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From Washington, D.C. Dulles Intl to Key Largo
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One-way flight from Washington, D.C. Dulles Intl to Key Largo
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Highest demand for flights based on searches. 20% potential increase in price ($68 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in November 2025
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Find flight deals from Dulles Intl to Key Largo

Cheapest flights from Dulles Intl to Key Largo
Explore the most affordable flight options available from Dulles Intl to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2025.

This CheapOair deal was found by Cheapflights users on 11/4. 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 12/86:58 pmIAD - MIA
1 stop5h 48mFrontier
Sun 1/1110:27 amMIA - IAD
Nonstop2h 39mFrontier
Deal found 11/4$94
This Kiwi.com deal was found by Cheapflights users on 11/5. 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.
Mon 12/155:45 amIAD - MIA
1 stop5h 27mMultiple Airlines
Fri 12/1910:35 amMIA - IAD
Nonstop2h 39mMultiple Airlines
Deal found 11/5$96
This Frontier deal was found by Cheapflights users on 11/5. 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.
Thu 11/134:00 pmIAD - MIA
Nonstop2h 43mFrontier
Sun 11/237:15 amMIA - IAD
Nonstop2h 47mFrontier
Deal found 11/5$97
This CheapOair deal was found by Cheapflights users on 11/6. 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.
Sun 12/710:38 amIAD - MIA
1 stop26h 04mFrontier
Sun 12/148:30 amMIA - IAD
Nonstop2h 39mFrontier
Deal found 11/6$98
This CheapOair deal was found by Cheapflights users on 11/5. 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.
Thu 12/410:38 amIAD - MIA
1 stop27h 09mFrontier
Sun 12/78:30 amMIA - IAD
Nonstop2h 39mFrontier
Deal found 11/5$99
This Kiwi.com deal was found by Cheapflights users on 11/6. 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.
Mon 11/2412:47 pmIAD - MIA
Nonstop2h 43mFrontier
Thu 12/45:30 amMIA - IAD
1 stop12h 48mFrontier
Deal found 11/6$100
This Frontier deal was found by Cheapflights users on 11/5. 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.
Tue 12/29:00 amIAD - MIA
1 stop7h 28mFrontier
Fri 12/512:26 pmMIA - IAD
Nonstop2h 39mFrontier
Deal found 11/5$101
This CheapOair deal was found by Cheapflights users on 11/5. 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.
Sat 12/65:45 amIAD - MIA
1 stop9h 54mFrontier
Sun 12/78:30 amMIA - IAD
Nonstop2h 39mFrontier
Deal found 11/5$102
This CheapOair deal was found by Cheapflights users on 11/5. 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.
Thu 11/134:00 pmIAD - MIA
Nonstop2h 43mFrontier
Thu 11/206:21 pmMIA - IAD
1 stop5h 38mFrontier
Deal found 11/5$103
This CheapOair deal was found by Cheapflights users on 11/5. 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 12/112:47 pmIAD - MIA
Nonstop2h 43mFrontier
Mon 12/85:30 amMIA - IAD
1 stop11h 55mFrontier
Deal found 11/5$104
This CheapOair deal was found by Cheapflights users on 11/3. 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 12/112:47 pmIAD - MIA
Nonstop2h 43mFrontier
Mon 12/2210:35 amMIA - IAD
Nonstop2h 39mFrontier
Deal found 11/3$105
This CheapOair deal was found by Cheapflights users on 11/4. 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.
Sun 11/164:04 pmIAD - MIA
Nonstop2h 43mFrontier
Fri 11/2110:04 amMIA - IAD
1 stop7h 42mFrontier
Deal found 11/4$106

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Key Largo 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 November 6, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Key Largo that are best for you.

Fly from

Dulles Intl

Fly to

Key Largo

Route

Depart

Return

Price

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 12/5

4:00 pm-6:45 pm

Nonstop2h 45m

Miami

Sun 12/14

8:30 am-11:09 am

Nonstop2h 39m

$130

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Thu 12/4

7:18 pm-12:46 am

1 stop5h 28m

Miami

Mon 12/8

12:26 pm-3:05 pm

Nonstop2h 39m

$166

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sun 1/18

1:20 pm-4:22 pm

Nonstop3h 02m

Miami

Thu 1/22

1:45 pm-4:25 pm

Nonstop2h 40m

$207

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 11/10

4:00 pm-6:43 pm

Nonstop2h 43m

Miami

Thu 11/13

7:07 pm-12:11 am

1 stop5h 04m

$216

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 1/28

8:29 am-2:38 pm

1 stop6h 09m

Miami

Thu 2/5

1:45 pm-4:25 pm

Nonstop2h 40m

$242

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 11/19

5:33 pm-11:59 pm

1 stop6h 26m

Miami

Thu 11/20

10:55 am-4:25 pm

1 stop5h 30m

$244

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Thu 11/13

8:25 am-11:14 am

Nonstop2h 49m

Miami

Wed 11/19

12:51 pm-3:25 pm

Nonstop2h 34m

$252

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 1/16

5:46 pm-10:22 pm

1 stop4h 36m

Miami

Sat 1/24

4:03 pm-11:42 pm

1 stop7h 39m

$254

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sun 11/23

10:57 am-1:40 pm

Nonstop2h 43m

Miami

Sun 11/30

7:15 am-10:02 am

Nonstop2h 47m

$256

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Thu 12/4

8:26 am-11:14 am

Nonstop2h 48m

Miami

Wed 12/10

5:50 pm-11:21 pm

1 stop5h 31m

$258

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 22 results
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Best time to book a flight from Dulles Intl to Key Largo

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

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

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Key Largo. Price data was last updated on October 31, 2025.

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to Key Largo, you should look to book at least 25 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Key Largo (average of $64). Flying from Washington, D.C. Dulles Intl Airport to Key Largo in April is currently the most expensive (average of $177). 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 IAD to KE9?

Find hourly flight availability from Dulles Intl to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 6, 2025.

When flying from Washington, D.C. Dulles Intl Airport to Key Largo, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 21% versus a flight in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Key Largo. Price data was last updated on December 16, 2024.

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

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

Explore weekly flight availability from Dulles Intl to Key Largo. 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 November 6, 2025.

The most flights from IAD to KE9 are scheduled on a Monday (4 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. 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 Key Largo. Reviews last updated November 6, 2025.
Read reviews from past customers who have flown Delta, United Airlines, and American Airlines from Washington, D.C. Dulles Intl Airport to Key Largo. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,001 reviews

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Delta
7.9
Good
8,001 reviews
Delta
7.9
Good
8,001 reviews

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
United Airlines
7.4
Good
9,007 reviews
Delta
7.9
Good
8,001 reviews

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
American Airlines
7.2
Good
11,040 reviews
Delta
7.9
Good
8,001 reviews

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Spirit Airlines
6.3
Okay
8,122 reviews
Delta
7.9
Good
8,001 reviews

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.
Frontier
5.8
Fair
3,115 reviews
Delta
7.9
Good
8,001 reviews

Entertainment

7.9

Comfort

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Overall

7.9

Reviews

1 / 20
2.0
Mediocre

Joseph,Aug 2023

MSP - MCO

Even if you have delta comfort plus, they will move your overhead bag. One of the perks for upgrading is that you have dedicated space for your carry on with comfort plus with delta. They moved my carry on luggage (3) compartments back and put in bags for other passengers that should have gone under their respective seats. When deboarding the plane, there was no help from anyone to retrieve my luggage back several rows. Delta is turning into pure garbage.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Key Largo. 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 Washington, D.C. Dulles Intl Airport to Key Largo?

    For as low as $130, Frontier can have you in Key Largo from Washington, D.C. Dulles Intl Airport in 2h 45m. The distance from Washington, D.C. Dulles Intl Airport to Key Largo is about 923 mi. All flights are typically nonstop.

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

    Consider Copa Airlines (97%), United Airlines (97%) or Frontier (79%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. Dulles Intl Airport to Key Largo.

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

    The cheapest flight price from Washington, D.C. Dulles Intl Airport to Key Largo is $39. On average you can expect to pay $288. The most popular route, (Washington, D.C. Dulles Intl - Miami), can usually be booked for $58.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to Key Largo 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 Washington, D.C. Dulles Intl Airport to Key Largo?

    Currently, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Key Largo (average of $64). Flying from Washington, D.C. Dulles Intl Airport to Key Largo in April is currently the most expensive (average of $177). 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

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Alternative routes for Dulles Intl to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Dulles Intl to Key Largo

Discover the top 6 airlines that operate flights from Dulles Intl to Key Largo. 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 November 6, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$51Average$184FlexibilityNo cancel feeOn-time65%
FrontierCheapest$62Average$186FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$97Average$342FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$132Average$386FlexibilityNo cancel feeOn-time69%
DeltaCheapest$137Average$380FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$251Average$401FlexibilityNo cancel feeOn-time71%

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