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Key Largo

$53+ 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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — MIA
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 June or July, booked 26 days in advance, depart on a Thursday or Saturday 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 September 17, 2025.

Round-trip from

$97
(Cheapflightsfares)

One-way from

$53
(Priceline)

Popular in

April

Cheapest in

June

Average price

$185
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. 16% potential increase in price ($53 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 September 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 September 17, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/103:51 pmIAD - MIA
Nonstop2h 47mFrontier
Tue 11/113:06 pmMIA - IAD
1 stop5h 14mFrontier
Deal found 9/16$97
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/223:15 pmIAD - MIA
Nonstop2h 49mFrontier
Mon 9/2911:35 amMIA - IAD
Nonstop2h 50mFrontier
Deal found 9/14$101
This Priceline deal was found by Cheapflights users on 9/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/133:10 pmIAD - MIA
Nonstop2h 47mFrontier
Fri 10/1711:34 amMIA - IAD
Nonstop2h 51mFrontier
Deal found 9/16$102
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/33:15 pmIAD - MIA
Nonstop2h 49mFrontier
Fri 10/1011:34 amMIA - IAD
Nonstop2h 51mFrontier
Deal found 9/15$103
This CheapOair deal was found by Cheapflights users on 9/15. 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.
Thu 11/133:51 pmIAD - MIA
Nonstop2h 47mFrontier
Mon 11/1712:22 pmMIA - IAD
Nonstop2h 34mFrontier
Deal found 9/15$104
This Cheapflightsfares deal was found by Cheapflights users on 9/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/243:10 pmIAD - MIA
Nonstop2h 47mFrontier
Mon 10/2711:34 amMIA - IAD
Nonstop2h 51mFrontier
Deal found 9/15$105
This Frontier deal was found by Cheapflights users on 9/15. 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.
Mon 10/203:10 pmIAD - MIA
Nonstop2h 47mFrontier
Fri 10/2411:34 amMIA - IAD
Nonstop2h 51mFrontier
Deal found 9/15$106
This Kiwi.com deal was found by Cheapflights users on 9/17. 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.
Sun 11/94:00 pmIAD - MIA
Nonstop2h 43mFrontier
Mon 11/1712:22 pmMIA - IAD
Nonstop2h 47mFrontier
Deal found 9/17$111
This Frontier deal was found by Cheapflights users on 9/15. 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 10/114:22 pmIAD - MIA
1 stop7h 01mFrontier
Sun 10/1211:34 amMIA - IAD
Nonstop2h 51mFrontier
Deal found 9/15$113
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Sun 10/263:10 pmIAD - MIA
Nonstop2h 47mFrontier
Mon 10/2711:34 amMIA - IAD
Nonstop2h 51mFrontier
Deal found 9/14$114

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 September 17, 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

Sat 10/4

8:25 am-11:16 am

Nonstop2h 51m

Miami

Tue 10/7

1:15 pm-3:50 pm

Nonstop2h 35m

$117

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 10/20

6:15 am-12:18 pm

1 stop6h 03m

Miami

Tue 10/21

1:15 pm-3:50 pm

Nonstop2h 35m

$152

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Tue 10/28

8:25 am-11:14 am

Nonstop2h 49m

Miami

Tue 10/28

4:50 pm-10:58 pm

1 stop6h 08m

$152

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 9/27

8:30 am-2:42 pm

1 stop6h 12m

Miami

Sat 10/4

1:15 pm-3:50 pm

Nonstop2h 35m

$162

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 10/8

8:25 am-11:16 am

Nonstop2h 51m

Miami

Wed 10/15

1:15 pm-3:50 pm

Nonstop2h 35m

$187

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 10/27

8:25 am-11:14 am

Nonstop2h 49m

Miami

Wed 10/29

12:51 pm-3:25 pm

Nonstop2h 34m

$187

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Thu 10/2

8:25 am-11:16 am

Nonstop2h 51m

Miami

Tue 10/7

1:15 pm-3:50 pm

Nonstop2h 35m

$187

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 10/4

8:25 am-11:16 am

Nonstop2h 51m

Miami

Thu 10/9

1:15 pm-3:50 pm

Nonstop2h 35m

$187

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 11/1

8:45 am-2:37 pm

1 stop5h 52m

Miami

Sun 11/9

12:51 pm-3:25 pm

Nonstop2h 34m

$193

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 9/29

8:25 am-11:16 am

Nonstop2h 51m

Miami

Wed 10/8

1:15 pm-3:50 pm

Nonstop2h 35m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 20 results
1
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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 September 12, 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 26 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, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Key Largo (average of $232). Flying from Washington, D.C. Dulles Intl Airport to Key Largo in March is currently the most expensive (average of $289). 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 September 17, 2025.

When flying from Washington, D.C. Dulles Intl Airport to Key Largo, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 Friday at noon when fares are most often at their lowest. Friday 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 September 17, 2025.

The most flights from IAD to KE9 are scheduled on a Monday (3 on average). You will have fewer flight options on Tuesday, 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 September 17, 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
8.0
Very good
7,961 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

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
8.0
Very good
7,961 reviews
Delta
8.0
Very good
7,961 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

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
8,926 reviews
Delta
8.0
Very good
7,961 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

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
10,000 reviews
Delta
8.0
Very good
7,961 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

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
8,023 reviews
Delta
8.0
Very good
7,961 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

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
3,173 reviews
Delta
8.0
Very good
7,961 reviews

Crew

8.5

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Food

7.3

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 $117, United Airlines can have you in Key Largo from Washington, D.C. Dulles Intl Airport in 2h 51m. 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 (93%), United Airlines (93%) or Frontier (43%) 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 $490. The most popular route, (Washington, D.C. Dulles Intl - Miami), can usually be booked for $101.

  • 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, September is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Key Largo (average of $232). Flying from Washington, D.C. Dulles Intl Airport to Key Largo in March is currently the most expensive (average of $289). 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$180FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$73Average$185FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$83Average$344FlexibilityNo cancel feeOn-time62%
DeltaCheapest$139Average$383FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$158Average$395FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$252Average$402FlexibilityNo cancel feeOn-time71%

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