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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 2/27. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — MIA
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
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 34 days in advance, depart on a Sunday or Monday and return on a Friday

Cheap 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 December 23, 2025.

This Frontier deal was found by Cheapflights users on 12/22. 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.
Wed 12/317:01 pmIAD - MIA
1 stop5h 46mFrontier
Fri 1/1610:19 amMIA - IAD
Nonstop2h 44mFrontier
Deal found 12/22$110
This Frontier deal was found by Cheapflights users on 12/20. 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 12/292:09 pmIAD - MIA
Nonstop2h 45mFrontier
Thu 1/810:22 amMIA - IAD
Nonstop2h 39mFrontier
Deal found 12/20$118
This Frontier deal was found by Cheapflights users on 12/22. 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.
Wed 12/317:01 pmIAD - MIA
1 stop5h 46mFrontier
Thu 1/810:22 amMIA - IAD
Nonstop2h 39mFrontier
Deal found 12/22$121
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/317:01 pmIAD - MIA
1 stop5h 46mMultiple Airlines
Thu 1/157:00 amMIA - IAD
1 stop9h 52mMultiple Airlines
Deal found 12/20$153
This Kiwi.com deal was found by Cheapflights users on 12/22. 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 12/317:01 pmIAD - MIA
1 stop5h 46mFrontier
Sat 1/175:15 amMIA - IAD
1 stop5h 52mFrontier
Deal found 12/22$156
This Kiwi.com deal was found by Cheapflights users on 12/20. 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 12/317:01 pmIAD - MIA
1 stop5h 46mFrontier
Thu 1/155:15 amMIA - IAD
1 stop6h 28mFrontier
Deal found 12/20$157
This Super.com deal was found by Cheapflights users on 12/22. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/292:09 pmIAD - MIA
Nonstop2h 45mFrontier
Mon 1/2612:19 pmMIA - IAD
Nonstop2h 44mFrontier
Deal found 12/22$161
This United Airlines deal was found by Cheapflights users on 12/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/315:10 pmIAD - MIA
Nonstop3h 01mUnited Airlines
Thu 1/156:25 pmMIA - IAD
Nonstop2h 46mUnited Airlines
Deal found 12/20$167
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 12/288:26 pmIAD - MIA
1 stop9h 34mFrontier
Thu 1/810:22 amMIA - IAD
Nonstop2h 39mFrontier
Deal found 12/21$169
This Frontier deal was found by Cheapflights users on 12/22. 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 12/305:37 pmIAD - MIA
1 stop7h 10mFrontier
Sat 1/1711:19 amMIA - IAD
Nonstop2h 44mFrontier
Deal found 12/22$180

Find 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 December 23, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$79
(Frontier)

One-way from

$53
(Super.com)

Popular in

April

Cheapest in

September

Average price

$243
Provider with most accurate pricing for Washington, D.C. (WAS)-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Miami flights.
Search Deals
From Washington, D.C. Dulles Intl to Key Largo
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Key Largo
Search Deals
Highest demand for flights based on searches. 25% potential increase in price ($79 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($15 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 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 December 23, 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

Wed 1/21

1:20 pm-4:22 pm

Nonstop3h 02m

Miami

Wed 1/28

5:40 pm-11:18 pm

1 stop5h 38m

$159

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 1/14

1:20 pm-4:22 pm

Nonstop3h 02m

Miami

Wed 1/21

5:40 pm-11:18 pm

1 stop5h 38m

$179

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 1/26

1:20 pm-4:22 pm

Nonstop3h 02m

Miami

Tue 1/27

1:45 pm-4:25 pm

Nonstop2h 40m

$181

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 1/24

1:20 pm-4:22 pm

Nonstop3h 02m

Miami

Wed 1/28

6:25 pm-9:11 pm

Nonstop2h 46m

$188

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 1/24

8:29 am-4:34 pm

1 stop8h 05m

Miami

Tue 1/27

4:54 pm-11:18 pm

1 stop6h 24m

$191

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Thu 1/22

1:20 pm-4:22 pm

Nonstop3h 02m

Miami

Wed 1/28

6:25 pm-9:11 pm

Nonstop2h 46m

$197

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 1/21

8:29 am-4:34 pm

1 stop8h 05m

Miami

Fri 1/23

5:40 pm-11:18 pm

1 stop5h 38m

$201

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 1/21

6:00 am-12:38 pm

1 stop6h 38m

Miami

Mon 1/26

6:25 pm-9:11 pm

Nonstop2h 46m

$210

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Tue 1/20

1:20 pm-4:22 pm

Nonstop3h 02m

Miami

Sat 1/24

6:25 pm-9:11 pm

Nonstop2h 46m

$219

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 1/5

8:45 am-11:47 am

Nonstop3h 02m

Miami

Tue 1/13

6:25 pm-9:11 pm

Nonstop2h 46m

$222

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

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 December 19, 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 34 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, December is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Key Largo (average of $47). 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 December 23, 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 at noon, which can drop the price by up to 11% versus a flight in the morning.

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 Tuesday 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 December 23, 2025.

The most flights from IAD to KE9 are scheduled on a Monday (6 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (3 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 December 23, 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
8,014 reviews

Entertainment

7.9

Boarding

8.1

Food

7.3

Comfort

7.9

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
8,014 reviews
Delta
7.9
Good
8,014 reviews

Entertainment

7.9

Boarding

8.1

Food

7.3

Comfort

7.9

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
9,105 reviews
Delta
7.9
Good
8,014 reviews

Entertainment

7.9

Boarding

8.1

Food

7.3

Comfort

7.9

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
11,054 reviews
Delta
7.9
Good
8,014 reviews

Entertainment

7.9

Boarding

8.1

Food

7.3

Comfort

7.9

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
8,196 reviews
Delta
7.9
Good
8,014 reviews

Entertainment

7.9

Boarding

8.1

Food

7.3

Comfort

7.9

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
3,075 reviews
Delta
7.9
Good
8,014 reviews

Entertainment

7.9

Boarding

8.1

Food

7.3

Comfort

7.9

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 $159, United Airlines can have you in Key Largo from Washington, D.C. Dulles Intl Airport in 3h 02m. The distance from Washington, D.C. Dulles Intl Airport to Key Largo is about 923 mi. All flights are typically nonstop.

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

    One-way options have recently been found by users for as low as $31 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $37 and United Airlines from $83 one-way.

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

    Consider Volaris (100%), United Airlines (88%) or Copa Airlines (80%) 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 $29. On average you can expect to pay $162. The most popular route, (Washington, D.C. Dulles Intl - Miami), can usually be booked for $59.

  • 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, December is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Key Largo (average of $47). 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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$51Average$164FlexibilityNo cancel feeOn-time65%
FrontierCheapest$54Average$185FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$97Average$280FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$127Average$376FlexibilityNo cancel feeOn-time69%
DeltaCheapest$131Average$384FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$251Average$397FlexibilityNo cancel feeOn-time71%

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