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Key Largo

$49+ 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 2/9. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — MIA
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
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

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 February 3, 2026.

This Super.com deal was found by Cheapflights users on 2/1. 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 2/235:22 pm
IAD
-
MIA
1 stop7h 20m
Frontier
Fri 2/273:26 pm
MIA
-
IAD
Nonstop2h 41m
Frontier
Deal found 2/1$102
This Kiwi.com deal was found by Cheapflights users on 1/31. 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 4/13:15 pm
IAD
-
MIA
1 stop9h 34m
Frontier
Thu 4/96:33 pm
MIA
-
IAD
Nonstop2h 45m
Frontier
Deal found 1/31$103
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 4/46:31 pm
IAD
-
MIA
Nonstop2h 52m
Frontier
Tue 4/1412:26 pm
MIA
-
IAD
1 stop12h 10m
Frontier
Deal found 2/1$104
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 4/910:13 pm
IAD
-
MIA
Nonstop2h 52m
Multiple Airlines
Tue 4/143:12 pm
MIA
-
IAD
1 stop9h 24m
Multiple Airlines
Deal found 2/1$106
This Frontier deal was found by Cheapflights users on 1/31. 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 2/195:37 pm
IAD
-
MIA
1 stop7h 05m
Frontier
Fri 2/273:26 pm
MIA
-
IAD
Nonstop2h 41m
Frontier
Deal found 1/31$108
This Frontier deal was found by Cheapflights users on 2/1. 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 4/73:15 pm
IAD
-
MIA
1 stop9h 34m
Frontier
Thu 4/96:33 pm
MIA
-
IAD
Nonstop2h 45m
Frontier
Deal found 2/1$112
This Frontier deal was found by Cheapflights users on 2/1. 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 4/910:13 pm
IAD
-
MIA
Nonstop2h 52m
Frontier
Tue 4/147:04 pm
MIA
-
IAD
1 stop5h 32m
Frontier
Deal found 2/1$113
This Kiwi.com deal was found by Cheapflights users on 2/1. 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 4/46:31 pm
IAD
-
MIA
Nonstop2h 52m
Multiple Airlines
Thu 4/93:12 pm
MIA
-
IAD
1 stop9h 24m
Multiple Airlines
Deal found 2/1$114
This United Airlines deal was found by Cheapflights users on 2/2. 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.
Sat 4/251:20 pm
IAD
-
MIA
Nonstop2h 56m
United Airlines
Tue 4/286:00 pm
MIA
-
IAD
Nonstop2h 49m
United Airlines
Deal found 2/2$115
This Trip.com deal was found by Cheapflights users on 2/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/96:20 am
IAD
-
MIA
1 stop11h 33m
Frontier
Wed 3/183:16 pm
MIA
-
IAD
1 stop9h 05m
Frontier
Deal found 2/2$123
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 2/2110:29 am
IAD
-
MIA
1 stop14h 13m
Frontier
Fri 2/273:26 pm
MIA
-
IAD
Nonstop2h 41m
Frontier
Deal found 2/2$124
This Mytrip deal was found by Cheapflights users on 2/1. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/27:05 pm
IAD
-
MIA
Nonstop2h 52m
Frontier
Thu 3/55:05 am
MIA
-
IAD
1 stop5h 28m
Frontier
Deal found 2/1$126

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 February 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$102
(Super.com)

One-way from

$49
(Super.com)

Popular in

April

Cheapest in

September

Average price

$270
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 ($78 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 February 2026
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 February 3, 2026.
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

Tue 3/17

1:10 pm-4:11 pm

Nonstop3h 01m

Miami

Thu 3/26

6:34 pm-9:24 pm

Nonstop2h 50m

$207

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 3/4

8:15 am-11:16 am

Nonstop3h 01m

Miami

Wed 3/11

6:34 pm-9:24 pm

Nonstop2h 50m

$207

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Tue 4/7

5:41 pm-11:22 pm

1 stop5h 41m

Miami

Tue 4/14

6:00 pm-8:49 pm

Nonstop2h 49m

$211

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Tue 3/3

6:00 am-1:37 pm

1 stop7h 37m

Miami

Tue 3/10

1:30 pm-4:08 pm

Nonstop2h 38m

$254

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 2/21

6:00 am-12:32 pm

1 stop6h 32m

Miami

Wed 2/25

1:38 pm-4:17 pm

Nonstop2h 39m

$263

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 3/13

1:10 pm-4:11 pm

Nonstop3h 01m

Miami

Wed 3/18

6:34 pm-9:24 pm

Nonstop2h 50m

$267

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 3/7

1:10 pm-4:11 pm

Nonstop3h 01m

Miami

Wed 3/11

6:34 pm-9:24 pm

Nonstop2h 50m

$271

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 2/21

8:15 am-11:16 am

Nonstop3h 01m

Miami

Thu 2/26

6:35 pm-9:25 pm

Nonstop2h 50m

$272

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Thu 2/19

6:00 am-1:37 pm

1 stop7h 37m

Miami

Wed 2/25

6:35 pm-9:25 pm

Nonstop2h 50m

$275

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 2/21

1:20 pm-4:21 pm

Nonstop3h 01m

Miami

Fri 2/27

6:35 pm-9:25 pm

Nonstop2h 50m

$291

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/2

Showing 1-10 of 23 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 January 30, 2026.

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, 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 $164). 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 February 3, 2026.

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 evening, which can drop the price by up to 42% 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 January 31, 2026.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Key Largo flight should consider departing on Monday afternoons 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 February 3, 2026.

The most flights from IAD to KE9 are scheduled on a Monday (5 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 on average).

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

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 February 3, 2026.
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
8,138 reviews

Food

7.2

Comfort

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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
8,138 reviews
Delta
7.9
Good
8,138 reviews

Food

7.2

Comfort

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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
9,236 reviews
Delta
7.9
Good
8,138 reviews

Food

7.2

Comfort

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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
11,218 reviews
Delta
7.9
Good
8,138 reviews

Food

7.2

Comfort

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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.
JetBlue
7.2
Good
2,893 reviews
Delta
7.9
Good
8,138 reviews

Food

7.2

Comfort

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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
5.7
Fair
3,051 reviews
Delta
7.9
Good
8,138 reviews

Food

7.2

Comfort

7.9

Entertainment

7.8

Crew

8.5

Boarding

8.1

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 $207, United Airlines can have you in Key Largo from Washington, D.C. Dulles Intl Airport in 3h 01m. 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 $29 on Frontier. Other airlines that offer cheap prices include JetBlue from $58 and United Airlines from $76 one-way.

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

    Consider Volaris (89%), Copa Airlines (79%) or United Airlines (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 $29. On average you can expect to pay $498. The most popular route, (Washington, D.C. Dulles Intl - Miami), can usually be booked for $91.

  • 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 $164). 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 February 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$37Average$137FlexibilityNo cancel feeOn-time65%
FrontierCheapest$47Average$181FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$83Average$277FlexibilityNo cancel feeOn-time62%
DeltaCheapest$89Average$372FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$119Average$357FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$251Average$421FlexibilityNo cancel feeOn-time71%

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