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Key Largo

$56+ 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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — MIA
Apr 27 — May 41
Mon 4/27
Mon 5/4
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 October, 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 March 28, 2026.

This Kiwi.com deal was found by Cheapflights users on 3/24. 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 4/296:20 am
IAD
-
MIA
1 stop5h 43m
Frontier
Tue 5/128:10 am
MIA
-
IAD
1 stop8h 11m
Frontier
Deal found 3/24$148
This Super.com deal was found by Cheapflights users on 3/24. 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.
Thu 4/210:13 pm
IAD
-
MIA
Nonstop2h 52m
Frontier
Wed 4/297:04 pm
MIA
-
IAD
1 stop5h 32m
Frontier
Deal found 3/24$152
This Kiwi.com deal was found by Cheapflights users on 3/28. 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 4/2510:51 am
IAD
-
MIA
1 stop5h 13m
Multiple Airlines
Tue 4/287:04 pm
MIA
-
IAD
1 stop5h 32m
Multiple Airlines
Deal found 3/28$153
This Kiwi.com deal was found by Cheapflights users on 3/27. 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 4/1810:51 am
IAD
-
MIA
1 stop5h 13m
Multiple Airlines
Tue 4/217:04 pm
MIA
-
IAD
1 stop5h 32m
Multiple Airlines
Deal found 3/27$154
This Frontier deal was found by Cheapflights users on 3/25. 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.
Fri 4/102:47 pm
IAD
-
MIA
Nonstop2h 52m
Frontier
Mon 4/137:12 pm
MIA
-
IAD
1 stop5h 24m
Frontier
Deal found 3/25$155
This Kiwi.com deal was found by Cheapflights users on 3/24. 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 4/257:05 am
IAD
-
MIA
1 stop7h 05m
Multiple Airlines
Sat 5/24:59 pm
MIA
-
IAD
1 stop7h 37m
Multiple Airlines
Deal found 3/24$156
This Kiwi.com deal was found by Cheapflights users on 3/26. 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.
Tue 5/267:45 am
IAD
-
MIA
1 stop5h 35m
Frontier
Tue 6/28:10 am
MIA
-
IAD
1 stop8h 11m
Frontier
Deal found 3/26$157
This Kiwi.com deal was found by Cheapflights users on 3/25. 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 4/249:21 am
IAD
-
MIA
1 stop8h 36m
Frontier
Tue 4/281:05 pm
MIA
-
IAD
1 stop11h 31m
Frontier
Deal found 3/25$158
This Expedia deal was found by Cheapflights users on 3/25. 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.
Mon 4/610:25 pm
IAD
-
MIA
1 stop11h 57m
Frontier
Fri 4/1011:17 am
MIA
-
IAD
Nonstop2h 45m
Frontier
Deal found 3/25$159
This Frontier deal was found by Cheapflights users on 3/27. 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 4/115:35 am
IAD
-
MIA
1 stop8h 33m
Frontier
Fri 4/1712:26 pm
MIA
-
IAD
1 stop12h 10m
Frontier
Deal found 3/27$160
This Kiwi.com deal was found by Cheapflights users on 3/25. 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 4/257:05 am
IAD
-
MIA
1 stop7h 05m
Frontier
Fri 5/88:10 am
MIA
-
IAD
1 stop9h 02m
Frontier
Deal found 3/25$161
This Super.com deal was found by Cheapflights users on 3/27. 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.
Sat 4/46:31 pm
IAD
-
MIA
Nonstop2h 52m
Frontier
Thu 4/96:33 pm
MIA
-
IAD
Nonstop2h 45m
Frontier
Deal found 3/27$162

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 March 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Frontier)

One-way from

$56
(Super.com)

Popular in

March

Cheapest in

September

Average price

$347
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. 26% potential increase in price ($81 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 28, 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 5/2

3:00 pm-8:48 pm

1 stop5h 48m

Miami

Sat 5/9

7:39 pm-12:51 am

1 stop5h 12m

$197

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Tue 5/26

8:45 am-11:35 am

Nonstop2h 50m

Miami

Tue 6/2

5:22 pm-11:19 pm

1 stop5h 57m

$254
Quickest round-trip

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Thu 6/11

8:45 am-11:35 am

Nonstop2h 50m

Miami

Mon 6/15

1:10 pm-3:53 pm

Nonstop2h 43m

$257

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 4/20

1:20 pm-4:16 pm

Nonstop2h 56m

Miami

Sat 4/25

6:00 pm-8:49 pm

Nonstop2h 49m

$257

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 5/11

1:20 pm-4:16 pm

Nonstop2h 56m

Miami

Sat 5/16

4:50 pm-11:25 pm

1 stop6h 35m

$258

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 6/17

8:45 am-11:35 am

Nonstop2h 50m

Miami

Sat 6/20

1:10 pm-3:53 pm

Nonstop2h 43m

$353

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 5/11

1:20 pm-4:16 pm

Nonstop2h 56m

Miami

Fri 5/15

6:10 pm-9:00 pm

Nonstop2h 50m

$377

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 6/24

8:45 am-11:35 am

Nonstop2h 50m

Miami

Tue 6/30

1:10 pm-3:53 pm

Nonstop2h 43m

$382

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 5/16

1:20 pm-4:16 pm

Nonstop2h 56m

Miami

Sun 5/24

8:48 am-6:50 pm

1 stop10h 02m

$407

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 5/30

8:15 am-4:14 pm

1 stop7h 59m

Miami

Sun 6/7

1:10 pm-3:53 pm

Nonstop2h 43m

$427

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/23

Showing 1-10 of 23 resultsSorted by cheapest first
1
2
3

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 March 13, 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 $116). 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 March 28, 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 43% 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 March 28, 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.

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 March 28, 2026.
Read reviews from past customers who have flown Delta,United Airlines, andJetBlue 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
8,357 reviews

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

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
8,357 reviews
Delta
7.9
Good
8,357 reviews

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

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
9,501 reviews
Delta
7.9
Good
8,357 reviews

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

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
2,909 reviews
Delta
7.9
Good
8,357 reviews

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

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
7.1
Good
11,520 reviews
Delta
7.9
Good
8,357 reviews

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

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
3,013 reviews
Delta
7.9
Good
8,357 reviews

Boarding

8.1

Food

7.2

Comfort

7.9

Crew

8.5

Entertainment

7.8

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 $254, Delta can have you in Key Largo from Washington, D.C. Dulles Intl Airport in 2h 50m. The distance from Washington, D.C. Dulles Intl Airport to Key Largo is about 923 mi. This flight may include one or multiple stops.

  • 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 $85 one-way.

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

    Consider Volaris (100%), United Airlines (81%) 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 $33. On average you can expect to pay $539. The most popular route, (Washington, D.C. Dulles Intl - Miami), can usually be booked for $122.

  • 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 $116). 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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Baltimore to West Palm Beach flights
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Baltimore to Fort Myers flights
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Baltimore to Sarasota flights
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Reagan-National to Pensacola flights
Dulles Intl to Pensacola flights
Reagan-National to Sarasota flights
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Dulles Intl to Panama City flights
Baltimore to Key West flights
Reagan-National to Panama City flights
Baltimore to Pensacola flights
Baltimore to Panama City flights
Dulles Intl to Valparaiso flights
Reagan-National to Valparaiso flights
Baltimore to Daytona Beach flights
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Dulles Intl to Daytona Beach flights
Baltimore to Melbourne flights
Reagan-National to Daytona Beach flights
Reagan-National to Melbourne flights
Dulles Intl to Melbourne flights
Dulles Intl to Orlando Sanford Intl flights
Reagan-National to Tallahassee flights
Dulles Intl to Tallahassee flights
Baltimore to Gainesville flights
Baltimore to Tallahassee flights
Dulles Intl to Gainesville flights
Reagan-National to Gainesville flights
Reagan-National to Valdosta flights

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 March 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$37Average$178FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$37Average$197FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$83Average$268FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$367FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$119Average$357FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$251Average$397FlexibilityNo cancel feeOn-time71%

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