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Key Largo

$82+ 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 7/22. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — MIA
Jul 28 — Aug 41
Tue 7/28
Tue 8/4
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 34 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 June 28, 2026.

This deal was found by Cheapflights users on 6/25. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/137:00 am
IAD
-
MIA
1 stop5h 05m
Frontier
Mon 11/167:17 pm
MIA
-
IAD
1 stop5h 11m
Frontier
Deal found 6/25$136
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 8/266:20 am
IAD
-
MIA
1 stop7h 12m
Frontier
Tue 9/111:10 am
MIA
-
IAD
1 stop6h 04m
Frontier
Deal found 6/24$167
This Trip.com deal was found by Cheapflights users on 6/28. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/127:48 am
IAD
-
MIA
1 stop15h 18m
Frontier
Wed 8/198:10 am
MIA
-
IAD
1 stop14h 42m
Frontier
Deal found 6/28$168
This Kiwi.com deal was found by Cheapflights users on 6/24. 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 7/256:49 am
IAD
-
MIA
1 stop7h 04m
Frontier
Sat 8/13:07 pm
MIA
-
IAD
1 stop7h 48m
Frontier
Deal found 6/24$170
This Kiwi.com deal was found by Cheapflights users on 6/27. 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 8/16:49 am
IAD
-
MIA
1 stop7h 04m
Frontier
Sat 8/83:07 pm
MIA
-
IAD
1 stop7h 45m
Frontier
Deal found 6/27$171
This Kiwi.com deal was found by Cheapflights users on 6/27. 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 8/86:49 am
IAD
-
MIA
1 stop7h 04m
Frontier
Sat 8/158:30 am
MIA
-
IAD
1 stop8h 04m
Frontier
Deal found 6/27$172
This Kiwi.com deal was found by Cheapflights users on 6/25. 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.
Tue 7/217:49 am
IAD
-
MIA
1 stop6h 04m
Frontier
Sat 7/258:30 am
MIA
-
IAD
1 stop8h 04m
Frontier
Deal found 6/25$174
This Kiwi.com deal was found by Cheapflights users on 6/27. 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 7/256:49 am
IAD
-
MIA
1 stop7h 04m
Frontier
Wed 7/298:30 am
MIA
-
IAD
1 stop8h 44m
Frontier
Deal found 6/27$175
This Kiwi.com deal was found by Cheapflights users on 6/28. 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.
Mon 9/149:16 pm
IAD
-
MIA
1 stop11h 42m
Frontier
Tue 9/2210:03 am
MIA
-
IAD
1 stop7h 33m
Frontier
Deal found 6/28$179
This Kiwi.com deal was found by Cheapflights users on 6/24. 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.
Sun 8/97:48 am
IAD
-
MIA
1 stop6h 05m
Frontier
Wed 8/1210:50 am
MIA
-
IAD
1 stop6h 24m
Frontier
Deal found 6/24$180
This WAYA deal was found by Cheapflights users on 6/25. 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 WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:49 am
IAD
-
MIA
1 stop6h 04m
Frontier
Wed 7/225:28 pm
MIA
-
IAD
1 stop5h 27m
Frontier
Deal found 6/25$181

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 June 28, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$136

One-way from

$82
(Trip.com)

Popular in

March

Cheapest in

September

Average price

$312
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. 18% potential increase in price ($55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 June 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

Tue 10/27

6:10 am-11:36 am

1 stop5h 26m

Miami

Sun 11/1

8:30 am-4:17 pm

1 stop7h 47m

$293

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 10/31

5:51 pm-11:47 pm

1 stop5h 56m

Miami

Wed 11/11

8:58 am-11:36 am

Nonstop2h 38m

$297

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 9/28

8:25 am-11:20 am

Nonstop2h 55m

Miami

Wed 9/30

1:25 pm-9:27 pm

1 stop8h 02m

$307

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 9/14

8:16 am-11:11 am

Nonstop2h 55m

Miami

Tue 9/15

5:37 pm-10:59 pm

1 stop5h 22m

$307

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 7/17

7:26 pm-12:55 am

1 stop5h 29m

Miami

Mon 7/20

2:09 pm-9:03 pm

1 stop6h 54m

$309

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 9/25

8:25 am-11:20 am

Nonstop2h 55m

Miami

Mon 9/28

1:25 pm-9:27 pm

1 stop8h 02m

$338

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 12/4

7:50 pm-12:52 am

1 stop5h 02m

Miami

Sun 12/13

7:30 pm-12:20 am

1 stop4h 50m

$354

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 11/11

8:16 am-11:09 am

Nonstop2h 53m

Miami

Mon 11/16

8:58 am-11:36 am

Nonstop2h 38m

$373
Quickest round-trip

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 8/10

8:45 am-11:35 am

Nonstop2h 50m

Miami

Fri 8/14

1:44 pm-4:17 pm

Nonstop2h 33m

$377

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 9/11

12:35 pm-6:52 pm

1 stop6h 17m

Miami

Sun 9/13

1:44 pm-4:17 pm

Nonstop2h 33m

$393

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/24

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

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 June 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 afternoon, which can drop the price by up to 52% versus a flight in the morning.

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

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 June 27, 2026.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Key Largo flight should consider departing on Tuesday evenings 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.

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 June 28, 2026.
Read reviews from past customers who have flown Delta,United Airlines, andAmerican 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
7.8
Good
8,455 reviews

Entertainment

7.8

Boarding

8.1

Overall

7.8

Comfort

7.8

Crew

8.5

Food

7.2

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.
Delta
7.8
Good
8,455 reviews
Delta
7.8
Good
8,455 reviews

Entertainment

7.8

Boarding

8.1

Overall

7.8

Comfort

7.8

Crew

8.5

Food

7.2

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.
United Airlines
7.4
Good
9,899 reviews
Delta
7.8
Good
8,455 reviews

Entertainment

7.8

Boarding

8.1

Overall

7.8

Comfort

7.8

Crew

8.5

Food

7.2

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.
American Airlines
7.1
Good
11,776 reviews
Delta
7.8
Good
8,455 reviews

Entertainment

7.8

Boarding

8.1

Overall

7.8

Comfort

7.8

Crew

8.5

Food

7.2

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.
JetBlue
7.1
Good
3,014 reviews
Delta
7.8
Good
8,455 reviews

Entertainment

7.8

Boarding

8.1

Overall

7.8

Comfort

7.8

Crew

8.5

Food

7.2

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.
Frontier
5.6
Fair
2,856 reviews
Delta
7.8
Good
8,455 reviews

Entertainment

7.8

Boarding

8.1

Overall

7.8

Comfort

7.8

Crew

8.5

Food

7.2

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.

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 $293, Delta can have you in Key Largo from Washington, D.C. Dulles Intl Airport in 5h 26m. 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 $90 one-way.

  • 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 $148. On average you can expect to pay $359. The most popular route, (Washington, D.C. Dulles Intl - Miami), can usually be booked for $190.

  • 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.

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 5 airlines flying from Dulles Intl to Key Largo

Discover the top 5 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 June 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$44Average$169FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$83Average$269FlexibilityNo cancel feeOn-time62%
DeltaCheapest$109Average$353FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$122Average$364FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$250Average$407FlexibilityNo cancel feeOn-time71%

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