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Key Largo

$63+ 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 6/29. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — MIA
Jun 10 — Jun 171
Wed 6/10
Wed 6/17
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 May 11, 2026.

This Kiwi.com deal was found by Cheapflights users on 5/10. 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 8/511:17 am
IAD
-
MIA
1 stop5h 16m
Frontier
Thu 8/138:30 am
MIA
-
IAD
1 stop7h 41m
Frontier
Deal found 5/10$138
This Kiwi.com deal was found by Cheapflights users on 5/10. 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 6/17:45 am
IAD
-
MIA
1 stop5h 35m
Frontier
Wed 6/1711:19 am
MIA
-
IAD
1 stop6h 12m
Frontier
Deal found 5/10$139
This Jetabroad deal was found by Cheapflights users on 5/7. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/2011:17 am
IAD
-
MIA
1 stop26h 36m
Frontier
Thu 7/238:30 am
MIA
-
IAD
1 stop7h 41m
Frontier
Deal found 5/7$141
This Jetabroad deal was found by Cheapflights users on 5/9. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/1311:17 am
IAD
-
MIA
1 stop11h 48m
Frontier
Fri 7/178:30 am
MIA
-
IAD
1 stop25h 20m
Frontier
Deal found 5/9$142
This Jetabroad deal was found by Cheapflights users on 5/9. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1711:17 am
IAD
-
MIA
1 stop11h 48m
Frontier
Fri 8/218:10 am
MIA
-
IAD
1 stop9h 31m
Frontier
Deal found 5/9$143
This Jetabroad deal was found by Cheapflights users on 5/7. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/198:57 pm
IAD
-
MIA
1 stop26h 08m
Frontier
Wed 7/225:28 pm
MIA
-
IAD
1 stop22h 43m
Frontier
Deal found 5/7$144
This Jetabroad deal was found by Cheapflights users on 5/10. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/288:47 pm
IAD
-
MIA
1 stop26h 16m
Frontier
Sat 9/58:10 am
MIA
-
IAD
1 stop26h 06m
Frontier
Deal found 5/10$148
This Kiwi.com deal was found by Cheapflights users on 5/7. 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 8/2711:11 am
IAD
-
MIA
1 stop5h 20m
Frontier
Mon 8/316:00 am
MIA
-
IAD
1 stop12h 42m
Frontier
Deal found 5/7$149
This Kiwi.com deal was found by Cheapflights users on 5/7. 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 7/811:17 am
IAD
-
MIA
1 stop5h 16m
Frontier
Fri 7/178:30 am
MIA
-
IAD
1 stop8h 55m
Frontier
Deal found 5/7$152
This Kiwi.com deal was found by Cheapflights users on 5/6. 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 6/307:30 am
IAD
-
MIA
1 stop6h 19m
Frontier
Fri 7/105:28 pm
MIA
-
IAD
1 stop5h 45m
Frontier
Deal found 5/6$153
This eDestinos deal was found by Cheapflights users on 5/8. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/208:57 pm
IAD
-
MIA
1 stop19h 36m
Frontier
Sat 8/85:48 pm
MIA
-
IAD
1 stop16h 25m
Frontier
Deal found 5/8$155

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 May 11, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$138
(Kiwi.com)

One-way from

$63
(Kiwi.com)

Popular in

March

Cheapest in

September

Average price

$288
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. 23% potential increase in price ($70 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 May 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 May 11, 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 10/10

5:30 pm-12:52 am

1 stop7h 22m

Miami

Sat 10/17

6:00 am-11:59 am

1 stop5h 59m

$251

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 7/25

5:25 pm-12:55 am

1 stop7h 30m

Miami

Thu 7/30

7:10 am-11:37 am

1 stop4h 27m

$251

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 10/3

4:00 pm-10:48 pm

1 stop6h 48m

Miami

Sat 10/10

7:30 pm-12:05 am

1 stop4h 35m

$251

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Mon 6/29

8:45 am-11:35 am

Nonstop2h 50m

Miami

Wed 7/15

1:10 pm-3:53 pm

Nonstop2h 43m

$311

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 10/2

6:45 am-12:15 pm

1 stop5h 30m

Miami

Mon 10/5

1:20 pm-3:52 pm

Nonstop2h 32m

$324

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 7/11

8:45 am-11:35 am

Nonstop2h 50m

Miami

Thu 7/16

1:10 pm-3:53 pm

Nonstop2h 43m

$365

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Tue 6/16

8:45 am-11:35 am

Nonstop2h 50m

Miami

Wed 6/17

5:22 pm-11:19 pm

1 stop5h 57m

$397
Quickest round-trip

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Fri 10/23

8:16 am-11:10 am

Nonstop2h 54m

Miami

Mon 10/26

1:25 pm-4:03 pm

Nonstop2h 38m

$408

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Wed 7/29

8:45 am-11:35 am

Nonstop2h 50m

Miami

Mon 8/3

5:22 pm-11:19 pm

1 stop5h 57m

$415

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 5/23

8:45 am-11:35 am

Nonstop2h 50m

Miami

Thu 5/28

1:10 pm-3:53 pm

Nonstop2h 43m

$424

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/9

Showing 1-10 of 24 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 May 11, 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 47% 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 May 9, 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 May 11, 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
8,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

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
7.9
Good
8,452 reviews
Delta
7.9
Good
8,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

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
9,698 reviews
Delta
7.9
Good
8,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

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
7.2
Good
2,974 reviews
Delta
7.9
Good
8,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

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
11,669 reviews
Delta
7.9
Good
8,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

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
2,955 reviews
Delta
7.9
Good
8,452 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

7.9

Entertainment

7.8

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 $241, United Airlines 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 $88 one-way.

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

    Consider United Airlines (93%), Copa Airlines (87%) or Frontier (53%) 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 $97. On average you can expect to pay $285. The most popular route, (Washington, D.C. Dulles Intl - Miami), can usually be booked for $145.

  • 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 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 May 11, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$33Average$160FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$37Average$167FlexibilityNo cancel feeOn-time65%
DeltaCheapest$68Average$369FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$83Average$266FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$119Average$358FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$251Average$405FlexibilityNo cancel feeOn-time71%

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