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Key Largo

$41+ Cheap flights from Washington, D.C. (WAS) 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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — MIA
Nov 26 — Dec 31
Wed 11/26
Wed 12/3
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Key Largo are usually found in February or January, booked 31 days in advance, depart on a Monday or Saturday and return on a Friday

Find flight deals from Washington, D.C. to Key Largo

Cheapest flights from Washington, D.C. to Key Largo
Explore the most affordable flight options available from Washington, D.C. to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 27, 2025.

This Frontier deal was found by Cheapflights users on 10/27. 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 12/135:52 pmBWI - MIA
Nonstop2h 55mFrontier
Sun 12/215:45 amMIA - BWI
Nonstop2h 43mFrontier
Deal found 10/27$80
This CheapOair deal was found by Cheapflights users on 10/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/133:00 pmBWI - MIA
Nonstop2h 48mFrontier
Mon 11/242:05 pmMIA - BWI
Nonstop2h 41mFrontier
Deal found 10/25$81
This Priceline deal was found by Cheapflights users on 10/25. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/77:52 pmBWI - MIA
Nonstop2h 54mFrontier
Tue 12/93:00 pmMIA - BWI
1 stop9h 24mFrontier
Deal found 10/25$82
This CheapOair deal was found by Cheapflights users on 10/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/163:00 pmBWI - MIA
Nonstop2h 48mFrontier
Fri 11/212:05 pmMIA - BWI
Nonstop2h 41mFrontier
Deal found 10/26$83
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 11/85:59 pmBWI - MIA
Nonstop2h 49mFrontier
Sat 11/152:20 pmMIA - BWI
Nonstop2h 42mFrontier
Deal found 10/27$84
This Frontier deal was found by Cheapflights users on 10/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/155:59 pmBWI - MIA
Nonstop2h 49mFrontier
Fri 11/212:05 pmMIA - BWI
Nonstop2h 41mFrontier
Deal found 10/26$85
This Southwest deal was found by Cheapflights users on 10/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/36:00 pmBWI - MIA
Nonstop2h 45mSouthwest
Fri 12/126:00 amMIA - BWI
Nonstop2h 35mSouthwest
Deal found 10/26$86
This Frontier deal was found by Cheapflights users on 10/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/85:59 pmBWI - MIA
Nonstop2h 49mFrontier
Thu 11/135:01 amMIA - BWI
1 stop10h 19mFrontier
Deal found 10/26$87
This CheapOair deal was found by Cheapflights users on 10/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/133:00 pmBWI - MIA
Nonstop2h 48mFrontier
Thu 11/2011:55 amMIA - BWI
1 stop5h 48mFrontier
Deal found 10/25$90
This CheapOair deal was found by Cheapflights users on 10/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/245:41 pmBWI - MIA
Nonstop2h 49mFrontier
Fri 11/282:05 pmMIA - BWI
Nonstop2h 41mFrontier
Deal found 10/26$91
This Flybillet deal was found by Cheapflights users on 10/26. 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 Flybillet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/68:30 pmBWI - MIA
1 stop11h 53mMultiple Airlines
Sun 12/74:13 pmMIA - BWI
Nonstop2h 44mMultiple Airlines
Deal found 10/26$92
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
Sun 11/94:00 pmIAD - MIA
Nonstop2h 43mMultiple Airlines
Fri 11/1412:05 pmMIA - IAD
1 stop12h 06mMultiple Airlines
Deal found 10/25$92

Cheap flight deals from Washington, D.C. to Key Largo

Keep the following information in mind while searching for Washington, D.C. to Key Largo flight deals. Data was last updated October 27, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$80
(Frontier)

One-way from

$41
(Southwest)

Popular in

December

Cheapest in

February

Average price

$211
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. (WAS) to Key Largo
Search Deals
One-way flight from Washington, D.C. (WAS) to Key Largo
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington, D.C. 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 October 27, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Key Largo that are best for you.

Fly from

Washington, D.C.

Fly to

Key Largo

Route

Depart

Return

Price

BaltimoreMiami

BWI - MIA

BWIMIA

Baltimore/Washington

Mon 12/8

1:25 pm-4:10 pm

Nonstop2h 45m

Miami

Fri 12/12

6:55 am-12:35 pm

2 stops5h 40m

$119

BaltimoreMiami

BWI - MIA

BWIMIA

Baltimore/Washington

Wed 12/3

6:00 pm-8:45 pm

Nonstop2h 45m

Miami

Fri 12/12

6:55 am-12:35 pm

2 stops5h 40m

$124

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Wed 12/3

2:25 pm-5:17 pm

Nonstop2h 52m

Miami

Sat 12/6

11:26 am-2:01 pm

Nonstop2h 35m

$127

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Wed 12/10

2:25 pm-5:17 pm

Nonstop2h 52m

Miami

Wed 12/17

11:24 am-1:59 pm

Nonstop2h 35m

$127

BaltimoreMiami

BWI - MIA

BWIMIA

Baltimore/Washington

Wed 1/7

8:25 am-11:20 am

Nonstop2h 55m

Miami

Thu 1/8

7:55 am-4:55 pm

2 stops9h 00m

$142

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Mon 12/8

2:25 pm-5:17 pm

Nonstop2h 52m

Miami

Thu 12/18

11:26 am-2:01 pm

Nonstop2h 35m

$142

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Tue 12/9

2:25 pm-5:17 pm

Nonstop2h 52m

Miami

Thu 12/18

11:26 am-2:01 pm

Nonstop2h 35m

$142

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Mon 12/15

2:25 pm-5:17 pm

Nonstop2h 52m

Miami

Fri 12/19

11:26 am-2:01 pm

Nonstop2h 35m

$145

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Tue 12/9

2:25 pm-5:17 pm

Nonstop2h 52m

Miami

Fri 12/19

11:26 am-2:01 pm

Nonstop2h 35m

$145

BaltimoreMiami

BWI - MIA

BWIMIA

Baltimore/Washington

Mon 11/17

3:10 pm-8:25 pm

1 stop5h 15m

Miami

Tue 11/18

1:30 pm-4:00 pm

Nonstop2h 30m

$146

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

Showing 1-10 of 60 results
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Best time to book a flight from Washington, D.C. to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from Washington, D.C. 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. to Key Largo

How far ahead should I book a flight from Washington, D.C. to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Key Largo. Price data was last updated on October 24, 2025.

The best time to book flights from Washington, D.C. to Key Largo is 30 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Washington, D.C. to Key Largo?

Currently, March is the cheapest month in which you can book a flight from Washington, D.C. to Key Largo (average of $43). Flying from Washington, D.C. to Key Largo in July is currently the most expensive (average of $89). 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 WAS to KE9?

Find hourly flight availability from Washington, D.C. 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 October 27, 2025.

It’s typically best to fly out from Washington, D.C. to Key Largo in the evening. Doing so could potentially save you 5% on the flight price compared to flying at noon, which is usually more expensive.

What is the cheapest day to fly from Washington, D.C. to Key Largo?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Key Largo. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Washington, D.C. to Key Largo flight should consider departing on Thursday mornings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Washington, D.C. to Key Largo

Explore weekly flight availability from Washington, D.C. 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 October 27, 2025.

The most flights from WAS to KE9 are scheduled on a Friday (23 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (17 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 October 27, 2025.
Read through reviews of airlines operating flights from Washington, D.C. to Key Largo, such as Delta, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
7,996 reviews

Entertainment

7.9

Overall

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

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
7,996 reviews
Delta
7.9
Good
7,996 reviews

Entertainment

7.9

Overall

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

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
8,997 reviews
Delta
7.9
Good
7,996 reviews

Entertainment

7.9

Overall

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

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
11,033 reviews
Delta
7.9
Good
7,996 reviews

Entertainment

7.9

Overall

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

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
8,110 reviews
Delta
7.9
Good
7,996 reviews

Entertainment

7.9

Overall

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

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
3,122 reviews
Delta
7.9
Good
7,996 reviews

Entertainment

7.9

Overall

7.9

Boarding

8.2

Food

7.3

Comfort

7.9

Crew

8.5

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 Washington, D.C. 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. to Key Largo?

    A quick flight from Washington, D.C. to Key Largo can take about 2h 45m. Southwest provides one of the quickest options available for as low as $119. The distance between Washington, D.C. and Key Largo is about 947 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    One-way options have recently been found by users for as low as $41 on Southwest. Other airlines that offer cheap prices include Frontier from $46 and Delta from $64 one-way.

  • What are the most popular routes from Washington, D.C. to Key Largo?

    Most travelers choose Washington, D.C. Dulles Intl - Miami, Washington, D.C. Reagan-National - Miami or Baltimore/Washington - Miami when deciding on the best route from Washington, D.C. to Key Largo.

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

    Before booking your flight to Key Largo from Washington, D.C., check out the most reliable airlines to get you to your destination on time: Copa Airlines (100%), United Airlines (100%), Frontier( 90%).

  • What are the cheapest flights from Washington, D.C. to Key Largo?

    Looking at all options, your cheapest flight can be booked for $39. While the most popular route (Washington, D.C. Dulles Intl - Miami) can be booked for $47 on average, our data indicates $283 when flying from Washington, D.C. to Key Largo.

  • Can I find deals for flights from Washington, D.C. to Key Largo that include hotel bookings?

    Yes. In addition to deals on Washington, D.C. to Key Largo flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington, D.C. to Key Largo?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington, D.C. to Key Largo.

  • Can I find deals for business class flights from Washington, D.C. to Key Largo?

    Yes. Cheapflights offers flight deals from Washington, D.C. 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. to Key Largo?

    Currently, March is the cheapest month in which you can book a flight from Washington, D.C. to Key Largo (average of $43). Flying from Washington, D.C. to Key Largo in July is currently the most expensive (average of $89). 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 Washington, D.C. to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
Dulles Intl to Miami flights
Reagan-National to Miami flights
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Dulles Intl to Tallahassee flights
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Reagan-National to Panama City flights
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Reagan-National to Daytona Beach flights
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Dulles Intl to Melbourne flights
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Reagan-National to Gainesville flights
Dulles Intl to Gainesville flights
Reagan-National to Valdosta flights
Dulles Intl to Valdosta flights

Top 8 airlines flying from Washington, D.C. to Key Largo

Discover the top 8 airlines that operate flights from Washington, D.C. 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 October 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$49Average$176FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$56Average$187FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$95Average$274FlexibilityNo cancel feeOn-time62%
DeltaCheapest$100Average$379FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$126Average$260FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$136Average$357FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$136Average$364FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$158Average$381FlexibilityNo cancel feeOn-time71%

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