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Key Largo

$44+ 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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — MIA
Mar 8 — Mar 151
Sun 3/8
Sun 3/15
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 September, booked 30 days in advance, depart on a Monday or Sunday and return on a Friday

Cheap 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 February 6, 2026.

This Frontier deal was found by Cheapflights users on 2/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/199:13 pm
BWI
-
MIA
Nonstop2h 53m
Frontier
Thu 2/268:00 am
MIA
-
BWI
Nonstop2h 51m
Frontier
Deal found 2/6$92
This Frontier deal was found by Cheapflights users on 2/3. 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 2/199:13 pm
BWI
-
MIA
Nonstop2h 53m
Frontier
Sat 2/2111:28 am
MIA
-
BWI
Nonstop2h 51m
Frontier
Deal found 2/3$93
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 4/216:05 am
BWI
-
MIA
1 stop6h 33m
Multiple Airlines
Fri 4/245:30 am
MIA
-
BWI
Nonstop2h 50m
Multiple Airlines
Deal found 2/5$94
This WAYA deal was found by Cheapflights users on 2/3. 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.
Mon 3/28:54 am
BWI
-
MIA
Nonstop2h 56m
Multiple Airlines
Wed 3/117:05 am
MIA
-
BWI
1 stop7h 19m
Multiple Airlines
Deal found 2/3$95
This WAYA deal was found by Cheapflights users on 2/5. 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.
Sat 3/74:53 pm
BWI
-
MIA
1 stop7h 54m
Frontier
Thu 3/125:01 am
MIA
-
BWI
Nonstop2h 44m
Frontier
Deal found 2/5$96
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 3/28:54 am
BWI
-
MIA
Nonstop2h 56m
Frontier
Sat 3/75:05 am
MIA
-
BWI
1 stop10h 53m
Frontier
Deal found 2/5$97
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 3/28:54 am
BWI
-
MIA
Nonstop2h 56m
Multiple Airlines
Tue 3/107:05 am
MIA
-
BWI
1 stop7h 19m
Multiple Airlines
Deal found 2/5$98
This Frontier deal was found by Cheapflights users on 2/3. 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 3/128:30 am
BWI
-
MIA
Nonstop2h 56m
Frontier
Sun 3/225:01 am
MIA
-
BWI
Nonstop2h 44m
Frontier
Deal found 2/3$99
This WAYA deal was found by Cheapflights users on 2/5. 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.
Sat 3/144:47 pm
BWI
-
MIA
1 stop8h 00m
Frontier
Thu 3/195:01 am
MIA
-
BWI
Nonstop2h 44m
Frontier
Deal found 2/5$101
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 3/78:10 pm
BWI
-
MIA
Nonstop2h 54m
Frontier
Mon 3/95:05 am
MIA
-
BWI
1 stop9h 19m
Frontier
Deal found 2/3$102
This Kiwi.com deal was found by Cheapflights users on 2/5. 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 2/236:08 pm
BWI
-
MIA
1 stop18h 08m
Multiple Airlines
Fri 2/275:05 am
MIA
-
BWI
Nonstop2h 44m
Multiple Airlines
Deal found 2/5$103
This Kiwi.com deal was found by Cheapflights users on 2/6. 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.
Mon 2/237:05 pm
IAD
-
MIA
Nonstop2h 52m
Frontier
Fri 2/2711:35 am
MIA
-
IAD
1 stop21h 59m
Frontier
Deal found 2/6$106

Find 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 February 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$92
(Frontier)

One-way from

$44
(Frontier)

Popular in

April

Cheapest in

February

Average price

$137
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. 13% potential increase in price ($34 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 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 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 February 6, 2026.
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

Sun 3/8

8:20 pm-11:00 pm

Nonstop2h 40m

Miami

Fri 3/13

6:00 am-8:40 am

Nonstop2h 40m

$137

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Sat 5/2

3:00 pm-5:40 pm

Nonstop2h 40m

Miami

Sat 5/9

11:10 am-1:49 pm

Nonstop2h 39m

$144

BaltimoreMiami

BWI - MIA

BWIMIA

Baltimore/Washington

Tue 3/3

1:25 pm-4:10 pm

Nonstop2h 45m

Miami

Wed 3/11

12:55 pm-8:15 pm

1 stop7h 20m

$147

BaltimoreMiami

BWI - MIA

BWIMIA

Baltimore/Washington

Mon 3/2

2:20 pm-5:10 pm

Nonstop2h 50m

Miami

Fri 3/6

6:00 am-8:40 am

Nonstop2h 40m

$147

BaltimoreMiami

BWI - MIA

BWIMIA

Baltimore/Washington

Mon 3/23

5:25 pm-10:05 pm

1 stop4h 40m

Miami

Wed 3/25

5:45 pm-8:30 pm

Nonstop2h 45m

$147

BaltimoreMiami

BWI - MIA

BWIMIA

Baltimore/Washington

Sun 3/1

8:30 pm-11:15 pm

Nonstop2h 45m

Miami

Wed 3/4

7:15 am-9:55 am

Nonstop2h 40m

$147

Washington, D.C.Miami

IAD - MIA

IADMIA

Washington, D.C. Dulles Intl

Sat 2/28

1:20 pm-4:21 pm

Nonstop3h 01m

Miami

Wed 3/4

6:35 pm-9:25 pm

Nonstop2h 50m

$156

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Sat 4/25

12:00 pm-8:20 pm

2 stops8h 20m

Miami

Tue 4/28

12:10 pm-6:20 pm

1 stop6h 10m

$156

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Sun 5/3

6:10 am-7:15 pm

1 stop13h 05m

Miami

Wed 5/6

3:00 pm-11:00 pm

1 stop8h 00m

$156

Washington, D.C.Miami

DCA - MIA

DCAMIA

Washington, D.C. Reagan-National

Tue 3/10

9:05 am-2:55 pm

1 stop5h 50m

Miami

Thu 3/12

5:10 am-12:10 pm

1 stop7h 00m

$157

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/4

Showing 1-10 of 59 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 January 30, 2026.

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 $47). Flying from Washington, D.C. to Key Largo in July is currently the most expensive (average of $90). 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 February 6, 2026.

It’s typically best to fly out from Washington, D.C. to Key Largo in the evening. Doing so could potentially save you 37% on the flight price compared to flying in the morning, 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 January 31, 2026.

Travelers seeking maximum savings on their Washington, D.C. 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. 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 February 6, 2026.

The most flights from WAS to KE9 are scheduled on a Wednesday (27 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (13 on average).

How much does it cost to fly round-trip from Washington, D.C. 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 6, 2026.
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
8,159 reviews

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

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
8,159 reviews
Delta
7.9
Good
8,159 reviews

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

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
9,244 reviews
Delta
7.9
Good
8,159 reviews

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

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
11,246 reviews
Delta
7.9
Good
8,159 reviews

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

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.
Spirit Airlines
6.3
Okay
8,421 reviews
Delta
7.9
Good
8,159 reviews

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

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
3,054 reviews
Delta
7.9
Good
8,159 reviews

Crew

8.5

Food

7.2

Boarding

8.1

Entertainment

7.8

Overall

7.9

Comfort

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 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 40m. Southwest provides one of the quickest options available for as low as $137. The distance between Washington, D.C. and Key Largo is about 947 mi. Generally, flights for this route are nonstop.

  • 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 $29 on Frontier. Other airlines that offer cheap prices include Spirit Airlines from $57 and JetBlue from $58 one-way.

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

    Most travelers choose Washington, D.C. Reagan-National - Miami, Washington, D.C. Dulles Intl - 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: Volaris (89%), Copa Airlines (79%), United Airlines( 79%).

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

    Looking at all options, your cheapest flight can be booked for $29. While the most popular route (Washington, D.C. Reagan-National - Miami) can be booked for $117 on average, our data indicates $498 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 $47). Flying from Washington, D.C. to Key Largo in July is currently the most expensive (average of $90). 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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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 February 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$37Average$180FlexibilityNo cancel feeOn-time65%
FrontierCheapest$47Average$174FlexibilityNo cancel feeOn-time62%
DeltaCheapest$83Average$383FlexibilityNo cancel feeOn-timeN/A
JetBlueCheapest$83Average$245FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$117Average$362FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$120Average$326FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$126Average$260FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$151Average$382FlexibilityNo cancel feeOn-time71%

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