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

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $61. United Airlines flights start at $74 while deals on American Airlines start at $126 one-way.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What are the cheapest flights from Key Largo to Washington, D.C. Dulles Intl Airport?

While on average a flight from Key Largo to Washington, D.C. Dulles Intl Airport is generally $2,598, our data shows the cheapest flight currently is $39. When looking at the most popular route, (Miami - Washington, D.C. Dulles Intl), you can expect to pay $80 for that flight.

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

No one likes to see their flight delayed. When booking a flight from Key Largo to Washington, D.C. Dulles Intl Airport consider choosing United Airlines (89%), Copa Airlines (77%) or Frontier (54%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Key Largo to Washington, D.C. Dulles Intl Airport?

American Airlines, Delta and Frontier are the most popular airlines when flying from Key Largo to Washington, D.C. Dulles Intl Airport.

What is the cheapest month to fly from Key Largo to Washington, D.C. Dulles Intl Airport?

Our data shows that February tends to be the cheapest month to fly to Washington, D.C. Dulles Intl Airport from Key Largo. Users have commonly found prices around $178 for the month, but tickets can be as low as $49. Due to multiple factors, prepare for potentially higher prices in December.

Can I find deals for flights from Key Largo to Dulles Intl that include hotel bookings?

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

How can I find direct flights from Key Largo to Dulles Intl?

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

Can I find deals for business class flights from Key Largo to Dulles Intl?

Yes. Cheapflights offers flight deals from Key Largo to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$61+ Flights from Key Largo to Washington, D.C. Dulles Intl Airport

Q: How far in advance should I book a flight from Key Largo to Washington, D.C. Dulles Intl Airport?

To save on the cost of your flight from Key Largo to Washington, D.C. Dulles Intl Airport, book at least 29 days before your planned departure. Booking around this time can save you about 88% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $138 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $304.

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Find cheap flights from Key Largo to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

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We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Key Largo to Washington, D.C. Dulles Intl are usually found in June or July, booked 65 days in advance, depart on a Friday or Thursday and return on a Saturday

Cheap flight deals from Key Largo to Dulles Intl

Round-trip from	$101 (Cheapflightsfares)
One-way from	$61 (Frontier)
Popular in	December
Cheapest in	June
Average price	$173

From Key Largo to Washington, D.C. Dulles Intl

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One-way flight from Key Largo to Washington, D.C. Dulles Intl

Search Deals

Highest demand for flights based on searches. 16% potential increase in price ($46 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Find flight deals from Key Largo to Dulles Intl

Cheapest flights from Key Largo to Dulles Intl
Explore the most affordable flight options available from Key Largo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Fri 8/294:34 pmMIA - IAD

Nonstop2h 50mFrontier

Mon 9/18:19 pmIAD - MIA

Nonstop2h 47mFrontier

Deal found 7/29

$101

Wed 8/2712:50 pmMIA - IAD

Nonstop2h 35mUnited Airlines

Wed 9/36:20 amIAD - MIA

1 stop7h 51mUnited Airlines

Deal found 7/29

$177

Best flights from Key Largo to Dulles Intl
Discover carefully curated flight deals from Key Largo to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 30, 2025.

Fri 8/294:34 pmMIA - IAD

Nonstop2h 50mFrontier

Mon 9/18:19 pmIAD - MIA

Nonstop2h 47mFrontier

Deal found 7/29

$101

Wed 8/2712:50 pmMIA - IAD

Nonstop2h 35mUnited Airlines

Tue 9/28:40 amIAD - MIA

1 stop5h 31mUnited Airlines

Deal found 7/27

$175

Last-minute flights from Key Largo to Dulles Intl
Discover last-minute flight deals from Key Largo to Dulles Intl. Data last updated July 30, 2025 and is based on user searches.

Wed 8/61:35 pmMIA - IAD

Nonstop2h 40mUnited Airlines

Wed 8/139:00 amIAD - MIA

Nonstop2h 49mUnited Airlines

Deal found 7/30

$201

Sat 8/93:40 pmMIA - IAD

Nonstop2h 50mFrontier

Mon 8/119:58 pmIAD - MIA

Nonstop2h 47mFrontier

Deal found 7/28

$123

Wed 8/2712:50 pmMIA - IAD

Nonstop2h 35mUnited Airlines

Wed 9/36:20 amIAD - MIA

1 stop7h 51mUnited Airlines

Deal found 7/29

$177

Fri 8/294:34 pmMIA - IAD

Nonstop2h 50mFrontier

Mon 9/18:19 pmIAD - MIA

Nonstop2h 47mFrontier

Deal found 7/29

$101

One-way flights from Key Largo to Dulles Intl
Search for one-way flight options from Key Largo to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated July 30, 2025.

Mon 9/1511:35 amMIA - IAD

Nonstop2h 50mFrontier

Deal found 7/27

$61

Wed 9/312:50 pmMIA - IAD

Nonstop2h 35mUnited Airlines

Deal found 7/28

$74

Sun 9/289:54 amMIA - IAD

3 stops25h 29mMultiple Airlines

Deal found 7/28

$124

Sat 8/236:16 amMIA - IAD

1 stop6h 32mAmerican Airlines

Deal found 7/30

$126

Cheapflights Fare Finder

Use the filters below to find and compare flights from Key Largo to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Fri 8/29

4:34 pm-7:24 pm

Nonstop2h 50m

Washington, D.C. Dulles Intl

Mon 9/1

8:19 pm-11:06 pm

Nonstop2h 47m

$101

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Wed 8/27

12:50 pm-3:25 pm

Nonstop2h 35m

Washington, D.C. Dulles Intl

Tue 9/2

8:40 am-2:11 pm

1 stop5h 31m

$175

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Mon 9/15

11:35 am-2:25 pm

Nonstop2h 50m

$61

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Wed 9/3

12:50 pm-3:25 pm

Nonstop2h 35m

$74

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Sun 9/28

9:54 am-11:23 am

3 stops25h 29m

$124

MiamiWashington, D.C.

MIA - IAD

MIAIAD

Miami

Sat 8/23

6:16 am-12:48 pm

1 stop6h 32m

$126

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Best time to book a flight from Key Largo to Dulles Intl

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

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

Booking 65 days in advance of your planned departure date is, on average, the best time to get cheap flights from Key Largo to Washington, D.C. Dulles Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, July is the cheapest month in which you can book a flight from Key Largo to Washington, D.C. Dulles Intl Airport (average of $306). Flying from Key Largo to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 KE9 to IAD?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Key Largo to Washington, D.C. Dulles Intl Airport as you normally would.

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

Travelers seeking maximum savings on their Key Largo to Washington, D.C. Dulles Intl Airport flight should consider departing on Wednesday afternoons when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Dulles Intl

Read through reviews of airlines operating flights from Key Largo to Washington, D.C. Dulles Intl Airport, such as United Airlines, American Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,896 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

United Airlines

7.4

Good

8,896 reviews

United Airlines

7.4

Good

8,896 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

American Airlines

7.2

Good

10,000 reviews

United Airlines

7.4

Good

8,896 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Frontier

5.9

Fair

3,237 reviews

United Airlines

7.4

Good

8,896 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

What are the cheapest airlines to fly from Key Largo to Washington, D.C. Dulles Intl Airport one-way?
To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $61. United Airlines flights start at $74 while deals on American Airlines start at $126 one-way.
What are the most reliable airlines from Key Largo to Washington, D.C. Dulles Intl Airport?
No one likes to see their flight delayed. When booking a flight from Key Largo to Washington, D.C. Dulles Intl Airport consider choosing United Airlines (89%), Copa Airlines (77%) or Frontier (54%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Key Largo to Washington, D.C. Dulles Intl Airport?
While on average a flight from Key Largo to Washington, D.C. Dulles Intl Airport is generally $2,598, our data shows the cheapest flight currently is $39. When looking at the most popular route, (Miami - Washington, D.C. Dulles Intl), you can expect to pay $80 for that flight.
Can I find deals for flights from Key Largo to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Key Largo to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Key Largo to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Key Largo to Dulles Intl.
Can I find deals for business class flights from Key Largo to Dulles Intl?
Yes. Cheapflights offers flight deals from Key Largo to Dulles Intl 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 Key Largo to Washington, D.C. Dulles Intl Airport?
Currently, July is the cheapest month in which you can book a flight from Key Largo to Washington, D.C. Dulles Intl Airport (average of $306). Flying from Key Largo to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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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Browse thousands of different options on Cheapflights for your next trip

Top 6 airlines flying from Key Largo to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
JetBlue	Cheapest$57	Average$147	FlexibilityNo cancel fee	On-time62%
Frontier	Cheapest$78	Average$152	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$96	Average$129	FlexibilityNo cancel fee	On-time65%
Delta	Cheapest$108	Average$229	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$137	Average$278	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$250	Average$337	FlexibilityNo cancel fee	On-time71%

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$61+ Cheap flights from Key Largo, FL to Dulles Intl (IAD)

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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Key Largo to Dulles Intl with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Key Largo to Washington, D.C. Dulles Intl are usually found in June or July, booked 65 days in advance, depart on a Friday or Thursday and return on a Saturday

Cheap flight deals from Key Largo to Dulles Intl

Keep the following information in mind while searching for Key Largo to Dulles Intl flight deals. Data was last updated July 30, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Key Largo to Dulles Intl

Cheapest flights from Key Largo to Dulles IntlExplore the most affordable flight options available from Key Largo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Explore the most affordable flight options available from Key Largo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Key Largo to Washington, D.C. Dulles Intl Airport that are best for you.

Best time to book a flight from Key Largo to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Key Largo with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Key Largo to Washington, D.C. Dulles Intl Airport

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

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Dulles Intl. Price data was last updated on July 25, 2025.

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

What is the cheapest time of day to fly from KE9 to IAD?

Find hourly flight availability from Key Largo to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

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

Use this chart to determine the cheapest time to fly round-trip from Key Largo to Dulles Intl. Price data was last updated on February 16, 2025.

Reviews of airlines servicing Dulles Intl

Read through reviews of airlines operating flights from Key Largo to Washington, D.C. Dulles Intl Airport, such as United Airlines, American Airlines, and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Key Largo to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

What are the cheapest flights from Key Largo to Washington, D.C. Dulles Intl Airport?

Can I find deals for flights from Key Largo to Dulles Intl that include hotel bookings?

How can I find direct flights from Key Largo to Dulles Intl?

Can I find deals for business class flights from Key Largo to Dulles Intl?

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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

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Alternative routes for Key Largo to Dulles Intl

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Top 6 airlines flying from Key Largo to Dulles Intl

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Cheapest flights from Key Largo to Dulles Intl
Explore the most affordable flight options available from Key Largo to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.