How long is the flight from Key Largo to Washington, D.C. Dulles Intl Airport?

Departing from Key Largo to Washington, D.C. Dulles Intl Airport will take you 5h 22m. Airlines will cover a distance of 923 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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 $34. United Airlines flights start at $78 while deals on JetBlue start at $88 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 $3,089, our data shows the cheapest flight currently is $213. When looking at the most popular route, (Miami - Washington, D.C. Dulles Intl), you can expect to pay $213 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.

$77+ Cheap Flights from Key Largo to Washington, D.C. Dulles Intl Airport

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Cheapflights Tip: The best prices from Key Largo to Washington, D.C. Dulles Intl are usually found in November or January, booked 81 days in advance, depart on a Friday or Thursday and return on a Monday

Cheap flight deals from Key Largo to Dulles Intl

Cheapest

Best

Last-minute

One-way

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 August 19, 2026.

Thu 12/37:30 am -

Nonstop2h 42m

Sat 12/58:46 am -

1 stop9h 29m

Deal found 8/18

$142

Thu 9/104:30 pm -

1 stop7h 40m

Mon 9/1412:30 pm -

1 stop9h 47m

Deal found 8/17

$155

Sat 9/195:22 am -

1 stop11h 56m

Mon 9/2112:30 pm -

1 stop9h 47m

Deal found 8/18

$157

Sat 9/265:22 am -

1 stop11h 56m

Mon 9/287:50 am -

1 stop8h 39m

Deal found 8/17

$158

Thu 9/244:30 pm -

1 stop7h 40m

Sat 9/2612:30 pm -

1 stop9h 30m

Deal found 8/19

$160

Tue 9/155:32 am -

1 stop11h 46m

Mon 9/287:50 am -

1 stop8h 39m

Deal found 8/15

$161

Sat 9/125:22 am -

1 stop11h 56m

Mon 9/1412:30 pm -

1 stop9h 47m

Deal found 8/19

$162

Wed 9/95:32 am -

1 stop11h 46m

Tue 9/157:50 am -

1 stop12h 48m

Deal found 8/18

$164

Wed 9/165:32 am -

1 stop11h 46m

Thu 9/1712:30 pm -

1 stop9h 30m

Deal found 8/18

$165

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 August 19, 2026.

Wed 9/165:37 pm -

1 stop5h 22m

Wed 9/238:16 am -

Nonstop2h 55m

Deal found 8/19

$223

Wed 9/306:00 am -

1 stop5h 30m

Wed 10/73:03 pm -

1 stop4h 40m

Deal found 8/16

$229

Wed 9/96:00 am -

1 stop5h 30m

Wed 9/166:10 am -

1 stop5h 57m

Deal found 8/17

$233

Thu 10/2211:47 am -

1 stop5h 46m

Tue 10/2712:30 pm -

1 stop6h 15m

Deal found 8/16

$237

Fri 9/115:37 pm -

1 stop5h 22m

Sun 9/135:45 pm -

1 stop6h 07m

Deal found 8/19

$287

Thu 10/221:26 pm -

Nonstop2h 33m

Mon 10/268:40 am -

Nonstop2h 53m

Deal found 8/18

$297

Thu 10/2211:47 am -

1 stop5h 46m

Sun 10/256:00 am -

1 stop5h 00m

Deal found 8/19

$312

Thu 9/101:44 pm -

Nonstop2h 33m

Fri 9/188:16 am -

Nonstop2h 55m

Deal found 8/15

$312

Fri 9/181:44 pm -

Nonstop2h 33m

Thu 9/248:25 am -

Nonstop2h 55m

Deal found 8/17

$313

Wed 9/161:44 pm -

Nonstop2h 33m

Sun 9/208:16 am -

Nonstop2h 55m

Deal found 8/18

$338

Thu 10/88:54 am -

1 stop7h 29m

Sun 10/118:25 am -

Nonstop2h 55m

Deal found 8/15

$348

Thu 9/31:44 pm -

Nonstop2h 33m

Mon 9/78:35 am -

1 stop7h 56m

Deal found 8/18

$359

Last-minute flights from Key Largo to Dulles Intl
Discover last-minute flight deals from Key Largo to Dulles Intl. Data last updated August 19, 2026 and is based on user searches.

Wed 9/95:32 am -

1 stop11h 46m

Tue 9/157:50 am -

1 stop12h 48m

Deal found 8/18

$164

Thu 9/104:30 pm -

1 stop7h 40m

Mon 9/1412:30 pm -

1 stop9h 47m

Deal found 8/17

$155

Sat 9/125:22 am -

1 stop11h 56m

Mon 9/1412:30 pm -

1 stop9h 47m

Deal found 8/19

$162

Tue 9/155:32 am -

1 stop11h 46m

Mon 9/287:50 am -

1 stop8h 39m

Deal found 8/15

$161

Wed 9/165:32 am -

1 stop11h 46m

Thu 9/1712:30 pm -

1 stop9h 30m

Deal found 8/18

$165

Sat 9/195:22 am -

1 stop11h 56m

Mon 9/2112:30 pm -

1 stop9h 47m

Deal found 8/18

$157

Tue 9/225:32 am -

1 stop11h 46m

Thu 10/17:50 am -

1 stop7h 34m

Deal found 8/19

$167

Thu 9/244:30 pm -

1 stop7h 40m

Sat 9/2612:30 pm -

1 stop9h 30m

Deal found 8/19

$160

Sat 9/265:22 am -

1 stop11h 56m

Mon 9/287:50 am -

1 stop8h 39m

Deal found 8/17

$158

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 August 19, 2026.

Thu 9/174:30 pm -

1 stop7h 40m

Deal found 8/17

$77

Tue 9/811:10 am -

1 stop6h 04m

Deal found 8/17

$78

Sat 9/265:22 am -

1 stop11h 56m

Deal found 8/14

$80

Tue 9/155:32 am -

1 stop11h 46m

Deal found 8/16

$82

Wed 9/165:32 am -

1 stop11h 46m

Deal found 8/17

$85

Fri 9/189:30 pm -

1 stop26h 40m

Deal found 8/17

$86

Tue 9/295:32 am -

1 stop11h 46m

Deal found 8/14

$87

Wed 10/2110:36 pm -

1 stop18h 42m

Deal found 8/19

$88

Find flight deals from Key Largo to Dulles Intl

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$155 (Super.com)
One-way from	$77 (Super.com)
Popular in	July
Cheapest in	November
Average price	$184

Provider with most accurate pricing for Miami-Washington, D.C. (WAS) flight deals.

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Provider most trusted by Cheapflights users for Miami-Washington, D.C. (WAS) flights.

Search Deals

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 29% potential increase in price ($90 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 8% potential price decrease ($17 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 2026

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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

Cheapest round-trip

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Wed 9/16

5:37 pm-10:59 pm

1 stop5h 22m

Washington, D.C. Dulles Intl

Wed 9/23

8:16 am-11:11 am

Nonstop2h 55m

$223

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Wed 9/30

6:00 am-11:30 am

1 stop5h 30m

Washington, D.C. Dulles Intl

Wed 10/7

3:03 pm-7:43 pm

1 stop4h 40m

$229

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Wed 9/9

6:00 am-11:30 am

1 stop5h 30m

Washington, D.C. Dulles Intl

Wed 9/16

6:10 am-12:07 pm

1 stop5h 57m

$233

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Thu 10/22

11:47 am-5:33 pm

1 stop5h 46m

Washington, D.C. Dulles Intl

Tue 10/27

12:30 pm-6:45 pm

1 stop6h 15m

$237

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Fri 9/11

5:37 pm-10:59 pm

1 stop5h 22m

Washington, D.C. Dulles Intl

Sun 9/13

5:45 pm-11:52 pm

1 stop6h 07m

$287

Quickest round-trip

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Thu 10/22

1:26 pm-3:59 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Mon 10/26

8:40 am-11:33 am

Nonstop2h 53m

$297

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Thu 10/22

11:47 am-5:33 pm

1 stop5h 46m

Washington, D.C. Dulles Intl

Sun 10/25

6:00 am-11:00 am

1 stop5h 00m

$312

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Thu 9/10

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Fri 9/18

8:16 am-11:11 am

Nonstop2h 55m

$312

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Fri 9/18

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Thu 9/24

8:25 am-11:20 am

Nonstop2h 55m

$313

MiamiWashington, D.C.

MIA Miami - IAD Washington, D.C. Dulles Intl

MIAIAD

Miami

Wed 9/16

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Sun 9/20

8:16 am-11:11 am

Nonstop2h 55m

$338

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/15

Showing 1-10 of 24 resultsSorted by cheapest first

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.

MIA-IAD

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

KE9-IAD

MIA-IAD

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

It’s optimal to fly from Key Largo to Washington, D.C. Dulles Intl Airport in the morning. By choosing this option you can save up to 83% on the cost of your flight, compared to a flight in the evening.

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

The most flights from KE9 to IAD are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

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

Airfare is typical for this route at the moment.

Key Largo to Washington, D.C. Dulles Intl Airport flights typically cost between $139 and $217 in September.
The cheapest round-trip price found within the last 5 days was $155 on Frontier (Sep 10-Sep 14).

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 and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

10,102 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

United Airlines

7.4

Good

10,102 reviews

United Airlines

7.4

Good

10,102 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Frontier

5.6

Fair

2,659 reviews

United Airlines

7.4

Good

10,102 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

How long is the flight from Key Largo to Washington, D.C. Dulles Intl Airport?
Departing from Key Largo to Washington, D.C. Dulles Intl Airport will take you 5h 22m. Airlines will cover a distance of 923 mi. Both multi-stop and nonstop flights can be found to your destination and back.
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 $34. United Airlines flights start at $78 while deals on JetBlue start at $88 one-way.
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 $3,089, our data shows the cheapest flight currently is $213. When looking at the most popular route, (Miami - Washington, D.C. Dulles Intl), you can expect to pay $213 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.

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Top 4 airlines flying from Key Largo to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$49	Average$141	FlexibilityNo cancel fee	On-time62%
JetBlue	Cheapest$85	Average$181	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$117	Average$247	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$125	Average$250	FlexibilityNo cancel fee	On-timeN/A

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$77+ 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 9/17. 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

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Cheap 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 August 19, 2026.

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 August 19, 2026.

Best flights from Key Largo to Dulles IntlDiscover 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 August 19, 2026.

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 August 19, 2026.

Last-minute flights from Key Largo to Dulles IntlDiscover last-minute flight deals from Key Largo to Dulles Intl. Data last updated August 19, 2026 and is based on user searches.

Discover last-minute flight deals from Key Largo to Dulles Intl. Data last updated August 19, 2026 and is based on user searches.

One-way flights from Key Largo to Dulles IntlSearch for one-way flight options from Key Largo to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated August 19, 2026.

Search for one-way flight options from Key Largo to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated August 19, 2026.

Find flight deals from Key Largo to Dulles Intl

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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

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 August 19, 2026.

It’s optimal to fly from Key Largo to Washington, D.C. Dulles Intl Airport in the morning. By choosing this option you can save up to 83% on the cost of your flight, compared to a flight in the evening.

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

The most flights from KE9 to IAD are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

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

Airfare is typical for this route at the moment.

Key Largo to Washington, D.C. Dulles Intl Airport flights typically cost between $139 and $217 in September.The cheapest round-trip price found within the last 5 days was $155 on Frontier (Sep 10-Sep 14).

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 and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from Key Largo to Washington, D.C. Dulles Intl Airport?

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

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?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Key Largo to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Dulles Intl by adding a car rental and/or hotel reservation to your travel itinerary.

Other flights to Dulles Intl

Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 19, 2026.

Search flights from Key Largo to Dulles Intl by cabin class

Find flights from Key Largo to Dulles Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Key Largo and Dulles Intl flights

Browse other Key Largo and Dulles Intl flight options. Last updated on August 19, 2026.

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Key Largo to Dulles Intl flights

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Top 4 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 August 19, 2026.

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 August 19, 2026.

Last-minute flights from Key Largo to Dulles Intl
Discover last-minute flight deals from Key Largo to Dulles Intl. Data last updated August 19, 2026 and is based on user searches.

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 August 19, 2026.

Key Largo to Washington, D.C. Dulles Intl Airport flights typically cost between $139 and $217 in September.
The cheapest round-trip price found within the last 5 days was $155 on Frontier (Sep 10-Sep 14).