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Dulles Intl

$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 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — IAD
Sep 9 — Sep 161
Wed 9/9
Wed 9/16
1 adult, Economy
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1. Tell us where you want to go

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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 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 10, 2026.

This Super.com deal was found by Cheapflights users on 8/5. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/293:07 pm -
1 stop7h 45m
Tue 9/16:20 am -
1 stop7h 12m
Deal found 8/5$155
This Expedia deal was found by Cheapflights users on 8/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/195:22 am -
1 stop11h 56m
Sat 9/2612:30 pm -
1 stop9h 30m
Deal found 8/5$156
This Frontier deal was found by Cheapflights users on 8/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:22 am -
1 stop11h 56m
Mon 9/147:50 am -
1 stop8h 39m
Deal found 8/5$157
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/115:32 am -
1 stop11h 46m
Sun 9/137:50 am -
1 stop7h 34m
Deal found 8/9$163
This Frontier deal was found by Cheapflights users on 8/7. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/105:32 am -
1 stop11h 46m
Mon 9/1412:30 pm -
1 stop9h 47m
Deal found 8/7$166
This Kiwi.com deal was found by Cheapflights users on 8/6. 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.
Thu 8/275:28 pm -
1 stop5h 24m
Sun 8/306:20 am -
1 stop10h 01m
Deal found 8/6$167
This FlightHub deal was found by Cheapflights users on 8/8. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/311:10 am -
1 stop6h 04m
Tue 9/86:20 am -
1 stop7h 12m
Deal found 8/8$169
This Kiwi.com deal was found by Cheapflights users on 8/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/235:32 am -
1 stop18h 38m
Wed 9/309:04 pm -
1 stop13h 26m
Deal found 8/9$170
This Trip.com deal was found by Cheapflights users on 8/5. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:28 pm -
1 stop5h 24m
Thu 9/107:50 am -
1 stop7h 34m
Deal found 8/5$171
This Kiwi.com deal was found by Cheapflights users on 8/6. 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.
Thu 9/311:10 am -
1 stop6h 04m
Sun 9/66:20 am -
1 stop10h 01m
Deal found 8/6$172
This Kiwi.com deal was found by Cheapflights users on 8/6. 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.
Thu 9/244:30 pm -
1 stop7h 40m
Wed 9/307:50 am -
1 stop12h 48m
Deal found 8/6$173

Find 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 August 10, 2026.

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

$187
Provider with most accurate pricing for Miami-Washington, D.C. (WAS) flight deals.
Search Deals
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 ($18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Dulles Intl 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 August 10, 2026.
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 9/23

5:37 pm-10:59 pm

1 stop5h 22m

Washington, D.C. Dulles Intl

Sat 9/26

6:45 am-12:13 pm

1 stop5h 28m

$229
Quickest round-trip

MiamiWashington, D.C.

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

MIAIAD

Miami

Thu 9/17

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Mon 9/21

8:16 am-11:11 am

Nonstop2h 55m

$245

MiamiWashington, D.C.

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

MIAIAD

Miami

Thu 10/29

1:25 pm-4:01 pm

Nonstop2h 36m

Washington, D.C. Dulles Intl

Tue 11/3

8:40 am-11:33 am

Nonstop2h 53m

$245

MiamiWashington, D.C.

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

MIAIAD

Miami

Tue 9/1

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Tue 9/8

8:16 am-11:11 am

Nonstop2h 55m

$254

MiamiWashington, D.C.

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

MIAIAD

Miami

Fri 9/4

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Tue 9/8

8:35 am-4:31 pm

1 stop7h 56m

$263

MiamiWashington, D.C.

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

MIAIAD

Miami

Fri 9/11

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Sun 9/13

8:16 am-11:11 am

Nonstop2h 55m

$263

MiamiWashington, D.C.

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

MIAIAD

Miami

Fri 9/11

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Mon 9/14

5:45 pm-11:52 pm

1 stop6h 07m

$273

MiamiWashington, D.C.

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

MIAIAD

Miami

Mon 8/31

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Sat 9/26

6:45 am-12:13 pm

1 stop5h 28m

$289

MiamiWashington, D.C.

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

MIAIAD

Miami

Sat 9/5

1:44 pm-4:17 pm

Nonstop2h 33m

Washington, D.C. Dulles Intl

Mon 9/7

8:35 am-4:31 pm

1 stop7h 56m

$314
Cheapest one-way

MiamiWashington, D.C.

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

MIAIAD

Miami

Sun 9/6

6:00 am-1:43 pm

1 stop7h 43m

$124

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/9

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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

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 10, 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 82% on the cost of your flight, compared to a flight in the evening.

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 $141 and $226 in August.
The cheapest round-trip price found within the last 5 days was $155 on Frontier (Aug 29-Sep 1).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated August 10, 2026.
Read through reviews of airlines operating flights from Key Largo to Washington, D.C. Dulles Intl Airport, such as Delta,United Airlines, andFrontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,497 reviews

Overall

7.8

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Delta
7.8
Good
8,497 reviews
Delta
7.8
Good
8,497 reviews

Overall

7.8

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
United Airlines
7.4
Good
10,097 reviews
Delta
7.8
Good
8,497 reviews

Overall

7.8

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.
Frontier
5.6
Fair
2,715 reviews
Delta
7.8
Good
8,497 reviews

Overall

7.8

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.2

Entertainment

7.8

Reviews

1 / 20
6.0
Good

pilar,May 2025

RSW - ATL

The stewardess was not very nice because I requested two glasses of water. She didn’t even offer the snacks to me. She seemed angry and I felt very bad about her reaction. Also, the flight was full and you could not move. The airline should provide seats for obese people in consideration to the rest pf the passengers.

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.

  • 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.

  • 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 $3,057, our data shows the cheapest flight currently is $158. When looking at the most popular route, (Miami - Washington, D.C. Dulles Intl), you can expect to pay $209 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.

See more FAQs

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

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Owings Mills
Arlington
Tysons
Springfield
Lanham
Reston
Herndon
Rockville
Chantilly
Hyattsville
Fredericksburg
Falls Church
Hanover
Laurel
Sterling
Oxon Hill
Clinton
Hunt Valley
Woodbridge

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Key Largo to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Key Largo to Dulles Intl

Discover the top 4 airlines that operate flights from Key Largo to Dulles Intl. 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 August 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$49Average$148FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$85Average$181FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$117Average$247FlexibilityNo cancel feeOn-time69%
DeltaCheapest$125Average$250FlexibilityNo cancel feeOn-timeN/A

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