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Cheap flights from Washington, D.C. Dulles Intl Airport to Key West from $99

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Washington, D.C. Dulles Intl Airport to Key West departing on 12/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Washington, D.C. Dulles Intl Airport to Key West

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
3:36 pm - 10:07 amIAD-EYW
18h 31m1 stop
Multiple Airlines Logo
12:20 pm - 12:19 amEYW-IAD
11h 59m2 stops
$279Multiple Airlines
Find Deal
Fri, Dec 12 - Sun, Dec 14
Multiple Airlines Logo
5:34 pm - 9:17 amIAD-EYW
15h 43m2 stops
Multiple Airlines Logo
10:41 am - 4:06 pmEYW-IAD
5h 25m1 stop
$281Multiple Airlines
Find Deal
Thu, Nov 13 - Mon, Nov 17
Multiple Airlines Logo
7:57 pm - 1:39 pmIAD-EYW
17h 42m1 stop
Multiple Airlines Logo
12:20 pm - 12:19 amEYW-IAD
11h 59m2 stops
$284Multiple Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 7
Delta Logo
3:33 pm - 8:06 pmIAD-EYW
4h 33m1 stop
Delta Logo
6:17 pm - 11:20 pmEYW-IAD
5h 03m1 stop
$289Delta
Find Deal
Sat, Nov 1 - Fri, Nov 7
Allegiant Air Logo
8:16 pm - 1:43 pmIAD-EYW
17h 27m1 stop
Allegiant Air Logo
8:45 pm - 8:21 amEYW-IAD
35h 36m2 stops
$299Allegiant Air
Find Deal
Thu, Dec 18 - Wed, Dec 24
Allegiant Air Logo
8:16 pm - 1:43 pmIAD-EYW
17h 27m1 stop
Allegiant Air Logo
3:15 pm - 1:45 pmEYW-IAD
22h 30m2 stops
$316Allegiant Air
Find Deal
Thu, Dec 18 - Tue, Dec 23
Delta Logo
6:00 am - 11:31 amIAD-EYW
5h 31m1 stop
Delta Logo
2:58 pm - 7:27 pmEYW-IAD
4h 29m1 stop
$324Delta
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Tue, Nov 11 - Sat, Nov 15
United Airlines Logo
6:00 am - 2:04 pmIAD-EYW
8h 04m1 stop
United Airlines Logo
3:00 pm - 10:58 pmEYW-IAD
7h 58m1 stop
$331United Airlines
Find Deal
Sat, Nov 15 - Wed, Nov 19
United Airlines Logo
1:00 pm - 4:23 pmIAD-EYW
3h 23mnonstop
United Airlines Logo
1:25 pm - 4:14 pmEYW-IAD
2h 49mnonstop
$344United Airlines
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Thu, Dec 18 - Sun, Dec 21
American Airlines Logo
9:12 am - 3:57 pmIAD-EYW
6h 45m1 stop
American Airlines Logo
1:33 pm - 11:12 pmEYW-IAD
9h 39m2 stops
$374American Airlines
Find Deal
Thu, Jan 1 - Tue, Jan 6

Delta flights from Washington, D.C. Dulles Intl Airport to Key West

Our best Delta deals on Washington, D.C. Dulles Intl Airport to Key West flight tickets
Delta
Nov 1
IAD3:33 pmWashington, D.C. Dulles Intl
4h 33m
1 stop
EYW8:06 pmKey West
Nov 7
EYW6:17 pmKey West
5h 03m
1 stop
IAD11:20 pmWashington, D.C. Dulles Intl
$289
Find similar
Delta
Nov 11
IAD6:00 amWashington, D.C. Dulles Intl
5h 31m
1 stop
EYW11:31 amKey West
Nov 15
EYW2:58 pmKey West
4h 29m
1 stop
IAD7:27 pmWashington, D.C. Dulles Intl
$324
Find similar
Delta
Jan 1
IAD6:00 amWashington, D.C. Dulles Intl
4h 52m
1 stop
EYW10:52 amKey West
Jan 6
EYW6:00 pmKey West
5h 17m
1 stop
IAD11:17 pmWashington, D.C. Dulles Intl
$329
Find similar

Allegiant Air flights from Washington, D.C. Dulles Intl Airport to Key West

Our best Allegiant Air deals on Washington, D.C. Dulles Intl Airport to Key West flight tickets
Allegiant Air
Dec 18
IAD8:16 pmWashington, D.C. Dulles Intl
17h 27m
1 stop
EYW1:43 pmKey West
Dec 24
EYW8:45 pmKey West
35h 36m
2 stops
IAD8:21 amWashington, D.C. Dulles Intl
$299
Find similar
Allegiant Air
Dec 18
IAD8:16 pmWashington, D.C. Dulles Intl
17h 27m
1 stop
EYW1:43 pmKey West
Dec 23
EYW3:15 pmKey West
22h 30m
2 stops
IAD1:45 pmWashington, D.C. Dulles Intl
$316
Find similar
Allegiant Air
Oct 17
IAD4:39 pmWashington, D.C. Dulles Intl
16h 23m
2 stops
EYW9:02 amKey West
Oct 19
EYW12:32 pmKey West
27h 17m
1 stop
IAD3:49 pmWashington, D.C. Dulles Intl
$411
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Washington, D.C. Dulles Intl Airport to Key West 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, momondo users made 832,500 searches. Data last updated October 14, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Key West that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Fri 12/12

3:36 pm-10:07 am

1 stop18h 31m

Key West

Sun 12/14

12:20 pm-12:19 am

2 stops11h 59m

$279

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Thu 11/13

5:34 pm-9:17 am

2 stops15h 43m

Key West

Mon 11/17

10:41 am-4:06 pm

1 stop5h 25m

$281

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Thu 12/4

7:57 pm-1:39 pm

1 stop17h 42m

Key West

Sun 12/7

12:20 pm-12:19 am

2 stops11h 59m

$284

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Sat 11/1

3:33 pm-8:06 pm

1 stop4h 33m

Key West

Fri 11/7

6:17 pm-11:20 pm

1 stop5h 03m

$289

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Thu 12/18

8:16 pm-1:43 pm

1 stop17h 27m

Key West

Wed 12/24

8:45 pm-8:21 am

2 stops35h 36m

$299

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Thu 12/18

8:16 pm-1:43 pm

1 stop17h 27m

Key West

Tue 12/23

3:15 pm-1:45 pm

2 stops22h 30m

$316

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Tue 11/11

6:00 am-11:31 am

1 stop5h 31m

Key West

Sat 11/15

2:58 pm-7:27 pm

1 stop4h 29m

$324

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Sat 11/15

6:00 am-2:04 pm

1 stop8h 04m

Key West

Wed 11/19

3:00 pm-10:58 pm

1 stop7h 58m

$331

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Thu 12/18

1:00 pm-4:23 pm

Nonstop3h 23m

Key West

Sun 12/21

1:25 pm-4:14 pm

Nonstop2h 49m

$344

Washington, D.C.Key West

IAD - EYW

IADEYW

Washington, D.C. Dulles Intl

Thu 1/1

9:12 am-3:57 pm

1 stop6h 45m

Key West

Tue 1/6

1:33 pm-11:12 pm

2 stops9h 39m

$374

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Key West from

How to get the cheapest flight ticket from Washington, D.C. Dulles Intl Airport to Key West

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Key West?

In general, August is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Key West. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $343. If you are unable to visit Key West during the month of August, then departing from Washington, D.C. Dulles Intl Airport during the month July is also very affordable. Most momondo users find prices during this month for around $401.

What is the cheapest day to depart on your flight to Key West?

On average, the least expensive day to fly to Key West from Washington, D.C. Dulles Intl Airport is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $362. However, this price may fluctuate depending on the airline, the season, and holidays. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Washington, D.C. Dulles Intl Airport to Key West for around $526.

What is the cheapest time of day to depart on your flight to Key West?

According to our data, the cheapest time of day to fly to Key West is in the afternoon. momondo users have found flights departing from Washington, D.C. Dulles Intl Airport to Key West in the afternoon for as low as $340. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Key West are more costly in the evening, with an average ticket price of $559. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Washington, D.C. Dulles Intl to Key West flight route?

Fly from Washington, D.C. Dulles Intl to Key West for the best Washington, D.C. Dulles Intl - Key West flight prices

How far in advance should I book a flight to Key West?

You are more likely to see cheaper flights to Key West from Washington, D.C. Dulles Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Key West for around $486 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Key West from Washington, D.C. Dulles Intl Airport for as low as $364 on momondo.

What cabin class options are available on Washington, D.C. Dulles Intl to Key West flights?

There are 2 cabin classes available to choose from on Washington, D.C. Dulles Intl to Key West flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Washington, D.C. Dulles Intl Airport to Key West flights?

No. A direct flight is the cheapest option for a flight between Washington, D.C. Dulles Intl Airport to Key West.

When to book flights from Washington, D.C. Dulles Intl Airport to Key West

Are you open to changing your travel dates? Check out the ideal times to fly from Washington, D.C. Dulles Intl Airport to Key West according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Washington, D.C. Dulles Intl Airport to Key West (IAD to EYW) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Washington, D.C. Dulles Intl Airport to Key West

Best Price Found

$258

Fastest flight time

3h 23m

Direct flights

Every day

Airports in Key West

1 airport
The best one-way flight to Key West from Washington, D.C. Dulles Intl Airport in the past 72 hours is $258. The best round-trip flight deal from Washington, D.C. Dulles Intl Airport to Key West found on momondo in the last 72 hours is $357.
The fastest flight from Washington, D.C. Dulles Intl Airport to Key West takes 3h 23m
Direct flights go from Washington, D.C. Dulles Intl Airport to Key West every day.
There is 1 airport near Key West: Key West (EYW)
Search flight deals

  • How far is Washington, D.C. Dulles Intl to Key West by plane?

    Washington, D.C. Dulles Intl and Key West are 1025.8 mi apart from one another. Flights usually cover this in 3h 23m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Washington, D.C. Dulles Intl Airport to Key West Airport?

    Prices for flights from Washington, D.C. Dulles Intl Airport to Key West Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Washington, D.C. Dulles Intl Airport to Key West Airport?

  • How old do you have to be to fly from Washington, D.C. Dulles Intl Airport to Key West Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Washington, D.C. Dulles Intl Airport to Key West Airport.

  • What documentation or ID do you need to fly to Key West Airport?

    The travel and health documents you'll need for your trip to Key West Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Key West Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Washington, D.C. Dulles Intl Airport to Key West?

  • What is the most popular airline from Washington, D.C. Dulles Intl Airport to Key West?

Best airlines flying from Washington, D.C. Dulles Intl Airport to Key West

Compare and see reviews for airlines that fly from Washington, D.C. Dulles Intl Airport to Key West with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $179Free CancellationRating
7.9
7,973 reviews
Search Delta flights
United AirlinesPriceFrom $249Free CancellationRating
7.4
8,974 reviews
Search United Airlines flights
American AirlinesPriceFrom $354Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights

Traveling to a place near Key West?

Book flights to Key West if you plan to visit one of these locations
Big Pine Key
Little Torch Key

Why use momondo?

Why should I use momondo to find a flight deal from Washington, D.C. to Key West?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Washington, D.C. to Key West for you.

Can I find flights from Washington, D.C. to Key West with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Washington, D.C. to Key West flights to just show those with flexible booking policies.

How can momondo help me find flights from Washington, D.C. to Key West?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Washington, D.C. to Key West.

I’m not ready to book a flight from Washington, D.C. to Key West right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Washington, D.C. to Key West now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Key West and let you know when they change.

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