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Grassy Key

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Grassy Key Flights as Low as $85

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Frontier Airlines
Sun, Jul 26 - Thu, Jul 30
CLE
Hopkins Intl.
MIA
Miami Intl.
$85 Roundtrip, found 9 hours ago
$85
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sun, Jul 26 from Hopkins Intl. to Miami Intl., returning Thu, Jul 30, priced at $85 found 9 hours ago
Frontier Airlines
Sun, Jul 26 - Thu, Aug 6
CLE
Hopkins Intl.
MIA
Miami Intl.
$90 Roundtrip, found 4 days ago
$90
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sun, Jul 26 from Hopkins Intl. to Miami Intl., returning Thu, Aug 6, priced at $90 found 4 days ago
Frontier Airlines
Sun, Jul 26 - Thu, Jul 30
CLE
Hopkins Intl.
MIA
Miami Intl.
$96 Roundtrip, found 9 hours ago
$96
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sun, Jul 26 from Hopkins Intl. to Miami Intl., returning Thu, Jul 30, priced at $96 found 9 hours ago
Frontier Airlines
Wed, Jul 29 - Thu, Aug 20
PHL
Philadelphia Intl.
MIA
Miami Intl.
$125 Roundtrip, found 15 hours ago
$125
Roundtrip
found 15 hours ago
Select Frontier Airlines flight, departing Wed, Jul 29 from Philadelphia Intl. to Miami Intl., returning Thu, Aug 20, priced at $125 found 15 hours ago
Frontier Airlines
Tue, Jun 30 - Tue, Jul 21
DEN
Denver Intl.
MIA
Miami Intl.
$213 Roundtrip, found 5 days ago
$213
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Tue, Jun 30 from Denver Intl. to Miami Intl., returning Tue, Jul 21, priced at $213 found 5 days ago
American Airlines
Mon, Nov 2 - Fri, Nov 13
CLE
Hopkins Intl.
MIA
Miami Intl.
$227 Roundtrip, found 4 hours ago
$227
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Mon, Nov 2 from Hopkins Intl. to Miami Intl., returning Fri, Nov 13, priced at $227 found 4 hours ago
Delta
Tue, Nov 3 - Sat, Nov 14
CLE
Hopkins Intl.
MIA
Miami Intl.
$247 Roundtrip, found 4 hours ago
$247
Roundtrip
found 4 hours ago
Select Delta flight, departing Tue, Nov 3 from Hopkins Intl. to Miami Intl., returning Sat, Nov 14, priced at $247 found 4 hours ago
United
Mon, Nov 2 - Fri, Nov 13
CLE
Hopkins Intl.
MIA
Miami Intl.
$247 Roundtrip, found 4 hours ago
$247
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Nov 2 from Hopkins Intl. to Miami Intl., returning Fri, Nov 13, priced at $247 found 4 hours ago
Delta
Tue, Oct 6 - Tue, Oct 20
CLE
Hopkins Intl.
EYW
Key West Intl.
$285 Roundtrip, found 13 hours ago
$285
Roundtrip
found 13 hours ago
Select Delta flight, departing Tue, Oct 6 from Hopkins Intl. to Key West Intl., returning Tue, Oct 20, priced at $285 found 13 hours ago
United
Tue, Jan 5 - Tue, Jan 12
DEN
Denver Intl.
EYW
Key West Intl.
$312 Roundtrip, just found
$312
Roundtrip
just found
Select United flight, departing Tue, Jan 5 from Denver Intl. to Key West Intl., returning Tue, Jan 12, priced at $312 just found
JetBlue Airways
Thu, Jul 30 - Mon, Aug 3
CLE
Hopkins Intl.
AVT
Aventura Brightline Train Station
$371 Roundtrip, found 1 day ago
$371
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Thu, Jul 30 from Hopkins Intl. to Aventura Brightline Train Station, returning Mon, Aug 3, priced at $371 found 1 day ago
JetBlue Airways
Thu, Jul 30 - Mon, Aug 3
CLE
Hopkins Intl.
EKW
Miami Central Brightline Train Station
$371 Roundtrip, found 1 day ago
$371
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Thu, Jul 30 from Hopkins Intl. to Miami Central Brightline Train Station, returning Mon, Aug 3, priced at $371 found 1 day ago
American Airlines
Tue, Aug 18 - Sat, Aug 29
TTN
Mercer
MIA
Miami Intl.
$397 Roundtrip, found 23 hours ago
$397
Roundtrip
found 23 hours ago
Select American Airlines flight, departing Tue, Aug 18 from Mercer to Miami Intl., returning Sat, Aug 29, priced at $397 found 23 hours ago
JetBlue Airways
Tue, Dec 1 - Sat, Dec 12
PHL
Philadelphia Intl.
EKW
Miami Central Brightline Train Station
$430 Roundtrip, found 1 day ago
$430
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Tue, Dec 1 from Philadelphia Intl. to Miami Central Brightline Train Station, returning Sat, Dec 12, priced at $430 found 1 day ago
JetBlue Airways
Tue, Aug 18 - Tue, Aug 25
PHL
Philadelphia Intl.
AVT
Aventura Brightline Train Station
$431 Roundtrip, found 1 day ago
$431
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Tue, Aug 18 from Philadelphia Intl. to Aventura Brightline Train Station, returning Tue, Aug 25, priced at $431 found 1 day ago
American Airlines
Tue, Jun 30 - Sat, Jul 4
PHL
Philadelphia Intl.
EYW
Key West Intl.
$505 Roundtrip, found 15 hours ago
$505
Roundtrip
found 15 hours ago
Select American Airlines flight, departing Tue, Jun 30 from Philadelphia Intl. to Key West Intl., returning Sat, Jul 4, priced at $505 found 15 hours ago

Cheap Flights to Grassy Key

Fall in love at first flight with your vacation to Grassy Key by saving a ton of cash on your last-minute cheap flight. There’s no more scouring the internet for a good deal—book your flight to Grassy Key on Hotwire, and you’ll be up, up, and on a getaway in no time.

Because once the wheels are down in Grassy Key, the good times start rolling. So buckle up, you’re in for a fun ride.

Frequently Asked Questions About flights to Grassy Key

Don’t waste your time on endless searches for cheap airline tickets oneway or roundtrip. We’ll have you on your way to Grassy Key with a tiny bag of pretzels in your hand before you can say “tray tables in the upright position”—and for a ticket price that works for your vacay budget.

So all you have to worry about is where you’re headed after the MIA airport.

What is the cheapest month to fly to Grassy Key?

Airline ticket prices fluctuate all the time, depending on the day of the week or the month of the year. The cheapest round trip flights to Grassy Key are in July, but when you book your flight on Hotwire, savings are always in season.

How many airlines fly to Grassy Key?

Variety is the spice of life, even when it comes to booking your next trip. Want options for airlines? You’ll find 16 to choose from for your flight to Grassy Key.

What airport is best to fly into Grassy Key?

When you’re planning your trip to Grassy Key, convenience is the name of the game. Luckily, Grassy Key Florida Keys Marathon Airport is nearby so you can deplane and get going on checking off everything on your Grassy Key must-do list.

How much are flights to Grassy Key?

Got very cheap flights on your vacation itinerary? When you book your airline tickets to Grassy Key on Hotwire, you may just get what’s on your getaway wish list. With tickets as low as $85, you’ll have leftover cash for at least a magazine and a bottle of water at the airport book store.

How to get cheap flights to Grassy Key?

The trick to saving a stack of cash on your flight to Grassy Key? Snatch up that Hotwire flight deal when you see a killer rate because it could be gone in a flash. And with flights as low as $85 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$85

Last Minute Hotel Deals in Grassy Key

Rainbow Bend Resort

Rainbow Bend Resort

2.5 out of 5
57784 Overseas Hwy Marathon FL
Book a stay at this beach hotel in Marathon. Enjoy a private beach, daily housekeeping, and a garden. Our guests praise the breakfast and the helpful staff in ...
8.2/10 Very Good! (1,000 reviews)
"This is not the time to travel.The beach is covered with seaweeds.The smell is horrible.It enters the room.I am allergic to iodine and was coughing and with a sore throat.Could not use the kayaks because did not want to enter the contaminated water."

Reviewed on Jun 24, 2026

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Rainbow Bend Resort
Grassy Flats Resort & Beach Club

Grassy Flats Resort & Beach Club

4 out of 5
58182 Overseas Hwy Marathon FL
Stay at this hotel in Marathon. Enjoy free WiFi, free parking, and 2 outdoor pools. Our guests praise the helpful staff and the property condition in our reviews. ...
9.4/10 Exceptional! (463 reviews)
"Tv Remote didn’t work. Phone didn’t work. As a solo traveler didnt love that I couldnt reach the front desk. Calling from a cell phone, rang and rang then hung up. Had to go down to the front desk for anything needed. Beach amenities were non-existent. Restaurant completely ignored me when seated ..."

Reviewed on Jun 26, 2026

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Grassy Flats Resort & Beach Club
Gulf View Waterfront Resort

Gulf View Waterfront Resort

2.5 out of 5
58743 OVERSEAS HWY Marathon FL
Stay at this hotel in Marathon. Enjoy free WiFi, free parking, and daily housekeeping. Our guests praise the helpful staff and the clean rooms in our reviews. ...
8.4/10 Very Good! (589 reviews)
"Love it"

Reviewed on Jun 26, 2026

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Gulf View Waterfront Resort
Isla Bella Beach Resort & Spa

Isla Bella Beach Resort & Spa

5 out of 5
1 Knights Key Boulevard Marathon FL
Book a stay at this luxury hotel in Marathon. Enjoy free WiFi, 5 outdoor pools, and a full-service spa. Our guests praise the pool and the helpful staff in our ...
9.2/10 Wonderful! (1,175 reviews)
"The grounds were lush and serene with 5 beautiful pools, white sand and colorful flowers. The rooms were impeccable with an amazing view from the balcony. 20/10 recommendation!"

Reviewed on Jun 26, 2026

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Isla Bella Beach Resort & Spa
Lime Tree Bay Resort

Lime Tree Bay Resort

3.5 out of 5
68500 Overseas Hwy Long Key FL
Book a stay at this beach resort in Long Key. Enjoy free WiFi, free parking, and 3 outdoor pools. Our guests praise the pool and the helpful staff in our reviews. ...
9.2/10 Wonderful! (1,340 reviews)
"."

Reviewed on Jun 26, 2026

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Lime Tree Bay Resort
Hawks Cay Resort

Hawks Cay Resort

4 out of 5
61 Hawks Cay Blvd Marathon FL
Book a stay at this luxury hotel in Marathon. Enjoy free WiFi, 3 outdoor pools, and a full-service spa. Our guests praise the pool and the helpful staff in our ...
8.2/10 Very Good! (1,001 reviews)
"The property is good but the rooms need to be upkept better. We rented three rooms and one of them smelled pretty bad like a wet smell the other room drain was not working too good. We found the breakfast extremely bad, expensive and with little offerings. The pool area bar and lobby were nice and ..."

Reviewed on Jun 26, 2026

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Hawks Cay Resort
Fairfield Inn & Suites by Marriott Marathon Florida Keys

Fairfield Inn & Suites by Marriott Marathon Florida Keys

3 out of 5
13201 Overseas Hwy Marathon FL
Book a stay at this business-friendly hotel in Marathon. Enjoy free breakfast, free WiFi, and 2 outdoor pools. Our guests praise the breakfast and the restaurant ...
9.2/10 Wonderful! (1,163 reviews)
"Front desk staff was amazing, the pool was perfect and food so delicious in walking distance"

Reviewed on Jun 26, 2026

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Fairfield Inn & Suites by Marriott Marathon Florida Keys
Faro Blanco Resort Marathon Florida Keys, Curio by Hilton

Faro Blanco Resort Marathon Florida Keys, Curio by Hilton

4 out of 5
1996 Overseas Highway Marathon FL
Book a stay at this spa resort in Marathon. Enjoy free WiFi, 4 outdoor pools, and a full-service spa. Our guests praise the pool and the restaurant in our reviews. ...
8.6/10 Excellent! (1,163 reviews)
"The room and dining were very good. Unfortunately a 20 to 30 people showed up at the pool with a boom box and coolers and were celebrating Fathers Day by eating cake and food in the pool along with the 5 or 6 unsupervised children jumping in and out of the pool. I know never to stay at this resort ..."

Reviewed on Jun 25, 2026

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Faro Blanco Resort Marathon Florida Keys, Curio by Hilton
See all 2,381 properties in Grassy Key
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.