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Grassy Key

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Grassy Key Flights as Low as $65

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

Spirit Airlines
Thu, Mar 5 - Mon, Mar 9
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$65 Roundtrip, found 21 hours ago
$65
Roundtrip
found 21 hours ago
Select Spirit Airlines flight, departing Thu, Mar 5 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Mon, Mar 9, priced at $65 found 21 hours ago
Frontier Airlines
Wed, Apr 22 - Tue, May 12
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$66 Roundtrip, found 10 hours ago
$66
Roundtrip
found 10 hours ago
Select Frontier Airlines flight, departing Wed, Apr 22 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Tue, May 12, priced at $66 found 10 hours ago
Frontier Airlines
Sun, Mar 8 - Tue, Mar 10
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$67 Roundtrip, found 23 hours ago
$67
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Sun, Mar 8 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Tue, Mar 10, priced at $67 found 23 hours ago
Frontier Airlines
Tue, Mar 3 - Tue, Mar 24
JFK
John F. Kennedy Intl.
MIA
Miami Intl.
$67 Roundtrip, found 4 hours ago
$67
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Tue, Mar 3 from John F. Kennedy Intl. to Miami Intl., returning Tue, Mar 24, priced at $67 found 4 hours ago
Spirit Airlines
Tue, Feb 24 - Sat, Feb 28
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$68 Roundtrip, found 8 hours ago
$68
Roundtrip
found 8 hours ago
Select Spirit Airlines flight, departing Tue, Feb 24 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Feb 28, priced at $68 found 8 hours ago
Frontier Airlines
Fri, Feb 27 - Tue, Mar 3
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$70 Roundtrip, found 1 day ago
$70
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Fri, Feb 27 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Tue, Mar 3, priced at $70 found 1 day ago
Frontier Airlines
Sat, Mar 7 - Thu, Mar 12
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$70 Roundtrip, found 23 hours ago
$70
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Sat, Mar 7 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Thu, Mar 12, priced at $70 found 23 hours ago
American Airlines
Sun, Mar 29 - Wed, Apr 1
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$120 Roundtrip, found 8 hours ago
$120
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Sun, Mar 29 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Apr 1, priced at $120 found 8 hours ago
Delta
Thu, May 7 - Thu, May 28
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$127 Roundtrip, found 10 hours ago
$127
Roundtrip
found 10 hours ago
Select Delta flight, departing Thu, May 7 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Thu, May 28, priced at $127 found 10 hours ago
Spirit Airlines
Thu, Apr 16 - Sun, Apr 19
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$183 Roundtrip, found 4 hours ago
$183
Roundtrip
found 4 hours ago
Select Spirit Airlines flight, departing Thu, Apr 16 from Hartsfield-Jackson Atlanta Intl. to Key West Intl., returning Sun, Apr 19, priced at $183 found 4 hours ago
United
Mon, Mar 2 - Fri, Mar 6
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$217 Roundtrip, found 8 hours ago
$217
Roundtrip
found 8 hours ago
Select United flight, departing Mon, Mar 2 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Fri, Mar 6, priced at $217 found 8 hours ago
JetBlue Airways
Tue, Feb 24 - Tue, Mar 3
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$251 Roundtrip, found 2 days ago
$251
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Tue, Feb 24 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Tue, Mar 3, priced at $251 found 2 days ago
JetBlue Airways
Tue, Feb 24 - Tue, Mar 3
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$251 Roundtrip, found 2 days ago
$251
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Tue, Feb 24 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Tue, Mar 3, priced at $251 found 2 days ago
JetBlue Airways
Wed, Apr 22 - Fri, Jul 31
JFK
John F. Kennedy Intl.
EKW
Miami Central Brightline Train Station
$288 Roundtrip, found 3 days ago
$288
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Wed, Apr 22 from John F. Kennedy Intl. to Miami Central Brightline Train Station, returning Fri, Jul 31, priced at $288 found 3 days ago
American Airlines
Wed, Mar 18 - Tue, Mar 24
JFK
John F. Kennedy Intl.
EYW
Key West Intl.
$309 Roundtrip, found 4 days ago
$309
Roundtrip
found 4 days ago
Select American Airlines flight, departing Wed, Mar 18 from John F. Kennedy Intl. to Key West Intl., returning Tue, Mar 24, priced at $309 found 4 days ago
JetBlue Airways
Tue, May 19 - Sat, May 23
JFK
John F. Kennedy Intl.
AVT
Aventura Brightline Train Station
$312 Roundtrip, found 3 days ago
$312
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Tue, May 19 from John F. Kennedy Intl. to Aventura Brightline Train Station, returning Sat, May 23, priced at $312 found 3 days 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 March, 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 $65, 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 $65 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$65

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 ...
8/10 Very Good! (850 reviews)
The rooms were very clean and the staff was amazing. The restaurant was absolutely wonderful. The staff there was fantastic and the food was fabulous!!!

Reviewed on Feb 8, 2026

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Rainbow Bend Resort
Grassy Flats Resort & Beach Club

Grassy Flats Resort & Beach Club

2.5 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! (393 reviews)
We loved this resort. It is a great location as you can go anywhere to do things in the Keys in an hour or so. Our room was great, and the view from the patio looking through the palm trees was fantastic. The staff was friendly and helpful. The weather turned cold and we were not able to take advantage ...

Reviewed on Feb 9, 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! (548 reviews)
Easy checkin online. Easy access to unit. Very clean. A lot of great amenities on the property that we didnt get to use due to weather.

Reviewed on Jan 30, 2026

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Gulf View Waterfront 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, 5 outdoor pools, and a full-service spa. Our guests praise the pool and the helpful staff in our ...
8/10 Very Good! (1,007 reviews)
The villa was exceptionally clean, though not well equipped (lack of kitchen ware, not salt/pepper). We had difficulty with the WiFi the entire time we were there. The staff were wonderful and friendly. There was streaming services available in the individual room but not in the common area of our ...

Reviewed on Feb 7, 2026

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Hawks Cay Resort
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! (1,171 reviews)
We loved the central location to all of the keys and Long Key State Park was a great stop that was close by.

Reviewed on Feb 11, 2026

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Lime Tree Bay 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 ...
9/10 Wonderful! (1,089 reviews)
Isla Bella did not disappoint. Beautiful room and grounds. The staff went above and beyond and very polite. We will definitely be back.

Reviewed on Feb 7, 2026

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Isla Bella Beach Resort & Spa
Kingsail Resort

Kingsail Resort

2 out of 5
7050 Overseas Highway Marathon FL
Stay at this motel in Marathon. Enjoy free WiFi, free parking, and a marina. Our guests praise the helpful staff and the clean rooms in our reviews. Popular ...
8.4/10 Very Good! (1,020 reviews)
Staff courteous. Room could have used a bit more care. Laundry was inoperable while there.

Reviewed on Feb 7, 2026

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Kingsail Resort
Courtyard by Marriott Faro Blanco Resort

Courtyard by Marriott Faro Blanco Resort

3 out of 5
2146 Overseas Hwy Marathon FL
Book a stay at this beach hotel in Marathon. Enjoy free WiFi, 2 outdoor pools, and a full-service spa. Our guests praise the pool and the helpful staff in our ...
9/10 Wonderful! (1,003 reviews)
Friendly staff. Good food.

Reviewed on Feb 6, 2026

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Courtyard by Marriott Faro Blanco Resort
See all 2,307 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.