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Grassy Key

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Grassy Key Flights as Low as $56

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

Frontier Airlines
Tue, Apr 21 - Sat, Apr 25
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$56 Roundtrip, found 4 hours ago
$56
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Tue, Apr 21 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Apr 25, priced at $56 found 4 hours ago
Frontier Airlines
Tue, Apr 21 - Sat, Apr 25
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$58 Roundtrip, found 4 hours ago
$58
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Tue, Apr 21 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Apr 25, priced at $58 found 4 hours ago
Spirit Airlines
Tue, Apr 21 - Sat, Apr 25
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$59 Roundtrip, found 4 hours ago
$59
Roundtrip
found 4 hours ago
Select Spirit Airlines flight, departing Tue, Apr 21 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Apr 25, priced at $59 found 4 hours ago
Spirit Airlines
Mon, Apr 20 - Wed, Apr 22
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$92 Roundtrip, found 8 hours ago
$92
Roundtrip
found 8 hours ago
Select Spirit Airlines flight, departing Mon, Apr 20 from Newark Liberty Intl. Airport to Miami Intl., returning Wed, Apr 22, priced at $92 found 8 hours ago
Frontier Airlines
Sun, Apr 12 - Fri, Apr 17
IAD
Washington Dulles Intl.
MIA
Miami Intl.
$103 Roundtrip, found 4 days ago
$103
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sun, Apr 12 from Washington Dulles Intl. to Miami Intl., returning Fri, Apr 17, priced at $103 found 4 days ago
Delta
Tue, Jun 30 - Thu, Jul 9
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$139 Roundtrip, found 13 hours ago
$139
Roundtrip
found 13 hours ago
Select Delta flight, departing Tue, Jun 30 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Thu, Jul 9, priced at $139 found 13 hours ago
American Airlines
Tue, Jun 30 - Thu, Jul 9
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$139 Roundtrip, found 13 hours ago
$139
Roundtrip
found 13 hours ago
Select American Airlines flight, departing Tue, Jun 30 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Thu, Jul 9, priced at $139 found 13 hours ago
United
Sat, May 2 - Tue, May 5
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$184 Roundtrip, found 8 hours ago
$184
Roundtrip
found 8 hours ago
Select United flight, departing Sat, May 2 from Newark Liberty Intl. Airport to Miami Intl., returning Tue, May 5, priced at $184 found 8 hours ago
Spirit Airlines
Mon, Apr 20 - Fri, Apr 24
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$235 Roundtrip, found 21 hours ago
$235
Roundtrip
found 21 hours ago
Select Spirit Airlines flight, departing Mon, Apr 20 from Hartsfield-Jackson Atlanta Intl. to Key West Intl., returning Fri, Apr 24, priced at $235 found 21 hours ago
JetBlue Airways
Wed, Apr 29 - Thu, May 14
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$270 Roundtrip, found 5 days ago
$270
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Wed, Apr 29 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Thu, May 14, priced at $270 found 5 days ago
JetBlue Airways
Sat, Apr 18 - Wed, Apr 22
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$279 Roundtrip, found 5 days ago
$279
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Sat, Apr 18 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Wed, Apr 22, priced at $279 found 5 days ago
Delta
Mon, Jul 13 - Thu, Jul 30
IAD
Washington Dulles Intl.
EYW
Key West Intl.
$309 Roundtrip, found 14 hours ago
$309
Roundtrip
found 14 hours ago
Select Delta flight, departing Mon, Jul 13 from Washington Dulles Intl. to Key West Intl., returning Thu, Jul 30, priced at $309 found 14 hours ago
Delta
Wed, Aug 26 - Wed, Sep 2
EWR
Newark Liberty Intl. Airport
EYW
Key West Intl.
$309 Roundtrip, found 3 hours ago
$309
Roundtrip
found 3 hours ago
Select Delta flight, departing Wed, Aug 26 from Newark Liberty Intl. Airport to Key West Intl., returning Wed, Sep 2, priced at $309 found 3 hours ago
JetBlue Airways
Thu, Nov 19 - Sun, Dec 6
EWR
Newark Liberty Intl. Airport
EKW
Miami Central Brightline Train Station
$367 Roundtrip, found 1 day ago
$367
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Thu, Nov 19 from Newark Liberty Intl. Airport to Miami Central Brightline Train Station, returning Sun, Dec 6, priced at $367 found 1 day ago
JetBlue Airways
Tue, Apr 28 - Fri, May 1
EWR
Newark Liberty Intl. Airport
AVT
Aventura Brightline Train Station
$388 Roundtrip, found 2 days ago
$388
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Tue, Apr 28 from Newark Liberty Intl. Airport to Aventura Brightline Train Station, returning Fri, May 1, priced at $388 found 2 days ago
United
Thu, Apr 16 - Mon, Apr 20
IAD
Washington Dulles Intl.
EKW
Miami Central Brightline Train Station
$763 Roundtrip, found 5 days ago
$763
Roundtrip
found 5 days ago
Select United flight, departing Thu, Apr 16 from Washington Dulles Intl. to Miami Central Brightline Train Station, returning Mon, Apr 20, priced at $763 found 5 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 April, 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 $56, 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 $56 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$56

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! (899 reviews)
We enjoyed our visit here. The best part was the lounge chairs - as they had arm rests. The pool was enjoyable. The rooms were sufficient - although we could hear someone snoring from another room. The bathroom was remodeled and

Reviewed on Mar 30, 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! (421 reviews)
The pool and pool area was nice. We liked how there was a separate adult pool from the kids pool. Also, the room was clean and had clean towels everyday. But, they allow dogs which was not a pleasant experience. Yipey dogs during the day & night was very disturbing and annoying.

Reviewed on Mar 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! (562 reviews)
It is a cute little place to stay. We enjoyed the pool, outdoor games and relaxed on the little beach area

Reviewed on Mar 19, 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! (1,113 reviews)
Beautiful property and staff that goes out of their way to provide an amazing experience. Don’t expect a swimming beach, but plenty of room for chairs by the water or the multiple pools. Shanda at the sushi bar went above and beyond to accommodate our group and the sushi was delicious. Mahina was ...

Reviewed on Mar 28, 2026

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Isla Bella Beach Resort & Spa
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! (1,010 reviews)
They dont strive to serve. Our room had a sliding bathroom door that did not lock or remain closed. It took them 3 days to fix it. The last day, the entire floor smelled fish. They sprayed copious amounts of air freshener but it didnt help. Overall, its a nice place with great views and amenities ...

Reviewed on Mar 31, 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! (1,211 reviews)
The room was spacious and had a feather bed that was almost too soft. A/C was good, and we really liked having a ceiling fan too. Shower was huge! But not a shelf or place to put a bar of soap or hang a washcloth. The laminate floors were very dirty, which we didn't notice until after taking showers ...

Reviewed on Mar 30, 2026

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Lime Tree Bay Resort
Courtyard by Marriott Faro Blanco Resort, Marathon Florida Keys

Courtyard by Marriott Faro Blanco Resort, Marathon Florida Keys

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 beach locale. Our guests praise the pool and the helpful staff in our reviews. ...
9/10 Wonderful! (1,000 reviews)
My best experience there was the pool area. The rooms were not that great for the price I paid. The carpet seemed dirty and the AC did not work well. The staff was excellent. I was on a family vacation, hoping to get my kids off my back for a few hours;however, they had a game room many of the amenities ...

Reviewed on Mar 23, 2026

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Courtyard by Marriott Faro Blanco Resort, Marathon Florida Keys
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 ...
8.6/10 Excellent! (1,032 reviews)
My review is against Charlotte the “manager” I brought up the pet fee as it’s specified on the website as per stay per night but, I was charge per dog. She mention changing the verbiage & adjusting the fee. However, she charge me the full amount. She didn’t provided a receipt. Just un-trust worthy. ...

Reviewed on Mar 30, 2026

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Kingsail Resort
See all 2,196 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.