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Grassy Key

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Grassy Key Flights as Low as $78

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

Frontier Airlines
Tue, Feb 16 - Tue, Feb 23
DTW
Detroit Metropolitan Wayne County
MIA
Miami Intl.
$78 Roundtrip, found 3 hours ago
$78
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Tue, Feb 16 from Detroit Metropolitan Wayne County to Miami Intl., returning Tue, Feb 23, priced at $78 found 3 hours ago
Southwest Airlines
Tue, Feb 9 - Wed, Feb 17
CMH
John Glenn Columbus Intl.
MIA
Miami Intl.
$167 Roundtrip, found 3 hours ago
$167
Roundtrip
found 3 hours ago
Select Southwest Airlines flight, departing Tue, Feb 9 from John Glenn Columbus Intl. to Miami Intl., returning Wed, Feb 17, priced at $167 found 3 hours ago
Delta
Tue, Feb 9 - Wed, Feb 17
CMH
John Glenn Columbus Intl.
MIA
Miami Intl.
$197 Roundtrip, found 3 hours ago
$197
Roundtrip
found 3 hours ago
Select Delta flight, departing Tue, Feb 9 from John Glenn Columbus Intl. to Miami Intl., returning Wed, Feb 17, priced at $197 found 3 hours ago
United
Tue, Feb 16 - Tue, Feb 23
DTW
Detroit Metropolitan Wayne County
MIA
Miami Intl.
$217 Roundtrip, found 3 hours ago
$217
Roundtrip
found 3 hours ago
Select United flight, departing Tue, Feb 16 from Detroit Metropolitan Wayne County to Miami Intl., returning Tue, Feb 23, priced at $217 found 3 hours ago
Delta
Tue, Jan 19 - Tue, Feb 9
BOS
Logan Intl.
MIA
Miami Intl.
$219 Roundtrip, just found
$219
Roundtrip
just found
Select Delta flight, departing Tue, Jan 19 from Logan Intl. to Miami Intl., returning Tue, Feb 9, priced at $219 just found
JetBlue Airways
Tue, Dec 1 - Sat, Dec 5
CMH
John Glenn Columbus Intl.
AVT
Aventura Brightline Train Station
$242 Roundtrip, found 3 days ago
$242
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Tue, Dec 1 from John Glenn Columbus Intl. to Aventura Brightline Train Station, returning Sat, Dec 5, priced at $242 found 3 days ago
American Airlines
Tue, Feb 16 - Sat, Feb 20
CMH
John Glenn Columbus Intl.
MIA
Miami Intl.
$257 Roundtrip, found 3 hours ago
$257
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Tue, Feb 16 from John Glenn Columbus Intl. to Miami Intl., returning Sat, Feb 20, priced at $257 found 3 hours ago
Bargain Flight
Tue, Dec 8 - Tue, Dec 22
CMH
John Glenn Columbus Intl.
EYW
Key West Intl.
$303 Roundtrip, found 7 hours ago
$303
Roundtrip
found 7 hours ago
Select Bargain Flight flight, departing Tue, Dec 8 from John Glenn Columbus Intl. to Key West Intl., returning Tue, Dec 22, priced at $303 found 7 hours ago
Bargain Flight
Sun, Dec 6 - Fri, Dec 18
BOS
Logan Intl.
EYW
Key West Intl.
$311 Roundtrip, found 3 hours ago
$311
Roundtrip
found 3 hours ago
Select Bargain Flight flight, departing Sun, Dec 6 from Logan Intl. to Key West Intl., returning Fri, Dec 18, priced at $311 found 3 hours ago
JetBlue Airways
Fri, Nov 27 - Wed, Dec 2
CMH
John Glenn Columbus Intl.
EKW
Miami Central Brightline Train Station
$336 Roundtrip, found 3 days ago
$336
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Fri, Nov 27 from John Glenn Columbus Intl. to Miami Central Brightline Train Station, returning Wed, Dec 2, priced at $336 found 3 days ago
JetBlue Airways
Sun, Dec 13 - Sun, Dec 20
DTW
Detroit Metropolitan Wayne County
AVT
Aventura Brightline Train Station
$369 Roundtrip, found 6 days ago
$369
Roundtrip
found 6 days ago
Select JetBlue Airways flight, departing Sun, Dec 13 from Detroit Metropolitan Wayne County to Aventura Brightline Train Station, returning Sun, Dec 20, priced at $369 found 6 days ago
JetBlue Airways
Sun, Dec 13 - Sun, Dec 20
DTW
Detroit Metropolitan Wayne County
EKW
Miami Central Brightline Train Station
$369 Roundtrip, found 6 days ago
$369
Roundtrip
found 6 days ago
Select JetBlue Airways flight, departing Sun, Dec 13 from Detroit Metropolitan Wayne County to Miami Central Brightline Train Station, returning Sun, Dec 20, priced at $369 found 6 days ago
JetBlue Airways
Tue, Dec 1 - Wed, Dec 2
BOS
Logan Intl.
EYW
Key West Intl.
$387 Roundtrip, found 3 hours ago
$387
Roundtrip
found 3 hours ago
Select JetBlue Airways flight, departing Tue, Dec 1 from Logan Intl. to Key West Intl., returning Wed, Dec 2, priced at $387 found 3 hours ago
United
Tue, Dec 15 - Tue, Dec 22
DTW
Detroit Metropolitan Wayne County
EYW
Key West Intl.
$400 Roundtrip, found 7 hours ago
$400
Roundtrip
found 7 hours ago
Select United flight, departing Tue, Dec 15 from Detroit Metropolitan Wayne County to Key West Intl., returning Tue, Dec 22, priced at $400 found 7 hours ago
JetBlue Airways
Sat, Dec 5 - Sat, Dec 12
BOS
Logan Intl.
AVT
Aventura Brightline Train Station
$442 Roundtrip, found 2 days ago
$442
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Sat, Dec 5 from Logan Intl. to Aventura Brightline Train Station, returning Sat, Dec 12, priced at $442 found 2 days ago
JetBlue Airways
Sat, Dec 5 - Sat, Dec 12
BOS
Logan Intl.
EKW
Miami Central Brightline Train Station
$442 Roundtrip, found 2 days ago
$442
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Sat, Dec 5 from Logan Intl. to Miami Central Brightline Train Station, returning Sat, Dec 12, priced at $442 found 2 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 February, 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 14 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 Key West Intl. 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 $78, 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 $78 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$78

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 free breakfast, free WiFi, and free parking. Our guests praise the breakfast and the helpful staff in our ...
Get rates
Rainbow Bend Resort
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! (646 reviews)
"I had an extremely frustrating and concerning stay at this property. Upon arrival, the front desk was completely unattended with no staff on-site, no late check-in instructions provided, and no clear emergency contact number posted. Getting basic assistance or access was an unnecessarily difficult ..."

Reviewed on Nov 15, 2026

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Gulf View Waterfront 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! (507 reviews)
"Paradise! The room was exceptionally clean and the staff was very helpful and absolutely wonderful. The location is great with access to an on-property restaurant and bars. The access to other local restaurants and bars is also a plus. I will be back and recommend the stay to anyone!"

Reviewed on Nov 14, 2026

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Grassy Flats Resort & Beach Club
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! (1,305 reviews)
"The rooms are large, comfortable and airy. The bed was comfortable and we slept quite well. ALL rooms face the ocean. The breezes on the balcony were fabulous! Of note, the AC cuts off if the balcony door doesn't close completely. The property is well-maintained and one feels at peace. The spa experience ..."

Reviewed on Nov 14, 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. ...
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Lime Tree Bay 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 ...
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Fairfield Inn & Suites by Marriott 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 ...
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Kingsail 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 ...
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Hawks Cay Resort
See all 2,344 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.