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Grassy Key

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Grassy Key Flights as Low as $53

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

Spirit Airlines
Wed, Mar 25 - Sat, Mar 28
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$53 Roundtrip, found 1 hour ago
$53
Roundtrip
found 1 hour ago
Select Spirit Airlines flight, departing Wed, Mar 25 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Mar 28, priced at $53 found 1 hour ago
Spirit Airlines
Wed, Mar 25 - Sat, Mar 28
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$55 Roundtrip, found 1 hour ago
$55
Roundtrip
found 1 hour ago
Select Spirit Airlines flight, departing Wed, Mar 25 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Mar 28, priced at $55 found 1 hour ago
Frontier Airlines
Wed, Mar 25 - Sat, Mar 28
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$56 Roundtrip, found 2 hours ago
$56
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Wed, Mar 25 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Mar 28, priced at $56 found 2 hours ago
Frontier Airlines
Mon, Mar 23 - Wed, Apr 1
LGA
LaGuardia
MIA
Miami Intl.
$75 Roundtrip, found 2 days ago
$75
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Mon, Mar 23 from LaGuardia to Miami Intl., returning Wed, Apr 1, priced at $75 found 2 days ago
Frontier Airlines
Mon, Mar 23 - Wed, Mar 25
JFK
John F. Kennedy Intl.
MIA
Miami Intl.
$114 Roundtrip, found 13 hours ago
$114
Roundtrip
found 13 hours ago
Select Frontier Airlines flight, departing Mon, Mar 23 from John F. Kennedy Intl. to Miami Intl., returning Wed, Mar 25, priced at $114 found 13 hours ago
Delta
Tue, Aug 4 - Tue, Aug 18
LGA
LaGuardia
MIA
Miami Intl.
$147 Roundtrip, found 2 days ago
$147
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Aug 4 from LaGuardia to Miami Intl., returning Tue, Aug 18, priced at $147 found 2 days ago
American Airlines
Sat, May 16 - Wed, May 20
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$159 Roundtrip, found 2 hours ago
$159
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Sat, May 16 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, May 20, priced at $159 found 2 hours ago
Spirit Airlines
Mon, Mar 30 - Wed, Apr 8
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$212 Roundtrip, found 3 hours ago
$212
Roundtrip
found 3 hours ago
Select Spirit Airlines flight, departing Mon, Mar 30 from Hartsfield-Jackson Atlanta Intl. to Key West Intl., returning Wed, Apr 8, priced at $212 found 3 hours ago
JetBlue Airways
Tue, May 5 - Wed, May 6
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$230 Roundtrip, found 2 days ago
$230
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Tue, May 5 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Wed, May 6, priced at $230 found 2 days ago
JetBlue Airways
Tue, May 5 - Wed, May 6
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$248 Roundtrip, found 6 days ago
$248
Roundtrip
found 6 days ago
Select JetBlue Airways flight, departing Tue, May 5 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Wed, May 6, priced at $248 found 6 days ago
JetBlue Airways
Sat, Apr 11 - Tue, Apr 21
LGA
LaGuardia
EKW
Miami Central Brightline Train Station
$316 Roundtrip, found 8 hours ago
$316
Roundtrip
found 8 hours ago
Select JetBlue Airways flight, departing Sat, Apr 11 from LaGuardia to Miami Central Brightline Train Station, returning Tue, Apr 21, priced at $316 found 8 hours ago
JetBlue Airways
Sat, Apr 25 - Mon, Aug 3
JFK
John F. Kennedy Intl.
EKW
Miami Central Brightline Train Station
$327 Roundtrip, found 21 hours ago
$327
Roundtrip
found 21 hours ago
Select JetBlue Airways flight, departing Sat, Apr 25 from John F. Kennedy Intl. to Miami Central Brightline Train Station, returning Mon, Aug 3, priced at $327 found 21 hours ago
Spirit Airlines
Wed, Mar 18 - Tue, Mar 24
LGA
LaGuardia
EYW
Key West Intl.
$335 Roundtrip, found 1 day ago
$335
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Wed, Mar 18 from LaGuardia to Key West Intl., returning Tue, Mar 24, priced at $335 found 1 day ago
JetBlue Airways
Mon, Mar 23 - Tue, Mar 24
JFK
John F. Kennedy Intl.
AVT
Aventura Brightline Train Station
$340 Roundtrip, found 5 days ago
$340
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Mon, Mar 23 from John F. Kennedy Intl. to Aventura Brightline Train Station, returning Tue, Mar 24, priced at $340 found 5 days ago
JetBlue Airways
Tue, May 5 - Fri, May 15
LGA
LaGuardia
AVT
Aventura Brightline Train Station
$347 Roundtrip, found 20 hours ago
$347
Roundtrip
found 20 hours ago
Select JetBlue Airways flight, departing Tue, May 5 from LaGuardia to Aventura Brightline Train Station, returning Fri, May 15, priced at $347 found 20 hours ago
American Airlines
Tue, Mar 17 - Wed, Mar 25
JFK
John F. Kennedy Intl.
EYW
Key West Intl.
$435 Roundtrip, found 2 days ago
$435
Roundtrip
found 2 days ago
Select American Airlines flight, departing Tue, Mar 17 from John F. Kennedy Intl. to Key West Intl., returning Wed, Mar 25, priced at $435 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 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 $53, 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 $53 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$52

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! (878 reviews)
The place was nice but has some spots that could Have a little updating. Over all was a good place to stay. Beach and rooms were clean. Pool was nice. Hot tub was nice and hot but the jets were a little aggressive’. Have to be watching for the sign our you will miss it. Lots of trees on both ...

Reviewed on Mar 11, 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! (415 reviews)
Beautiful ocean view from our lovely room. Wonderful balcony and facilities.

Reviewed on Mar 11, 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! (559 reviews)
Pretty spot and very clean but they need more comfy chairs out by the water and grounds. Also if we had access to ice after 6:00 pm that would be nice or just ice trays in the fridge would be great! All in all a great quiet and safe place to stay!

Reviewed on Mar 8, 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! (1,097 reviews)
All rooms have an ocean view-beautiful for sure!

Reviewed on Mar 9, 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! (1,018 reviews)
Beautiful property with amazing pools. Restaurants were fabulous. Would definitely stay again.

Reviewed on Mar 12, 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! (1,197 reviews)
We had a wonderful time at Lime Tree. Couldn’t have asked for more perfect place. Great staff, super clean, The views were spectacular. will stay again and recommend to others who travel here. Go ahead and book Lime Tree wont disappoint!!

Reviewed on Mar 12, 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! (1,001 reviews)
Overall, we had an okay stay. Would have been nice if we were not charged $5 for water, $20 for parking every day, and the extra $35 every day for resort fee! Also, would have appreciated a refrigerator big enough to actually hold our leftovers not just the wine bottles for sale. Lastly, the 2 beach ...

Reviewed on Mar 12, 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! (1,027 reviews)
Pleasant quiet stay.

Reviewed on Mar 12, 2026

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Kingsail Resort
See all 2,293 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.