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Grassy Key

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Grassy Key Flights as Low as $54

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.
$54 Roundtrip, just found
$54
Roundtrip
just found
Select Spirit Airlines flight, departing Wed, Mar 25 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Mar 28, priced at $54 just found
Spirit Airlines
Wed, Mar 25 - Sat, Mar 28
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$55 Roundtrip, just found
$55
Roundtrip
just found
Select Spirit Airlines flight, departing Wed, Mar 25 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Mar 28, priced at $55 just found
Frontier Airlines
Sat, May 16 - Wed, May 20
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$56 Roundtrip, just found
$56
Roundtrip
just found
Select Frontier Airlines flight, departing Sat, May 16 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, May 20, priced at $56 just found
Frontier Airlines
Sun, Mar 22 - Thu, Mar 26
JFK
John F. Kennedy Intl.
MIA
Miami Intl.
$76 Roundtrip, found 12 hours ago
$76
Roundtrip
found 12 hours ago
Select Frontier Airlines flight, departing Sun, Mar 22 from John F. Kennedy Intl. to Miami Intl., returning Thu, Mar 26, priced at $76 found 12 hours ago
American Airlines
Sat, May 16 - Wed, May 20
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$95 Roundtrip, just found
$95
Roundtrip
just found
Select American Airlines flight, departing Sat, May 16 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, May 20, priced at $95 just found
Spirit Airlines
Sat, Mar 21 - Wed, Apr 8
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$100 Roundtrip, found 2 days ago
$100
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Sat, Mar 21 from Newark Liberty Intl. Airport to Miami Intl., returning Wed, Apr 8, priced at $100 found 2 days ago
Delta
Sat, May 16 - Wed, May 20
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$117 Roundtrip, just found
$117
Roundtrip
just found
Select Delta flight, departing Sat, May 16 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, May 20, priced at $117 just found
Spirit Airlines
Mon, Mar 30 - Wed, Apr 8
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$203 Roundtrip, found 11 hours ago
$203
Roundtrip
found 11 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 $203 found 11 hours ago
JetBlue Airways
Sat, May 2 - Wed, May 6
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$207 Roundtrip, found 6 days ago
$207
Roundtrip
found 6 days ago
Select JetBlue Airways flight, departing Sat, May 2 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Wed, May 6, priced at $207 found 6 days ago
JetBlue Airways
Tue, Mar 17 - Tue, Mar 24
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$235 Roundtrip, found 4 days ago
$235
Roundtrip
found 4 days ago
Select JetBlue Airways flight, departing Tue, Mar 17 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Tue, Mar 24, priced at $235 found 4 days ago
United
Mon, Jun 22 - Thu, Jul 9
EWR
Newark Liberty Intl. Airport
EYW
Key West Intl.
$249 Roundtrip, found 22 hours ago
$249
Roundtrip
found 22 hours ago
Select United flight, departing Mon, Jun 22 from Newark Liberty Intl. Airport to Key West Intl., returning Thu, Jul 9, priced at $249 found 22 hours ago
JetBlue Airways
Sat, Apr 25 - Mon, Aug 3
JFK
John F. Kennedy Intl.
EKW
Miami Central Brightline Train Station
$287 Roundtrip, found 5 days ago
$287
Roundtrip
found 5 days 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 $287 found 5 days ago
JetBlue Airways
Tue, Apr 28 - Wed, May 6
EWR
Newark Liberty Intl. Airport
EKW
Miami Central Brightline Train Station
$297 Roundtrip, found 2 days ago
$297
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Tue, Apr 28 from Newark Liberty Intl. Airport to Miami Central Brightline Train Station, returning Wed, May 6, priced at $297 found 2 days ago
JetBlue Airways
Sat, May 16 - Thu, May 21
EWR
Newark Liberty Intl. Airport
AVT
Aventura Brightline Train Station
$324 Roundtrip, found 4 days ago
$324
Roundtrip
found 4 days ago
Select JetBlue Airways flight, departing Sat, May 16 from Newark Liberty Intl. Airport to Aventura Brightline Train Station, returning Thu, May 21, priced at $324 found 4 days ago
JetBlue Airways
Mon, Sep 21 - Fri, Sep 25
JFK
John F. Kennedy Intl.
AVT
Aventura Brightline Train Station
$331 Roundtrip, just found
$331
Roundtrip
just found
Select JetBlue Airways flight, departing Mon, Sep 21 from John F. Kennedy Intl. to Aventura Brightline Train Station, returning Fri, Sep 25, priced at $331 just found
American Airlines
Tue, Mar 17 - Wed, Mar 25
JFK
John F. Kennedy Intl.
EYW
Key West Intl.
$353 Roundtrip, found 6 days ago
$353
Roundtrip
found 6 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 $353 found 6 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 $54, 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 $54 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$53

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! (872 reviews)
Perfect getaway spot.

Reviewed on Mar 7, 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! (412 reviews)
Yes

Reviewed on Mar 7, 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! (556 reviews)
Nothing but perfect.

Reviewed on Mar 6, 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! (1,014 reviews)
We stayed in a villa. The carpet was dirty, the shower was so small it was hard to turn around, and there was little water pressure until there was none at all, to which they moved us into two rooms in the main hotel. We must've been next to an AC unit or something because it sounded like military ...

Reviewed on Mar 5, 2026

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Hawks Cay 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! (1,101 reviews)
Nice resort,,great staff ,but main restaurant dinnr service is terribly slow and food isnt great ,also cold ,,breakfast food is good ,but takes forever!,,

Reviewed on Mar 5, 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! (1,188 reviews)
Divina at the front desk was truly amazing! She made our stay memorable to say the least! We were originally booked to stay at another hotel night two because we thought they were sold out but she made it happen!!! She’s our girl, go see her!

Reviewed on Mar 8, 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)
Chair in front the desk look like someone went to the bathroom in it and was NEVER cleaned during our week long stay. Plus 20.00 a day to park and 35.00 a day resort fee was nothing but a joke. We won't be back.

Reviewed on Feb 28, 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! (1,036 reviews)
Old school Key West motel, with a nice pool and comfortable, clean rooms. Our room was spotless, and kept clean every day. Free coffee every morning at the outdoor Tiki Hut by the water, and a handy microwave and refrigerator in the room. Everyone we interacted with was friendly, helpful, and welcoming. ...

Reviewed on Mar 5, 2026

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Kingsail Resort
See all 2,297 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.