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Grassy Key

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Grassy Key Flights as Low as $52

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

Spirit Airlines
Wed, Feb 11 - Wed, Feb 18
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$52 Roundtrip, found 10 hours ago
$52
Roundtrip
found 10 hours ago
Select Spirit Airlines flight, departing Wed, Feb 11 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Feb 18, priced at $52 found 10 hours ago
Spirit Airlines
Wed, Feb 11 - Tue, Feb 17
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, Feb 11 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Tue, Feb 17, priced at $53 found 1 hour ago
Spirit Airlines
Tue, Feb 24 - Tue, Mar 3
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$54 Roundtrip, found 13 hours ago
$54
Roundtrip
found 13 hours ago
Select Spirit Airlines flight, departing Tue, Feb 24 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Tue, Mar 3, priced at $54 found 13 hours ago
Frontier Airlines
Wed, Feb 11 - Wed, Feb 18
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$55 Roundtrip, found 10 hours ago
$55
Roundtrip
found 10 hours ago
Select Frontier Airlines flight, departing Wed, Feb 11 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Feb 18, priced at $55 found 10 hours ago
Frontier Airlines
Thu, Feb 26 - Sun, Mar 1
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$56 Roundtrip, just found
$56
Roundtrip
just found
Select Frontier Airlines flight, departing Thu, Feb 26 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sun, Mar 1, priced at $56 just found
Frontier Airlines
Wed, Feb 11 - Tue, Feb 17
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$58 Roundtrip, found 1 hour ago
$58
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Wed, Feb 11 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Tue, Feb 17, priced at $58 found 1 hour ago
Spirit Airlines
Wed, Feb 18 - Wed, Feb 18
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$60 Roundtrip, found 21 hours ago
$60
Roundtrip
found 21 hours ago
Select Spirit Airlines flight, departing Wed, Feb 18 from Newark Liberty Intl. Airport to Miami Intl., returning Wed, Feb 18, priced at $60 found 21 hours ago
American Airlines
Wed, Feb 11 - Wed, Feb 18
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$91 Roundtrip, found 10 hours ago
$91
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Wed, Feb 11 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Feb 18, priced at $91 found 10 hours ago
United
Sat, Feb 28 - Tue, Mar 3
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$117 Roundtrip, found 13 hours ago
$117
Roundtrip
found 13 hours ago
Select United flight, departing Sat, Feb 28 from Newark Liberty Intl. Airport to Miami Intl., returning Tue, Mar 3, priced at $117 found 13 hours ago
Delta
Wed, Feb 11 - Wed, Feb 18
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$117 Roundtrip, found 10 hours ago
$117
Roundtrip
found 10 hours ago
Select Delta flight, departing Wed, Feb 11 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Feb 18, priced at $117 found 10 hours ago
JetBlue Airways
Mon, Feb 9 - Wed, Feb 18
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$211 Roundtrip, found 4 days ago
$211
Roundtrip
found 4 days ago
Select JetBlue Airways flight, departing Mon, Feb 9 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Wed, Feb 18, priced at $211 found 4 days ago
JetBlue Airways
Tue, Mar 3 - Fri, Mar 6
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$214 Roundtrip, found 1 day ago
$214
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Tue, Mar 3 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Fri, Mar 6, priced at $214 found 1 day ago
United
Tue, Sep 15 - Sat, Sep 19
EWR
Newark Liberty Intl. Airport
EYW
Key West Intl.
$229 Roundtrip, found 4 days ago
$229
Roundtrip
found 4 days ago
Select United flight, departing Tue, Sep 15 from Newark Liberty Intl. Airport to Key West Intl., returning Sat, Sep 19, priced at $229 found 4 days ago
Spirit Airlines
Mon, Mar 30 - Wed, Apr 8
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$241 Roundtrip, found 1 day ago
$241
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Mon, Mar 30 from Hartsfield-Jackson Atlanta Intl. to Key West Intl., returning Wed, Apr 8, priced at $241 found 1 day ago
JetBlue Airways
Mon, Mar 9 - Fri, Mar 13
EWR
Newark Liberty Intl. Airport
AVT
Aventura Brightline Train Station
$285 Roundtrip, found 21 hours ago
$285
Roundtrip
found 21 hours ago
Select JetBlue Airways flight, departing Mon, Mar 9 from Newark Liberty Intl. Airport to Aventura Brightline Train Station, returning Fri, Mar 13, priced at $285 found 21 hours ago
JetBlue Airways
Mon, Mar 9 - Fri, Mar 13
EWR
Newark Liberty Intl. Airport
EKW
Miami Central Brightline Train Station
$285 Roundtrip, found 21 hours ago
$285
Roundtrip
found 21 hours ago
Select JetBlue Airways flight, departing Mon, Mar 9 from Newark Liberty Intl. Airport to Miami Central Brightline Train Station, returning Fri, Mar 13, priced at $285 found 21 hours 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 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 $52, 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 $52 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$68

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! (823 reviews)
Great Location Staff was Friendly Would stay there again

Reviewed on Jan 22, 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! (376 reviews)
We did not have breakfast there.

Reviewed on Jan 18, 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! (539 reviews)
I stayed here for one week by myself with my dog. We had a lovely time and thoroughly enjoyed the king suite Sea view room. The room had been recently updated and felt like a small apartment. This area was very safe and extremely dog friendly, the pool was very inviting and the property sits right ...

Reviewed on Jan 13, 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! (1,011 reviews)
The room was spacious, clean, and modern. The pools and pool areas were clean and maintained. The restaurants and cafe had really good food. The EV charging station was very convenient.

Reviewed on Jan 21, 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 ...
9/10 Wonderful! (1,083 reviews)
great resort

Reviewed on Jan 19, 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! (1,133 reviews)
Check-in was a little weird. They checked me into an occupied room. That was sorted out. Everything was perfect rooms were clean, spacious and well maintained.

Reviewed on Jan 18, 2026

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Lime Tree Bay Resort
Tranquility Bay Beachfront Hotel and Resort

Tranquility Bay Beachfront Hotel and Resort

4 out of 5
2600 Overseas Hwy Marathon FL
Book a stay at this beach hotel in Marathon. Enjoy free WiFi, free parking, and 3 outdoor pools. Our guests praise the pool and the helpful staff in our reviews. ...
8.8/10 Excellent! (1,001 reviews)
Clean and comfortable room. Pleasant staff. Nice grounds, beach, and pools.

Reviewed on Jan 20, 2026

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Tranquility Bay Beachfront Hotel and Resort
Fairfield Inn & Suites by Marriott Marathon Florida Keys

Fairfield Inn & Suites by Marriott Marathon Florida Keys

2.5 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 ...
9/10 Wonderful! (1,072 reviews)
Wonderful! Spacious rooms! Great amenities that made for a memorable vacation.

Reviewed on Jan 19, 2026

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Fairfield Inn & Suites by Marriott Marathon Florida Keys
See all 2,305 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.