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Grassy Key

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Grassy Key Flights as Low as $118

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

Frontier Airlines
Fri, Oct 23 - Mon, Oct 26
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$118 Roundtrip, just found
$118
Roundtrip
just found
Select Frontier Airlines flight, departing Fri, Oct 23 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Mon, Oct 26, priced at $118 just found
Frontier Airlines
Tue, Aug 18 - Sat, Aug 29
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$128 Roundtrip, found 2 hours ago
$128
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Tue, Aug 18 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Aug 29, priced at $128 found 2 hours ago
Frontier Airlines
Wed, Jul 15 - Mon, Jul 20
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$131 Roundtrip, found 7 hours ago
$131
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Wed, Jul 15 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Mon, Jul 20, priced at $131 found 7 hours ago
Frontier Airlines
Thu, Jul 9 - Sun, Jul 12
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$138 Roundtrip, found 1 day ago
$138
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Thu, Jul 9 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sun, Jul 12, priced at $138 found 1 day ago
Frontier Airlines
Thu, Sep 17 - Wed, Sep 23
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$138 Roundtrip, found 21 hours ago
$138
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Thu, Sep 17 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Sep 23, priced at $138 found 21 hours ago
Frontier Airlines
Wed, Aug 19 - Fri, Sep 4
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$139 Roundtrip, found 22 hours ago
$139
Roundtrip
found 22 hours ago
Select Frontier Airlines flight, departing Wed, Aug 19 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Fri, Sep 4, priced at $139 found 22 hours ago
Frontier Airlines
Mon, Jul 27 - Mon, Jul 27
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$141 Roundtrip, found 3 days ago
$141
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Mon, Jul 27 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Mon, Jul 27, priced at $141 found 3 days ago
Delta
Fri, Oct 23 - Mon, Oct 26
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$169 Roundtrip, just found
$169
Roundtrip
just found
Select Delta flight, departing Fri, Oct 23 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Mon, Oct 26, priced at $169 just found
American Airlines
Tue, Aug 18 - Sat, Aug 29
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$169 Roundtrip, found 2 hours ago
$169
Roundtrip
found 2 hours ago
Select American Airlines flight, departing Tue, Aug 18 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Aug 29, priced at $169 found 2 hours ago
United
Tue, Sep 15 - Tue, Oct 6
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$187 Roundtrip, found 16 hours ago
$187
Roundtrip
found 16 hours ago
Select United flight, departing Tue, Sep 15 from Newark Liberty Intl. Airport to Miami Intl., returning Tue, Oct 6, priced at $187 found 16 hours ago
JetBlue Airways
Mon, Oct 12 - Thu, Oct 15
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$289 Roundtrip, found 5 days ago
$289
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Mon, Oct 12 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Thu, Oct 15, priced at $289 found 5 days ago
JetBlue Airways
Mon, Oct 12 - Thu, Oct 15
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$289 Roundtrip, found 5 days ago
$289
Roundtrip
found 5 days ago
Select JetBlue Airways flight, departing Mon, Oct 12 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Thu, Oct 15, priced at $289 found 5 days ago
United
Sun, Nov 8 - Wed, Nov 25
EWR
Newark Liberty Intl. Airport
EYW
Key West Intl.
$289 Roundtrip, found 5 days ago
$289
Roundtrip
found 5 days ago
Select United flight, departing Sun, Nov 8 from Newark Liberty Intl. Airport to Key West Intl., returning Wed, Nov 25, priced at $289 found 5 days ago
Delta
Sun, Jul 12 - Tue, Jul 21
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$349 Roundtrip, found 2 hours ago
$349
Roundtrip
found 2 hours ago
Select Delta flight, departing Sun, Jul 12 from Hartsfield-Jackson Atlanta Intl. to Key West Intl., returning Tue, Jul 21, priced at $349 found 2 hours ago
JetBlue Airways
Fri, Aug 28 - Fri, Sep 11
EWR
Newark Liberty Intl. Airport
EKW
Miami Central Brightline Train Station
$350 Roundtrip, found 2 days ago
$350
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Fri, Aug 28 from Newark Liberty Intl. Airport to Miami Central Brightline Train Station, returning Fri, Sep 11, priced at $350 found 2 days ago
JetBlue Airways
Tue, Sep 15 - Tue, Oct 6
EWR
Newark Liberty Intl. Airport
AVT
Aventura Brightline Train Station
$382 Roundtrip, found 16 hours ago
$382
Roundtrip
found 16 hours ago
Select JetBlue Airways flight, departing Tue, Sep 15 from Newark Liberty Intl. Airport to Aventura Brightline Train Station, returning Tue, Oct 6, priced at $382 found 16 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 October, 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 $118, 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 $118 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$118

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! (987 reviews)
"My wife and I have bed bug bites all over our bodies and we have been unable to get in contact with the hotel"

Reviewed on Jun 6, 2026

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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! (583 reviews)
"Todo"

Reviewed on Jun 2, 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! (453 reviews)
"The property is beautiful and tucked away from the main strip. Quiet resort, clean rooms, beautiful sauna and beach area. The seaweed was bad this year and so it smelled terribly, but that's all on mother nature. Rooms were very clean and comfortable, dog friendly, overall a great experience. Plenty ..."

Reviewed on Jun 2, 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! (1,172 reviews)
"First time staying at a resort in the Florida Keys. The whole experience was excellent giving May end sees less tourists and resort feels “private” to some extent. It’s definitely expensive given the resort fees and parking fees per night you pay for what you get. The restaurants/bars are Miami pricing ..."

Reviewed on Jun 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! (1,301 reviews)
"This was a wonderful place to stay!!"

Reviewed on Jun 4, 2026

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Lime Tree Bay 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 ...
8.2/10 Very Good! (1,010 reviews)
"This is really neat and a unique find. The dinner at salt and ash we had was amazing! We were upgraded to a villa and it was decent but the downstairs bathroom was locked and it needed some better cleaning in the bathrooms upstairs and towel racks!!! It wasn’t horrible, but not the best…. I didn’t ..."

Reviewed on Jun 3, 2026

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Hawks Cay 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 ...
9.2/10 Wonderful! (1,148 reviews)
"Staff is wonderful. Older property, old funriture in the 2 suites we had. They added $20 per day per suite for parking without telling me We had 1 car between us. They did remove it, Restaurant is closed on Monday. Ice Machine is only on the ground level and 1 machine for the entire building. Gym ..."

Reviewed on Jun 5, 2026

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Fairfield Inn & Suites by Marriott Marathon Florida Keys
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! (1,003 reviews)
"Second time we have stayed there. The in room fridge is a little tight, for what we like to use it for. Great location for the first half our trip. Great to have the beach chairs and cooler and umbrella!! Will definitely use that amenity again in the future."

Reviewed on Jun 4, 2026

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Courtyard by Marriott Faro Blanco Resort, Marathon Florida Keys
See all 2,363 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.