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Grassy Key

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Grassy Key Flights as Low as $58

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

Frontier Airlines
Fri, May 15 - Fri, May 22
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 Fri, May 15 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Fri, May 22, priced at $58 found 1 hour ago
Frontier Airlines
Mon, May 4 - Thu, May 14
RDU
Raleigh - Durham Intl.
MIA
Miami Intl.
$68 Roundtrip, found 4 days ago
$68
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Mon, May 4 from Raleigh - Durham Intl. to Miami Intl., returning Thu, May 14, priced at $68 found 4 days ago
Spirit Airlines
Sun, May 10 - Thu, May 14
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$70 Roundtrip, found 1 day ago
$70
Roundtrip
found 1 day ago
Select Spirit Airlines flight, departing Sun, May 10 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Thu, May 14, priced at $70 found 1 day ago
Spirit Airlines
Mon, Aug 31 - Thu, Sep 10
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$100 Roundtrip, found 4 hours ago
$100
Roundtrip
found 4 hours ago
Select Spirit Airlines flight, departing Mon, Aug 31 from Newark Liberty Intl. Airport to Miami Intl., returning Thu, Sep 10, priced at $100 found 4 hours ago
Delta
Wed, May 27 - Wed, Jun 10
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$147 Roundtrip, found 1 day ago
$147
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, May 27 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Jun 10, priced at $147 found 1 day ago
American Airlines
Sat, May 16 - Wed, May 20
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$151 Roundtrip, found 4 hours ago
$151
Roundtrip
found 4 hours ago
Select American Airlines flight, departing Sat, May 16 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, May 20, priced at $151 found 4 hours ago
United
Mon, Aug 31 - Thu, Sep 10
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$197 Roundtrip, found 4 hours ago
$197
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Aug 31 from Newark Liberty Intl. Airport to Miami Intl., returning Thu, Sep 10, priced at $197 found 4 hours ago
United
Wed, Jun 3 - Wed, Jun 10
EWR
Newark Liberty Intl. Airport
EYW
Key West Intl.
$289 Roundtrip, just found
$289
Roundtrip
just found
Select United flight, departing Wed, Jun 3 from Newark Liberty Intl. Airport to Key West Intl., returning Wed, Jun 10, priced at $289 just found
JetBlue Airways
Sun, May 10 - Wed, May 13
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$294 Roundtrip, found 6 days ago
$294
Roundtrip
found 6 days ago
Select JetBlue Airways flight, departing Sun, May 10 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Wed, May 13, priced at $294 found 6 days ago
JetBlue Airways
Sat, May 16 - Wed, May 20
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$309 Roundtrip, found 1 day ago
$309
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Sat, May 16 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Wed, May 20, priced at $309 found 1 day ago
Delta
Sat, Jun 20 - Wed, Jul 1
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$327 Roundtrip, found 2 days ago
$327
Roundtrip
found 2 days ago
Select Delta flight, departing Sat, Jun 20 from Hartsfield-Jackson Atlanta Intl. to Key West Intl., returning Wed, Jul 1, priced at $327 found 2 days ago
JetBlue Airways
Wed, May 27 - Wed, Jun 3
EWR
Newark Liberty Intl. Airport
EKW
Miami Central Brightline Train Station
$345 Roundtrip, found 2 days ago
$345
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Wed, May 27 from Newark Liberty Intl. Airport to Miami Central Brightline Train Station, returning Wed, Jun 3, priced at $345 found 2 days ago
JetBlue Airways
Wed, May 6 - Tue, May 12
RDU
Raleigh - Durham Intl.
EKW
Miami Central Brightline Train Station
$349 Roundtrip, found 3 days ago
$349
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Wed, May 6 from Raleigh - Durham Intl. to Miami Central Brightline Train Station, returning Tue, May 12, priced at $349 found 3 days ago
JetBlue Airways
Sat, Aug 8 - Tue, Aug 25
RDU
Raleigh - Durham Intl.
AVT
Aventura Brightline Train Station
$387 Roundtrip, found 2 days ago
$387
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Sat, Aug 8 from Raleigh - Durham Intl. to Aventura Brightline Train Station, returning Tue, Aug 25, priced at $387 found 2 days ago
JetBlue Airways
Mon, Aug 31 - Thu, Sep 10
EWR
Newark Liberty Intl. Airport
AVT
Aventura Brightline Train Station
$388 Roundtrip, found 6 hours ago
$388
Roundtrip
found 6 hours ago
Select JetBlue Airways flight, departing Mon, Aug 31 from Newark Liberty Intl. Airport to Aventura Brightline Train Station, returning Thu, Sep 10, priced at $388 found 6 hours ago
Alaska Airlines
Thu, Sep 10 - Sun, Sep 13
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$27,726 Roundtrip, found 3 days ago
$27,726
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Sep 10 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sun, Sep 13, priced at $27,726 found 3 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 May, 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 $58, 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 $58 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$57

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! (932 reviews)
Pretty bare minimum. No instruction on operating tv. Air conditioner didn’t work very well. The bottles of shampoo and shower soap were empty.

Reviewed on Apr 25, 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! (435 reviews)
Great property, my only complaint was we had the same room with a couple we were traveling with and asked to be next to each other, they said they couldn't we had one room in between us even though nobody was in the other rooms. So Boo on you!!

Reviewed on Apr 21, 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! (567 reviews)
Room was clean, bed was comfortable. Not a great location for beaches/attractions but we were just passing through so it worked out.

Reviewed on Apr 23, 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, 3 outdoor pools, and a full-service spa. Our guests praise the pool and the helpful staff in our ...
8/10 Very Good! (1,004 reviews)
This was a perfect family-friendly vacation spot! The kids loved the pool and the lagoon! The Family Oasis room was perfect for our family! A king sized bed for Mom and Dad and bunkbeds for the kids to have their own space. The room was clean and stocked with towels, toilet paper, and bathroom essentials. ...

Reviewed on Apr 25, 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! (1,130 reviews)
Staff is great and goes and beyond to ensure your stay is relaxing and comfortable. Beautiful property!

Reviewed on Apr 25, 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! (1,249 reviews)
Our stay at Lime Tree was perfect. The staff was extremely friendly and helpful. The amenities were great whether you are active or just want to chill. Our room was a top floor waterfront with balcony. The sunsets were spectacular, definitely the room to book! The room and resort had everything needed ...

Reviewed on Apr 26, 2026

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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 ...
9.2/10 Wonderful! (1,118 reviews)
Great resort with all amenities. Pool, bar, restaurant all wonderful.

Reviewed on Apr 24, 2026

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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 ...
8.6/10 Excellent! (1,044 reviews)
Small island hotel , very clean, really liked it, will be back again

Reviewed on Apr 25, 2026

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Kingsail Resort
See all 2,330 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.