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Grassy Key

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Grassy Key Flights as Low as $80

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

Frontier Airlines
Sat, Aug 22 - Tue, Aug 25
IAH
George Bush Intercontinental
MIA
Miami Intl.
$80 Roundtrip, found 3 hours ago
$80
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Sat, Aug 22 from George Bush Intercontinental to Miami Intl., returning Tue, Aug 25, priced at $80 found 3 hours ago
Frontier Airlines
Tue, Oct 13 - Sat, Oct 24
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$90 Roundtrip, found 1 hour ago
$90
Roundtrip
found 1 hour ago
Select Frontier Airlines flight, departing Tue, Oct 13 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Oct 24, priced at $90 found 1 hour ago
Frontier Airlines
Fri, Aug 28 - Tue, Sep 1
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$93 Roundtrip, found 3 hours ago
$93
Roundtrip
found 3 hours ago
Select Frontier Airlines flight, departing Fri, Aug 28 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Tue, Sep 1, priced at $93 found 3 hours ago
Delta
Tue, Oct 13 - Sat, Oct 24
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$159 Roundtrip, found 1 hour ago
$159
Roundtrip
found 1 hour ago
Select Delta flight, departing Tue, Oct 13 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Oct 24, priced at $159 found 1 hour ago
United
Sat, Aug 22 - Tue, Aug 25
IAH
George Bush Intercontinental
MIA
Miami Intl.
$169 Roundtrip, found 3 hours ago
$169
Roundtrip
found 3 hours ago
Select United flight, departing Sat, Aug 22 from George Bush Intercontinental to Miami Intl., returning Tue, Aug 25, priced at $169 found 3 hours ago
American Airlines
Tue, Oct 13 - Sat, Oct 24
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$177 Roundtrip, found 1 hour ago
$177
Roundtrip
found 1 hour ago
Select American Airlines flight, departing Tue, Oct 13 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Sat, Oct 24, priced at $177 found 1 hour ago
Frontier Airlines
Tue, Sep 8 - Tue, Sep 22
CMH
John Glenn Columbus Intl.
MIA
Miami Intl.
$246 Roundtrip, found 4 hours ago
$246
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Tue, Sep 8 from John Glenn Columbus Intl. to Miami Intl., returning Tue, Sep 22, priced at $246 found 4 hours ago
JetBlue Airways
Sun, Oct 11 - Sun, Oct 25
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$272 Roundtrip, found 1 day ago
$272
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Sun, Oct 11 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Sun, Oct 25, priced at $272 found 1 day ago
Delta
Sat, Sep 19 - Tue, Sep 29
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$279 Roundtrip, found 2 hours ago
$279
Roundtrip
found 2 hours ago
Select Delta flight, departing Sat, Sep 19 from Hartsfield-Jackson Atlanta Intl. to Key West Intl., returning Tue, Sep 29, priced at $279 found 2 hours ago
American Airlines
Sat, Aug 22 - Sat, Aug 29
CMH
John Glenn Columbus Intl.
EYW
Key West Intl.
$287 Roundtrip, found 1 day ago
$287
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Aug 22 from John Glenn Columbus Intl. to Key West Intl., returning Sat, Aug 29, priced at $287 found 1 day ago
JetBlue Airways
Tue, Oct 13 - Sat, Oct 24
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$303 Roundtrip, found 4 hours ago
$303
Roundtrip
found 4 hours ago
Select JetBlue Airways flight, departing Tue, Oct 13 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Sat, Oct 24, priced at $303 found 4 hours ago
JetBlue Airways
Tue, Aug 4 - Tue, Aug 4
IAH
George Bush Intercontinental
EKW
Miami Central Brightline Train Station
$320 Roundtrip, found 3 days ago
$320
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Tue, Aug 4 from George Bush Intercontinental to Miami Central Brightline Train Station, returning Tue, Aug 4, priced at $320 found 3 days ago
JetBlue Airways
Sat, Aug 22 - Tue, Aug 25
IAH
George Bush Intercontinental
AVT
Aventura Brightline Train Station
$342 Roundtrip, found 2 days ago
$342
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Sat, Aug 22 from George Bush Intercontinental to Aventura Brightline Train Station, returning Tue, Aug 25, priced at $342 found 2 days ago
Delta
Wed, Jul 29 - Tue, Aug 4
IAH
George Bush Intercontinental
EYW
Key West Intl.
$344 Roundtrip, found 3 days ago
$344
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Jul 29 from George Bush Intercontinental to Key West Intl., returning Tue, Aug 4, priced at $344 found 3 days ago
JetBlue Airways
Fri, Dec 25 - Mon, Jan 4
CMH
John Glenn Columbus Intl.
AVT
Aventura Brightline Train Station
$783 Roundtrip, found 3 days ago
$783
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Fri, Dec 25 from John Glenn Columbus Intl. to Aventura Brightline Train Station, returning Mon, Jan 4, priced at $783 found 3 days ago
JetBlue Airways
Fri, Dec 25 - Mon, Jan 4
CMH
John Glenn Columbus Intl.
EKW
Miami Central Brightline Train Station
$783 Roundtrip, found 3 days ago
$783
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Fri, Dec 25 from John Glenn Columbus Intl. to Miami Central Brightline Train Station, returning Mon, Jan 4, priced at $783 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 August, 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 $80, 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 $80 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$66

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 ...
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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! (471 reviews)
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Reviewed on Jul 12, 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! (594 reviews)
"We love that the rooms are set up for coffee and light meal prep. Plenty of tables outside to eat at as well and lots of green space for kids and dogs! Rooms are always clean and with late check in codes are shared for easy access to your room."

Reviewed on Jul 10, 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 ...
8.2/10 Very Good! (1,001 reviews)
"Everything was great as expected after staying here the last 20 plus years it keeps getting better."

Reviewed on Jul 16, 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! (1,197 reviews)
"Tfe"

Reviewed on Jul 16, 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! (1,393 reviews)
"This was our second time visiting, we had a great time and the room was beautiful with an ocean view, we spend a good time at the pool, went out dining and enjoyed a beautiful morning at the beach, the Staff was great at checking and we like the restaurant at the resort. We will be back"

Reviewed on Jul 16, 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. ...
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Tranquility Bay Beachfront Hotel and Resort
Faro Blanco Resort Marathon Florida Keys, Curio by Hilton

Faro Blanco Resort Marathon Florida Keys, Curio by Hilton

4 out of 5
1996 Overseas Highway Marathon FL
Book a stay at this spa resort in Marathon. Enjoy free WiFi, 4 outdoor pools, and a full-service spa. Our guests praise the pool and the restaurant in our reviews. ...
8.6/10 Excellent! (1,168 reviews)
"Great place and we will continue to stay there at Kesey 3 times a yearly"

Reviewed on Jul 16, 2026

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Faro Blanco Resort Marathon Florida Keys, Curio by Hilton
See all 2,359 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.