Search Cheap Flights to
Grassy Key

Search 400 airlines and 321,000 hotels worldwide.

Stop Planning & Start Exploring

FREE 24 hour cancellation on most flights

Grassy Key Flights as Low as $68

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

Frontier Airlines
Tue, Aug 18 - Wed, Aug 19
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$68 Roundtrip, found 10 hours ago
$68
Roundtrip
found 10 hours ago
Select Frontier Airlines flight, departing Tue, Aug 18 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Aug 19, priced at $68 found 10 hours ago
Delta
Thu, Nov 26 - Thu, Nov 26
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$154 Roundtrip, found 1 day ago
$154
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Nov 26 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Thu, Nov 26, priced at $154 found 1 day ago
American Airlines
Thu, Nov 26 - Thu, Nov 26
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$154 Roundtrip, found 1 day ago
$154
Roundtrip
found 1 day ago
Select American Airlines flight, departing Thu, Nov 26 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Thu, Nov 26, priced at $154 found 1 day ago
Southwest Airlines
Sat, Nov 14 - Wed, Nov 18
ATL
Hartsfield-Jackson Atlanta Intl.
MIA
Miami Intl.
$179 Roundtrip, found 12 hours ago
$179
Roundtrip
found 12 hours ago
Select Southwest Airlines flight, departing Sat, Nov 14 from Hartsfield-Jackson Atlanta Intl. to Miami Intl., returning Wed, Nov 18, priced at $179 found 12 hours ago
American Airlines
Wed, Sep 23 - Tue, Oct 6
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$179 Roundtrip, found 17 hours ago
$179
Roundtrip
found 17 hours ago
Select American Airlines flight, departing Wed, Sep 23 from Newark Liberty Intl. Airport to Miami Intl., returning Tue, Oct 6, priced at $179 found 17 hours ago
United
Wed, Sep 23 - Tue, Oct 6
EWR
Newark Liberty Intl. Airport
MIA
Miami Intl.
$179 Roundtrip, found 17 hours ago
$179
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Sep 23 from Newark Liberty Intl. Airport to Miami Intl., returning Tue, Oct 6, priced at $179 found 17 hours ago
Frontier Airlines
Sat, Oct 17 - Wed, Oct 21
LAX
Los Angeles Intl.
MIA
Miami Intl.
$228 Roundtrip, found 5 hours ago
$228
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Sat, Oct 17 from Los Angeles Intl. to Miami Intl., returning Wed, Oct 21, priced at $228 found 5 hours ago
Delta
Sun, Sep 20 - Thu, Oct 1
ATL
Hartsfield-Jackson Atlanta Intl.
EYW
Key West Intl.
$263 Roundtrip, just found
$263
Roundtrip
just found
Select Delta flight, departing Sun, Sep 20 from Hartsfield-Jackson Atlanta Intl. to Key West Intl., returning Thu, Oct 1, priced at $263 just found
JetBlue Airways
Tue, Sep 8 - Wed, Sep 16
ATL
Hartsfield-Jackson Atlanta Intl.
EKW
Miami Central Brightline Train Station
$272 Roundtrip, found 2 days ago
$272
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Tue, Sep 8 from Hartsfield-Jackson Atlanta Intl. to Miami Central Brightline Train Station, returning Wed, Sep 16, priced at $272 found 2 days ago
JetBlue Airways
Sat, Nov 14 - Wed, Nov 18
ATL
Hartsfield-Jackson Atlanta Intl.
AVT
Aventura Brightline Train Station
$303 Roundtrip, found 11 hours ago
$303
Roundtrip
found 11 hours ago
Select JetBlue Airways flight, departing Sat, Nov 14 from Hartsfield-Jackson Atlanta Intl. to Aventura Brightline Train Station, returning Wed, Nov 18, priced at $303 found 11 hours ago
Delta
Tue, Aug 25 - Tue, Sep 1
EWR
Newark Liberty Intl. Airport
EYW
Key West Intl.
$319 Roundtrip, found 3 days ago
$319
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Aug 25 from Newark Liberty Intl. Airport to Key West Intl., returning Tue, Sep 1, priced at $319 found 3 days ago
Delta
Tue, Oct 27 - Wed, Nov 18
LAX
Los Angeles Intl.
EYW
Key West Intl.
$341 Roundtrip, found 2 days ago
$341
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Oct 27 from Los Angeles Intl. to Key West Intl., returning Wed, Nov 18, priced at $341 found 2 days ago
JetBlue Airways
Tue, Sep 22 - Tue, Oct 6
EWR
Newark Liberty Intl. Airport
AVT
Aventura Brightline Train Station
$364 Roundtrip, found 1 day ago
$364
Roundtrip
found 1 day ago
Select JetBlue Airways flight, departing Tue, Sep 22 from Newark Liberty Intl. Airport to Aventura Brightline Train Station, returning Tue, Oct 6, priced at $364 found 1 day ago
JetBlue Airways
Sat, Sep 12 - Tue, Sep 15
EWR
Newark Liberty Intl. Airport
EKW
Miami Central Brightline Train Station
$380 Roundtrip, found 11 hours ago
$380
Roundtrip
found 11 hours ago
Select JetBlue Airways flight, departing Sat, Sep 12 from Newark Liberty Intl. Airport to Miami Central Brightline Train Station, returning Tue, Sep 15, priced at $380 found 11 hours ago
JetBlue Airways
Tue, Aug 25 - Wed, Aug 26
LAX
Los Angeles Intl.
EKW
Miami Central Brightline Train Station
$479 Roundtrip, just found
$479
Roundtrip
just found
Select JetBlue Airways flight, departing Tue, Aug 25 from Los Angeles Intl. to Miami Central Brightline Train Station, returning Wed, Aug 26, priced at $479 just found
JetBlue Airways
Sun, Aug 23 - Fri, Aug 28
LAX
Los Angeles Intl.
AVT
Aventura Brightline Train Station
$490 Roundtrip, found 6 days ago
$490
Roundtrip
found 6 days ago
Select JetBlue Airways flight, departing Sun, Aug 23 from Los Angeles Intl. to Aventura Brightline Train Station, returning Fri, Aug 28, priced at $490 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 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 $68, 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 $68 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 ...
8.2/10 Very Good! (1,008 reviews)
"I'm really upset and disappointed because the pictures shown in this app from this Hotel are NOT what my family and I found when we got there. I got 2 rooms (number 3 and 4) right next to the oficice . Both rooms were dirty and the whole property is DETERIORATED and not well maintained, The rooms ..."

Reviewed on Aug 4, 2026

Get rates
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! (481 reviews)
"Wish the AC was better. Amazing staff all around. Comfortable. A true beauty"

Reviewed on Aug 3, 2026

Get rates
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! (598 reviews)
"Many of the guests that were staying considered the resort to belong to themselves only,leaving trash their kids stuff toys etc.all over common areas as well as occupying the community spaces as if no one else existed"

Reviewed on Aug 3, 2026

Get rates
Gulf View Waterfront 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! (1,217 reviews)
"The resort was nice, but it seems that it is understaffed and the staff that is there does not really know what they are doing. Depending who you speak to you get a different answer. Was told that kayaking was available and asked if I can bring my kayaks, they said yes. And when I got there they ..."

Reviewed on Aug 3, 2026

Get rates
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! (1,434 reviews)
"This was my first time staying so far away off campus. Definitely makes enjoying the amenities harder"

Reviewed on Aug 3, 2026

Get rates
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)
"Todo súper bonito volveré me encantó"

Reviewed on Aug 3, 2026

Get rates
Hawks Cay 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! (1,008 reviews)
"excellent"

Reviewed on Aug 4, 2026

Get rates
Tranquility Bay Beachfront Hotel and 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! (1,202 reviews)
"Las habitaciones estaban limpias, al igual que el hotel. El personal atento en general bueno"

Reviewed on Aug 3, 2026

Get rates
Fairfield Inn & Suites by Marriott Marathon Florida Keys
See all 2,367 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.