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Grassy Key

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Grassy Key Flights as Low as $74

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

Spirit Airlines
Wed, Oct 8 - Thu, Oct 9
IAH
George Bush Intercontinental
MIA
Miami Intl.
$74 Roundtrip, found 7 hours ago
$74
Roundtrip
found 7 hours ago
Select Spirit Airlines flight, departing Wed, Oct 8 from George Bush Intercontinental to Miami Intl., returning Thu, Oct 9, priced at $74 found 7 hours ago
Spirit Airlines
Sat, Sep 20 - Mon, Sep 29
IAH
George Bush Intercontinental
MIA
Miami Intl.
$84 Roundtrip, found 10 hours ago
$84
Roundtrip
found 10 hours ago
Select Spirit Airlines flight, departing Sat, Sep 20 from George Bush Intercontinental to Miami Intl., returning Mon, Sep 29, priced at $84 found 10 hours ago
Spirit Airlines
Sun, Aug 31 - Wed, Sep 3
IAH
George Bush Intercontinental
MIA
Miami Intl.
$85 Roundtrip, found 5 days ago
$85
Roundtrip
found 5 days ago
Select Spirit Airlines flight, departing Sun, Aug 31 from George Bush Intercontinental to Miami Intl., returning Wed, Sep 3, priced at $85 found 5 days ago
Spirit Airlines
Sun, Oct 12 - Mon, Oct 20
IAH
George Bush Intercontinental
MIA
Miami Intl.
$86 Roundtrip, found 8 hours ago
$86
Roundtrip
found 8 hours ago
Select Spirit Airlines flight, departing Sun, Oct 12 from George Bush Intercontinental to Miami Intl., returning Mon, Oct 20, priced at $86 found 8 hours ago
United
Wed, Oct 8 - Thu, Oct 9
IAH
George Bush Intercontinental
MIA
Miami Intl.
$107 Roundtrip, found 7 hours ago
$107
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Oct 8 from George Bush Intercontinental to Miami Intl., returning Thu, Oct 9, priced at $107 found 7 hours ago
American Airlines
Wed, Oct 8 - Thu, Oct 9
IAH
George Bush Intercontinental
MIA
Miami Intl.
$107 Roundtrip, found 7 hours ago
$107
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Wed, Oct 8 from George Bush Intercontinental to Miami Intl., returning Thu, Oct 9, priced at $107 found 7 hours ago
Spirit Airlines
Sat, Aug 9 - Thu, Aug 14
LAS
Harry Reid Intl.
MIA
Miami Intl.
$146 Roundtrip, found 6 hours ago
$146
Roundtrip
found 6 hours ago
Select Spirit Airlines flight, departing Sat, Aug 9 from Harry Reid Intl. to Miami Intl., returning Thu, Aug 14, priced at $146 found 6 hours ago
Frontier Airlines
Mon, Oct 6 - Sat, Oct 11
IAH
George Bush Intercontinental
MIA
Miami Intl.
$147 Roundtrip, found 23 hours ago
$147
Roundtrip
found 23 hours ago
Select Frontier Airlines flight, departing Mon, Oct 6 from George Bush Intercontinental to Miami Intl., returning Sat, Oct 11, priced at $147 found 23 hours ago
Delta
Wed, Oct 8 - Thu, Oct 9
IAH
George Bush Intercontinental
MIA
Miami Intl.
$197 Roundtrip, found 7 hours ago
$197
Roundtrip
found 7 hours ago
Select Delta flight, departing Wed, Oct 8 from George Bush Intercontinental to Miami Intl., returning Thu, Oct 9, priced at $197 found 7 hours ago
JetBlue Airways
Wed, Dec 3 - Sun, Dec 14
LAS
Harry Reid Intl.
EKW
Miami Central Brightline Train Station
$281 Roundtrip, found 3 days ago
$281
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Wed, Dec 3 from Harry Reid Intl. to Miami Central Brightline Train Station, returning Sun, Dec 14, priced at $281 found 3 days ago
JetBlue Airways
Fri, Aug 15 - Mon, Aug 18
LAS
Harry Reid Intl.
AVT
Aventura Brightline Train Station
$308 Roundtrip, found 2 days ago
$308
Roundtrip
found 2 days ago
Select JetBlue Airways flight, departing Fri, Aug 15 from Harry Reid Intl. to Aventura Brightline Train Station, returning Mon, Aug 18, priced at $308 found 2 days ago
JetBlue Airways
Tue, Aug 26 - Thu, Aug 28
LAS
Harry Reid Intl.
MIA
Miami Intl.
$321 Roundtrip, found 3 hours ago
$321
Roundtrip
found 3 hours ago
Select JetBlue Airways flight, departing Tue, Aug 26 from Harry Reid Intl. to Miami Intl., returning Thu, Aug 28, priced at $321 found 3 hours ago
American Airlines
Tue, Jul 22 - Wed, Aug 13
IAH
George Bush Intercontinental
EYW
Key West Intl.
$321 Roundtrip, found 2 days ago
$321
Roundtrip
found 2 days ago
Select American Airlines flight, departing Tue, Jul 22 from George Bush Intercontinental to Key West Intl., returning Wed, Aug 13, priced at $321 found 2 days ago
Alaska Airlines
Mon, Dec 8 - Wed, Dec 10
LAS
Harry Reid Intl.
MIA
Miami Intl.
$345 Roundtrip, found 3 days ago
$345
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Mon, Dec 8 from Harry Reid Intl. to Miami Intl., returning Wed, Dec 10, priced at $345 found 3 days ago
United
Wed, Oct 8 - Thu, Oct 9
IAH
George Bush Intercontinental
AVT
Aventura Brightline Train Station
$823 Roundtrip, found 7 hours ago
$823
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Oct 8 from George Bush Intercontinental to Aventura Brightline Train Station, returning Thu, Oct 9, priced at $823 found 7 hours ago
United
Wed, Oct 8 - Thu, Oct 9
IAH
George Bush Intercontinental
EKW
Miami Central Brightline Train Station
$823 Roundtrip, found 7 hours ago
$823
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Oct 8 from George Bush Intercontinental to Miami Central Brightline Train Station, returning Thu, Oct 9, priced at $823 found 7 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 $74, 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 $74 right now, why wait?

Grassy Key Flight Information
Destination airport
Miami Intl.
Destination airport IATA code
MIA
Roundtrip price
$74

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! (689 reviews)
"Love the vibe. The property is gorgeous, with fishing, kayaking, and the pool. We loved sitting outside under the palm trees at night. The breakfast was delicious and the staff were great. 100% will come again."

Reviewed on Jul 12, 2025

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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
Book a stay at this beach hotel in Marathon. Enjoy free WiFi, free parking, and 2 outdoor pools. Our guests praise the helpful staff and the property condition ...
9.4/10 Exceptional! (292 reviews)
"Expedia messed up our rental and the resort was very accommodating. Would recommend booking through the resort directly and not through Expedia"

Reviewed on Jul 13, 2025

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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! (479 reviews)
"The property was Ok just needs a little upgrades our bath tub looked like it was old but, overall the stay was good. The area for the dogs was great and, the views of the dock outstanding. Manuel in front desk very nice and courteous. The only thing missing was a beach area with a bar."

Reviewed on Jun 20, 2025

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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 beach 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! (1,015 reviews)
"Great"

Reviewed on Jul 14, 2025

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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, MM 47, Marathon, FL
Stay at this 5-star 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! (1,003 reviews)
Nice hotel
"Great rooms. Not good value for money food. Drinks very expensive. Staff were nice. Staff at food market were amazing and friendly . Too many bugs at the beach and outdoor areas."

Reviewed on Jul 15, 2025

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Isla Bella Beach Resort & Spa
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! (1,001 reviews)
"The property and the employees ( Jahneil ) were excellent. My problem is I booked through Expedia. And it took such a long time for my information to be sent to the hotel front desk. The young lady that took care of us is an exception and a service to the facility. The parking was very tight and ..."

Reviewed on Jul 15, 2025

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Fairfield Inn & Suites by Marriott Marathon Florida Keys
Lime Tree Bay Resort

Lime Tree Bay Resort

3.5 out of 5
68500 Overseas Hwy, Long Key, FL
Stay at this 3.5-star 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! (1,094 reviews)
"Very friendly and relaxed Room very nice. Lovely views"

Reviewed on Jul 7, 2025

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Lime Tree Bay Resort
Courtyard by Marriott Faro Blanco Resort

Courtyard by Marriott Faro Blanco Resort

3 out of 5
2146 Overseas Hwy, Marathon, FL
Stay at this 3-star beach hotel in Marathon. Enjoy free WiFi, 2 outdoor pools, and 2 bars/lounges. Our guests praise the pool and the helpful staff in our reviews. ...
9/10 Wonderful! (1,000 reviews)
Wonderful getaway half way down the Keys
"The hotel was lovely and the staff was attentive. Lots of nice amenities like hammock swings, outdoor chess board, cornhole, 2 nice pools. Would stay there again!"

Reviewed on Jul 14, 2025

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Courtyard by Marriott Faro Blanco Resort
See all 2,272 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.