Cheap flights from Detroit to Grassy Key

View AU$137 flight on Mon, 25 Aug. 2025Opens in a new window

Popular airlines from Detroit to Grassy Key

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 35% on select hotels after you book a flight*
  • payments icon

    Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap Flights from Detroit (DTT) to Grassy Key (MIA)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, 9 Sep. - Tue, 23 Sep.
DTW
Detroit
MIA
Miami
AU$247 Return, found 2 days ago
AU$247
Return
found 2 days ago
Select American Airlines flight, departing Tue, 9 Sep. from Detroit to Miami, returning Tue, 23 Sep., priced at AU$247 found 2 days ago
American Airlines
Wed, 13 Aug. - Wed, 20 Aug.
DTW
Detroit
MIA
Miami
AU$275 Return, found 4 hours ago
AU$275
Return
found 4 hours ago
Select American Airlines flight, departing Wed, 13 Aug. from Detroit to Miami, returning Wed, 20 Aug., priced at AU$275 found 4 hours ago
American Airlines
Thu, 4 Sep. - Thu, 11 Sep.
DTW
Detroit
MIA
Miami
AU$277 Return, found 2 days ago
AU$277
Return
found 2 days ago
Select American Airlines flight, departing Thu, 4 Sep. from Detroit to Miami, returning Thu, 11 Sep., priced at AU$277 found 2 days ago
Delta
Wed, 13 Aug. - Wed, 20 Aug.
DTW
Detroit
MIA
Miami
AU$290 Return, found 4 hours ago
AU$290
Return
found 4 hours ago
Select Delta flight, departing Wed, 13 Aug. from Detroit to Miami, returning Wed, 20 Aug., priced at AU$290 found 4 hours ago
American Airlines
Thu, 21 Aug. - Sun, 24 Aug.
DTW
Detroit
MIA
Miami
AU$292 Return, found 1 day ago
AU$292
Return
found 1 day ago
Select American Airlines flight, departing Thu, 21 Aug. from Detroit to Miami, returning Sun, 24 Aug., priced at AU$292 found 1 day ago
United
Tue, 9 Sep. - Tue, 23 Sep.
DTW
Detroit
MIA
Miami
AU$480 Return, found 2 days ago
AU$480
Return
found 2 days ago
Select United flight, departing Tue, 9 Sep. from Detroit to Miami, returning Tue, 23 Sep., priced at AU$480 found 2 days ago

Find the cheapest month to fly from Detroit (DTT) to Miami (MIA)

September is typically the cheapest month to fly

From AU$110 - AU$305 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.