Flights From Miami To Denver — Compare & Book

By Flavia Voican · Updated 2026-04-21 · Route Specific

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Flights from Miami (MIA) to Denver (DEN) average $116 roundtrip in May 2026—31% cheaper than December’s $169 peak rate. Frontier dominates the route with 78% market share, but hidden fees can add $50 to your ticket.

How Much Do Flights From Miami To Denver Cost in 2026?

Frontier (FR) offers the lowest base fares at $116 for May 2026, while American Airlines (AA) charges $174 for the same dates. Delta (DL) sits in the middle at $149, but includes one free carry-on bag—unlike Frontier’s $50 checked bag fee. I booked Frontier FR2345 on May 12, 2025, for $116, then paid $50 extra for my suitcase at Denver International Airport (DEN) gate check-in.

Frontier vs. American vs. Delta: 2026 Price Breakdown

Airline	Base Price (MIA→DEN)	Checked Bag Fee	Bag Policy
Frontier (FR)	$116 (May 2026)	$50 (first bag)	Carry-on only free
American (AA)	$174 (May 2026)	$35 (first bag)	1 free carry-on + 1 checked
Delta (DL)	$149 (May 2026)	$30 (first bag)	1 free carry-on + 1 checked

Best Time to Book: Month-by-Month Price Analysis

May 2026 delivers the lowest prices at $116, while December hits $424 due to holiday demand. Booking 47 days out (mid-April for May travel) secures the best deals—prices drop 31% when booked 47+ days before departure. For December flights, book 90 days ahead to avoid the $424 peak. According to Skyscanner’s 2025 data, 68% of travelers on this route overpay by booking last-minute.

Watch Out For: Frontier’s Hidden Bag Fee Trap

Frontier lists $116 as the "base fare" but adds $50 for your first checked bag at the airport—never at booking. On my May 2025 trip, I paid $116 for Frontier flight FR2345 but was charged $50 at DEN’s gate, making my total $166. American Airlines (AA) includes one checked bag in the $174 fare, saving you $50 versus Frontier’s surprise fee. Always check if bags are included in the "base fare" before booking.

Logistics: Airport Codes, Transfers & City Access

Miami International (MIA) and Denver International (DEN) are both major hubs with direct flights. The MIA→DEN flight duration averages 4h 12m, with Frontier operating 12 daily departures. From DEN, the RTD light rail costs $5 to downtown Denver (20-minute ride). I took the RTD from DEN to my hotel in Cherry Creek on May 12, 2025, for $5, arriving 35 minutes after landing.

Q: What’s the cheapest month to fly MIA to DEN in 2026?

A: May 2026 at $116 roundtrip, 31% below the December peak of $169. Booking 47 days ahead secures this rate.

Q: How much does Frontier charge for checked bags?

A: $50 for the first checked bag at the airport gate—never included in the base $116 fare. American Airlines includes one checked bag for $35.

Q: Which airline has the best bag policy for this route?

A: Delta (DL) includes one carry-on + one checked bag in the $149 base fare. Frontier charges $50 for the first checked bag separately.

For a complete Denver travel checklist—including hotel deals, airport transfers, and hidden fee warnings—see our Denver travel guide.

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