Carrier route record
F9MIA→BWI
Frontier Airlines · Miami to Baltimore
- Flights
- 269
- Period
- September 2025 to August 2026
- Share of route
- 12%
- Carriers
- 5
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on MIA to BWI sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 269 flights. The strongest carrier on the route with a full sample, Southwest Airlines, flew 1,188 at 73.6% on time.
The national on-time rate over the same period is 77.3%, so Frontier on MIA to BWI runs 5 points behind the country as a whole. Across a thousand flights that is about 51 extra late arrivals.
Key figures
On time
72.2%
Arrivals under 15 minutes late, of 259 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
3.35%
National rate is 1.89%
Whole route
73.5%
Every carrier on MIA to BWI, 2,291 flights
These figures cover 269 flights between September 2025 and August 2026. Beyond the headline rate, 9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Frontier against every carrier on MIA to BWI
Frontier flew 269 of the 2,291 flights on MIA to BWI, about 12% of it. Its 72.2% on time is about level with the route as a whole at 73.5%. Ranked by on-time rate it is number three of five carriers on the route, where the range runs from Envoy at 90.9% to American at 70.8%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: 3 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Airthin sample | 121 | 90.9% | 49 min | 0.00% | A+ |
| Southwest Airlines | 1,188 | 73.6% | 54 min | 2.10% | C |
| Frontier Airlines (this page)thin sample | 269 | 72.2% | 84 min | 3.35% | C− |
| Spirit Airlinesthin sample | 15 | 71.4% | 149 min | 6.67% | C− |
| American Airlines | 698 | 70.8% | 66 min | 2.01% | C |
No carrier stands out. Southwest tops the table at 73.6%, 3 points clear of the bottom, which is inside the range this kind of sample moves year to year.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 22 points, against 3 points between the best and worst carrier.
- 5am–8am46 flights86.4%
- 8am–11am39 flights86.8%
- 11am–2pm15 flights—
- 2pm–5pm140 flights64.9%
- 5pm–8pm20 flights—
- 8pm–5am9 flights—
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 86.8% of the time, against 64.9% for the afternoon window. That is 22 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 140 flights scheduled in it.
Across the year
Frontier on MIA to BWI through the year
- Jul–Sep 202521 flights—
- Oct–Dec 202556 flights78.6%
- Jan–Mar 202660 flights80.7%
- Apr–Jun 202670 flights71.0%
- Jul–Sep 202662 flights57.1%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 72.2% on time across 269 flights.
Frontier on MIA to BWI did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.7% on time and its weakest Jul–Sep 2026 at 57.1%, a swing of 24 points on roughly 67 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
Across the week, Thursday is the strongest day at 82.5% on time and Monday the weakest at 64.4%, a spread of 18 points.
Arrival by arrival
How late Frontier on MIA to BWI runs when it is late
Frontier on MIA to BWI often beats the schedule: 101 of 259 completed flights, 39%, arrived 15 minutes or more early. The 72 late arrivals split 25 under half an hour, 22 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early101 flights39.0%
- Within 15 min86 flights33.2%
- 15–29 min late25 flights9.7%
- 30–59 min late22 flights8.5%
- 1–2 hours late14 flights5.4%
- 2+ hours late11 flights4.2%
Scale runs 0% to 100%.
Share of 259 completed flights by arrival against schedule.
13 of 66 late departures made up the time and arrived on time, 20% of them. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BWI.
The worst days
Worst days for Frontier on MIA to BWI
The latest arrival of the period was on 31 December 2025, 13 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 December 2025 | 13 hours 46 minutes | Carrier |
| 28 December 2025 | 8 hours 44 minutes | Carrier |
| 19 June 2026 | 6 hours 37 minutes | Late-arriving aircraft |
| 27 July 2026 | 5 hours 11 minutes | Carrier |
| 28 July 2026 | 3 hours 57 minutes | National Airspace System |
Delay causes
Why Frontier runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,023 reported delay minutes.
- 41%Carrier
- 36%Late-arriving aircraft
- 20%National Airspace System
- 3%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,023 reported delay minutes here, that single category outweighs weather by 13 to one. The split is drawn from 6,023 reported delay minutes.
The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,473 of the 6,023 delay minutes reported here.
Cancellations run at 3.35%, against 1.89% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
9.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 946 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 71.1% on time across 269 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 269 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Frontier on MIA to BWI
Put together: the delay figures matter less here than the 3.35% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 259 completed flights over 12 months sit behind that.
Related
Where to go next
- MIA to BWI, every carrier
- Frontier on BWI to MIA, the return leg
- Envoy Air on MIA to BWI90.9%
- Southwest Airlines on MIA to BWI73.6%
- American Airlines on MIA to BWI70.8%
- Frontier Airlines network-wide record
- Miami International (MIA) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.