BOS to MIA flight delays & on-time performance
Nonstop flights from Boston Logan International Airport to Miami International Airport · 1,258 miles · Aug 2025 – Jul 2026
- BOS: Ground delay program, avg 1 hour and 10 minutes. Flights to BOS are delayed at their origin airports due to runway construction: average 1 hour and 10 minutes, up to 3 hours.
On-time arrivals
78%
arrived < 15 min late
Cancelled
2.1%
72 flights
Avg arrival delay
17 min
75 min when late
Airlines
5
3,384 flights tracked
Key facts
- Flights from Boston (BOS) to Miami (MIA) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 2.1% were cancelled, and 8% arrived an hour or more late.
- American Airlines was the most punctual airline here (83% on time); Spirit Airlines was the least (55%).
- Departures scheduled around 5am did best (96% on time); around 4pm did worst (60%).
- Wednesday was the most reliable day to fly (84% on time) and Sunday the least (71%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (38%).
Which airline is most on time from BOS to MIA?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| American Airlines | 83% | 1.7% | 13 min | 6.1% | 2,252 |
| JetBlue | 80% | 0.0% | 7 min | 0.0% | 35 |
| Delta Air Lines | 73% | 2.6% | 22 min | 10.4% | 891 |
| Spirit Airlines | 55% | 5.9% | 38 min | 27.0% | 185 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 48% | 0.0% | 26 min | 9.5% | 21 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am96%365 flights
- 6am93%301 flights
- 7am88%558 flights
- 8am87%245 flights
- 10am81%237 flights
- 12pm78%278 flights
- 1pm71%75 flights
- 2pm63%91 flights
- 3pm64%475 flights
- 4pm60%125 flights
- 5pm62%100 flights
- 6pm70%345 flights
- 7pm63%123 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday78%5.5% cancelled
- Tuesday81%3.2% cancelled
- Wednesday84%0.9% cancelled
- Thursday80%0.0% cancelled
- Friday80%1.0% cancelled
- Saturday76%1.2% cancelled
- Sunday71%3.1% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)38%
- Late-arriving aircraft32%
- Air traffic control & airport congestion27%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather72%
- Airline (crew, maintenance, cleaning, fueling)21%
- Air traffic control & airport congestion7%
- Security0%
BOS to MIA: common questions
- How often are BOS to MIA flights on time?
- 78% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Boston to Miami cancelled?
- 2.1% of scheduled flights were cancelled (72 of 3,384).
- How long are typical delays?
- Across all flights the average arrival delay was 17 min (early arrivals count as zero). Flights that were late arrived 75 min behind schedule on average, and 8.3% of flights were an hour or more late.
- How long is taxi time at BOS?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MIA to BOS — 70% on time
More flights from Boston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BOS → MIA, nonstop flights by US airlines that report to the DOT. How we calculate this.