MIA to BOS flight delays & on-time performance
Nonstop flights from Miami International Airport to Boston Logan International Airport · 1,258 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MIA or BOS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Miami (MIA) to Boston (BOS) arrived on time 70% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.2% were cancelled, and 12% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (71% on time); Spirit Airlines was the least (55%).
- Departures scheduled around 8am did best (92% on time); around 7pm did worst (59%).
- Wednesday was the most reliable day to fly (75% on time) and Monday the least (65%).
- The largest source of delay minutes was late-arriving aircraft (40%).
Which airline is most on time from MIA to BOS?
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 |
|---|---|---|---|---|---|
| Envoy AirRegional airline operating American Eagle flights. | 100% | 0.0% | 7 min | 0.0% | 1 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 81% | 0.0% | 20 min | 9.5% | 21 |
| JetBlue | 74% | 0.0% | 12 min | 5.7% | 35 |
| Delta Air Lines | 71% | 2.8% | 24 min | 11.4% | 889 |
| American Airlines | 71% | 1.7% | 22 min | 11.1% | 2,251 |
| Spirit Airlines | 55% | 6.5% | 32 min | 26.3% | 184 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am92%265 flights
- 7am80%108 flights
- 8am92%306 flights
- 9am81%64 flights
- 10am77%210 flights
- 11am72%457 flights
- 12pm63%255 flights
- 2pm73%190 flights
- 5pm60%294 flights
- 6pm61%84 flights
- 7pm59%471 flights
- 8pm63%257 flights
- 9pm59%362 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday65%5.9% cancelled
- Tuesday72%2.5% cancelled
- Wednesday75%0.2% cancelled
- Thursday70%0.0% cancelled
- Friday67%1.0% cancelled
- Saturday74%1.7% cancelled
- Sunday66%4.1% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft40%
- Airline (crew, maintenance, cleaning, fueling)33%
- Air traffic control & airport congestion24%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather73%
- Airline (crew, maintenance, cleaning, fueling)20%
- Air traffic control & airport congestion7%
- Security0%
MIA to BOS: common questions
- How often are MIA to BOS flights on time?
- 70% 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 Miami to Boston cancelled?
- 2.2% of scheduled flights were cancelled (75 of 3,381).
- How long are typical delays?
- Across all flights the average arrival delay was 23 min (early arrivals count as zero). Flights that were late arrived 73 min behind schedule on average, and 11.9% of flights were an hour or more late.
- How long is taxi time at MIA?
- Flights on this route spent 23 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BOS to MIA — 78% on time
More flights from Miami
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: MIA → BOS, nonstop flights by US airlines that report to the DOT. How we calculate this.