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Route on-time record

MIA to BOS: most on-time flights and the best time to fly

Miami (Miami International Airport) to Boston (Boston Logan International Airport). 3,451 nonstop flights in Jun 2025 to May 2026, 69% arrived within 15 minutes and 2.5% were cancelled. The most reliable flight number was American 2764 at 8:22 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

MIA → BOS

Miami to Boston: 3,451 nonstop flights a year

On time (12 months)

69%

Cancelled

2.5%

avg delay 24 min

Best time to leave

Before 9 AM

89% on time vs 55% 3 to 6 PM

Most reliable airline

American

69% chance on time

Check MIA to BOS fares

Lowest nonstop fare seen in the next two months: $170 (American 2064 on 2026-10-21). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · American 2764

    8:22 AM → 11:44 AM3h 22m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    90%

    chance on time

    On time (history)
    94%
    Cancelled
    1.3%
    Avg arrival delay
    6 min
    • Arrived on time 94% of the time (154 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 55%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).

    Moderate track record · 154 flights

    Find American 2764 fares Opens this date on Aviasales

  2. #2 · American 815

    6:43 AM → 10:06 AM3h 23m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1894, 891; its record covers all of them.

    88%

    chance on time

    On time (history)
    92%
    Cancelled
    2.5%
    Avg arrival delay
    8 min
    • Arrived on time 92% of the time (157 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 55%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).

    Moderate track record · 157 flights

    Find American 815 fares Opens this date on Aviasales

  3. #3 · American 1571

    8:30 AM → 11:51 AM3h 21m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    87%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 91% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 55%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).

    Limited track record · 44 flights

    Find American 1571 fares Opens this date on Aviasales

  4. #4 · American 896

    11:11 AM → 2:33 PM3h 22m nonstop

    Local times, typical schedule. Last flown 2026-05-18.

    78%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 81% of the time (74 flights, Jun 2025 to May 2026).
    • Never cancelled in 74 scheduled flights.
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 74 flights

    Find American 896 fares Opens this date on Aviasales

  5. #5 · American 1909

    10:25 AM → 1:47 PM3h 26m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    78%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 84% of the time (32 flights, Jun 2025 to May 2026).
    • Never cancelled in 32 scheduled flights.
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Limited track record · 32 flights

    Find American 1909 fares Opens this date on Aviasales

  6. #6 · American 1589

    9:23 AM → 12:46 PM3h 23m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    78%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find American 1589 fares Opens this date on Aviasales

  7. #7 · Delta 675

    7:00 AM → 10:22 AM3h 22m nonstop

    Local times, typical schedule. Last flown 2026-05-06.

    76%

    chance on time

    On time (history)
    81%
    Cancelled
    3.6%
    Avg arrival delay
    14 min
    • Arrived on time 81% of the time (80 flights, Jun 2025 to May 2026).
    • Cancelled 3.6% of the time (3 of 83).
    • Leaves in this route's most on-time window (Before 9 AM: 89% on time; 3 to 6 PM: 55%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).

    Moderate track record · 80 flights

    Find Delta 675 fares Opens this date on Aviasales

  8. #8 · American 1565

    10:49 AM → 2:21 PM3h 32m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    75%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 82% of the time (11 flights, Jun 2025 to May 2026).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
    • 75% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 11 flights

    Find American 1565 fares Opens this date on Aviasales

  9. #9 · Delta 1399

    11:45 AM → 3:08 PM3h 23m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    71%

    chance on time

    On time (history)
    72%
    Cancelled
    0.9%
    Avg arrival delay
    23 min
    • Arrived on time 72% of the time (224 flights, Jun 2025 to May 2026).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Strong track record · 224 flights

    Find Delta 1399 fares Opens this date on Aviasales

  10. #10 · Delta 1596

    11:18 AM → 2:50 PM3h 32m nonstop

    Local times, typical schedule. Last flown 2026-05-06. Same departure also flew as Delta 1325; its record covers all of them.

    71%

    chance on time

    On time (history)
    72%
    Cancelled
    0.0%
    Avg arrival delay
    25 min
    • Arrived on time 72% of the time (60 flights, Jun 2025 to May 2026).
    • Never cancelled in 60 scheduled flights.
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 60 flights

    Find Delta 1596 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • American Airlines69%

    2,212 flights · 71% on time as flown · 1.9% cancel

  • JetBlue67%

    136 flights · 67% on time as flown · 3.0% cancel

  • Delta Air Lines67%

    886 flights · 69% on time as flown · 2.9% cancel

  • Spirit Airlines56%

    195 flights · 55% on time as flown · 4.5% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM89%

    706 flights · avg delay 8 min

  • 9 AM to noon75%

    726 flights · avg delay 17 min

  • Noon to 3 PM65%

    509 flights · avg delay 29 min

  • 3 to 6 PM55%

    380 flights · avg delay 33 min

  • 6 to 9 PM60%

    768 flights · avg delay 35 min

  • After 9 PM63%

    362 flights · avg delay 27 min

Best day: Wednesday (74%). Worst: Sunday (64%).

Smarter routing

Nearby airports that run more on time

  • FLL → ORH 73% chance on time

    Fort Lauderdale Hollywood International Airport to Worcester Regional Airport · 319 flights a year · 66 mi from your airports · yours: 68%

    Rank flightsFares

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
73
F
72
M
67
A
73
M
72
J
63
J
60
A
63
S
69
O
76
N
82
D
71

What delays this route

  • Late-arriving aircraft42%
  • Airline (crew, maintenance, boarding)32%
  • Air traffic control and airport volume23%
  • Severe weather3%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

MIA to BOS questions

What time of day is best to fly MIA to BOS?
Before 9 AM: 89% of flights arrived on time, against 55% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from MIA to BOS?
American, with a season-adjusted 69% chance of operating and arriving on time over 2,212 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on MIA to BOS?
July (60% on time); the best was November (82%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from MIA

Live status: FAA delays and ground stops