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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

BOS → MIA

Boston to Miami: 3,454 nonstop flights a year

On time (12 months)

77%

Cancelled

2.3%

avg delay 18 min

Best time to leave

Before 9 AM

90% on time vs 60% 3 to 6 PM

Most reliable airline

American

79% chance on time

Check BOS to MIA fares

Lowest nonstop fare seen in the next two months: $75 (American 1284 on 2026-11-14). 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 1418

    5:00 AM → 8:31 AM3h 31m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 2591; its record covers all of them.

    93%

    chance on time

    On time (history)
    95%
    Cancelled
    2.2%
    Avg arrival delay
    3 min
    • Arrived on time 95% of the time (355 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 60%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 355 flights

    Find American 1418 fares Opens this date on Aviasales

  2. #2 · American 2980

    6:00 AM → 9:38 AM3h 38m nonstop

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

    91%

    chance on time

    On time (history)
    94%
    Cancelled
    2.4%
    Avg arrival delay
    4 min
    • Arrived on time 94% of the time (249 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 60%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 249 flights

    Find American 2980 fares Opens this date on Aviasales

  3. #3 · American 1259

    7:00 AM → 10:45 AM3h 45m nonstop

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

    86%

    chance on time

    On time (history)
    88%
    Cancelled
    2.2%
    Avg arrival delay
    10 min
    • Arrived on time 88% of the time (305 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 60%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 305 flights

    Find American 1259 fares Opens this date on Aviasales

  4. #4 · American 873

    8:45 AM → 12:24 PM3h 39m nonstop

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

    84%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    17 min
    • Arrived on time 85% of the time (172 flights, Jun 2025 to May 2026).
    • Never cancelled in 175 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 60%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Moderate track record · 172 flights

    Find American 873 fares Opens this date on Aviasales

  5. #5 · Delta 1399

    7:05 AM → 10:46 AM3h 33m nonstop

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

    82%

    chance on time

    On time (history)
    84%
    Cancelled
    2.0%
    Avg arrival delay
    15 min
    • Arrived on time 84% of the time (338 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 60%).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).

    Strong track record · 338 flights

    Find Delta 1399 fares Opens this date on Aviasales

  6. #6 · American 815

    10:56 AM → 2:29 PM3h 33m nonstop

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

    75%

    chance on time

    On time (history)
    77%
    Cancelled
    2.6%
    Avg arrival delay
    28 min
    • Arrived on time 77% of the time (183 flights, Jun 2025 to May 2026).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).
    • Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.

    Moderate track record · 183 flights

    Find American 815 fares Opens this date on Aviasales

  7. #7 · American 2247

    12:44 PM → 4:18 PM3h 34m nonstop

    Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as American 2031; its record covers all of them.

    73%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 73% of the time (201 flights, Jun 2025 to May 2026).
    • Never cancelled in 201 scheduled flights.
    • Departs inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
    • Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 201 flights

    Find American 2247 fares Opens this date on Aviasales

  8. #8 · American 1562

    6:00 PM → 9:46 PM3h 46m nonstop

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

    73%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    37 min
    • Arrived on time 73% of the time (11 flights, Jun 2025 to May 2026).
    • Departs outside BOS's trouble window (noon to 6 PM, when 79% of its 196 ground stops and delay programs started).
    • 93% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find American 1562 fares Opens this date on Aviasales

  9. #9 · American 1589

    1:45 PM → 5:18 PM3h 33m nonstop

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

    71%

    chance on time

    On time (history)
    64%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 64% of the time (11 flights, Jun 2025 to May 2026).
    • Departs inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
    • Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 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

  10. #10 · American 1909

    2:57 PM → 6:35 PM3h 39m nonstop

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

    68%

    chance on time

    On time (history)
    66%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 66% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
    • Lands inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.

    Limited track record · 44 flights

    Find American 1909 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • American Airlines79%

    2,213 flights · 81% on time as flown · 1.9% cancel

  • JetBlue71%

    136 flights · 70% on time as flown · 2.3% cancel

  • Delta Air Lines70%

    888 flights · 72% on time as flown · 2.7% cancel

  • Spirit Airlines58%

    196 flights · 56% on time as flown · 4.2% cancel

On time by departure time

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

  • Before 9 AM90%

    1,449 flights · avg delay 8 min

  • 9 AM to noon78%

    317 flights · avg delay 27 min

  • Noon to 3 PM71%

    448 flights · avg delay 19 min

  • 3 to 6 PM60%

    691 flights · avg delay 30 min

  • 6 to 9 PM65%

    548 flights · avg delay 25 min

Best day: Tuesday (82%). Worst: Sunday (73%).

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