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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.

MIA → PHL

Miami to Philadelphia: 3,096 nonstop flights a year

On time (12 months)

75%

Cancelled

2.1%

avg delay 21 min

Best time to leave

Before 9 AM

91% on time vs 65% 3 to 6 PM

Most reliable airline

American

74% chance on time

Check MIA to PHL fares

Lowest nonstop fare seen in the next two months: $77 (Frontier 4954 on 2026-10-29). 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 2129

    6:45 AM → 9:41 AM2h 56m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1765; its record covers all of them.

    92%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 93% of the time (134 flights, Jun 2025 to May 2026).
    • Never cancelled in 134 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 65%).
    • 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 · 134 flights

    Find American 2129 fares Opens this date on Aviasales

  2. #2 · American 1079

    8:31 AM → 11:29 AM2h 58m nonstop

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

    87%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    14 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: 91% on time; 3 to 6 PM: 65%).
    • 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 1079 fares Opens this date on Aviasales

  3. #3 · American 2323

    8:49 AM → 11:42 AM2h 53m nonstop

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

    85%

    chance on time

    On time (history)
    88%
    Cancelled
    4.5%
    Avg arrival delay
    12 min
    • Arrived on time 88% of the time (104 flights, Jun 2025 to May 2026).
    • Cancelled 4.5% of the time (5 of 110).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 65%).
    • 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 · 104 flights

    Find American 2323 fares Opens this date on Aviasales

  4. #4 · American 551

    8:40 AM → 11:36 AM2h 56m nonstop

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

    85%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    26 min
    • Arrived on time 85% of the time (156 flights, Jun 2025 to May 2026).
    • Never cancelled in 156 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 65%).
    • 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 · 156 flights

    Find American 551 fares Opens this date on Aviasales

  5. #5 · American 2124

    7:05 AM → 10:01 AM2h 56m nonstop

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

    85%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    2 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: 91% on time; 3 to 6 PM: 65%).
    • 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 2124 fares Opens this date on Aviasales

  6. #6 · Spirit 269

    8:12 AM → 10:54 AM2h 42m nonstop

    Local times, typical schedule. Last flown 2026-05-01.

    83%

    chance on time

    On time (history)
    90%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 90% of the time (10 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 65%).
    • Departs outside MIA's trouble window (1 PM to 7 PM, when 49% of its 45 ground stops and delay programs started).
    • Short track record (10 flights), so its score leans on the airline's record at this hour.

    Limited track record · 10 flights

    Find Spirit 269 fares Opens this date on Aviasales

  7. #7 · American 1797

    9:40 AM → 12:30 PM2h 50m nonstop

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

    77%

    chance on time

    On time (history)
    67%
    Cancelled
    0.0%
    Avg arrival delay
    71 min
    • Arrived on time 67% of the time (9 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).
    • 73% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (9 flights), so its score leans on the airline's record at this hour.

    Limited track record · 9 flights

    Find American 1797 fares Opens this date on Aviasales

  8. #8 · Frontier 3380

    7:30 AM → 10:26 AM2h 57m nonstop

    Local times, typical schedule. Last flown 2026-05-04.

    74%

    chance on time

    On time (history)
    75%
    Cancelled
    3.1%
    Avg arrival delay
    25 min
    • Arrived on time 75% of the time (95 flights, Jun 2025 to May 2026).
    • Cancelled 3.1% of the time (3 of 98).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 65%).
    • 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 · 95 flights

    Find Frontier 3380 fares Opens this date on Aviasales

  9. #9 · American 1684

    1:50 PM → 4:48 PM2h 58m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as American 1284; its record covers all of them.

    73%

    chance on time

    On time (history)
    76%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 76% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Departs inside MIA's trouble window: 49% of its 45 ground stops and delay programs started between 1 PM and 7 PM.
    • Lands inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 55 flights

    Find American 1684 fares Opens this date on Aviasales

  10. #10 · American 3061

    7:45 PM → 10:44 PM2h 59m nonstop

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

    73%

    chance on time

    On time (history)
    74%
    Cancelled
    2.4%
    Avg arrival delay
    18 min
    • Arrived on time 74% of the time (203 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).

    Strong track record · 203 flights

    Find American 3061 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • American Airlines74%

    2,489 flights · 76% on time as flown · 1.9% cancel

  • Spirit Airlines72%

    258 flights · 74% on time as flown · 3.2% cancel

  • Frontier Airlines71%

    349 flights · 72% on time as flown · 2.2% cancel

On time by departure time

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

  • Before 9 AM91%

    732 flights · avg delay 9 min

  • 9 AM to noon79%

    228 flights · avg delay 26 min

  • Noon to 3 PM71%

    518 flights · avg delay 22 min

  • 3 to 6 PM65%

    525 flights · avg delay 30 min

  • 6 to 9 PM72%

    579 flights · avg delay 21 min

  • After 9 PM69%

    514 flights · avg delay 24 min

Best day: Wednesday (77%). Worst: Sunday (69%).

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