Skip to content

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Your shortcuts, saved on this device. Search to add an airport.

No airports saved yet. Add the fields you visit most.

Ask ATIS

Route on-time record

PHL to IAH: most on-time flights and the best time to fly

Philadelphia (Philadelphia International Airport) to Houston (George Bush Intercontinental Airport). 1,803 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 2.1% were cancelled. The most reliable flight number was United 2038 at 12:55 PM.

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

Find me the most reliable flights fromtoonreturning(optional)

PHL → IAH

Philadelphia to Houston: 1,803 nonstop flights a year

On time (12 months)

80%

Cancelled

2.1%

avg delay 17 min

Best time to leave

Before 9 AM

86% on time vs 72% 6 to 9 PM

Most reliable airline

United

85% chance on time

Check PHL to IAH fares

Lowest nonstop fare seen in the next two months: $271 (American 2196 on 2026-10-30). 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 · United 2038

    12:55 PM → 3:40 PM3h 46m nonstop

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

    89%

    chance on time

    On time (history)
    92%
    Cancelled
    1.0%
    Avg arrival delay
    7 min
    • Arrived on time 92% of the time (98 flights, Jun 2025 to May 2026).
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).
    • Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Moderate track record · 98 flights

    Find United 2038 fares Opens this date on Aviasales

  2. #2 · United 584

    8:00 AM → 10:46 AM3h 46m nonstop

    Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as United 1172; its record covers all of them.

    88%

    chance on time

    On time (history)
    90%
    Cancelled
    1.2%
    Avg arrival delay
    4 min
    • Arrived on time 90% of the time (83 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 72%).
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).

    Moderate track record · 83 flights

    Find United 584 fares Opens this date on Aviasales

  3. #3 · American 2153

    10:45 AM → 1:39 PM3h 54m nonstop

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

    82%

    chance on time

    On time (history)
    86%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 86% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).
    • Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Limited track record · 44 flights

    Find American 2153 fares Opens this date on Aviasales

  4. #4 · United 2648

    7:59 PM → 10:45 PM3h 46m nonstop

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

    81%

    chance on time

    On time (history)
    75%
    Cancelled
    4.8%
    Avg arrival delay
    69 min
    • Arrived on time 75% of the time (20 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 72% on time; Before 9 AM: 86%).
    • Departs inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 20 flights

    Find United 2648 fares Opens this date on Aviasales

  5. #5 · American 1927

    8:56 AM → 11:40 AM3h 44m nonstop

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

    77%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    23 min
    • Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 72%).
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).
    • 51% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 8 flights

    Find American 1927 fares Opens this date on Aviasales

  6. #6 · American 1925

    1:05 PM → 3:46 PM3h 41m nonstop

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

    77%

    chance on time

    On time (history)
    80%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 80% of the time (10 flights, Jun 2025 to May 2026).
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).
    • Lands inside IAH's trouble window: 60% of its 92 ground stops and delay programs started between noon and 6 PM.

    Limited track record · 10 flights

    Find American 1925 fares Opens this date on Aviasales

  7. #7 · American 699

    5:48 PM → 8:42 PM3h 54m nonstop

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

    68%

    chance on time

    On time (history)
    66%
    Cancelled
    0.0%
    Avg arrival delay
    27 min
    • Arrived on time 66% of the time (44 flights, Jun 2025 to May 2026).
    • Never cancelled in 44 scheduled flights.
    • Departs inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 44 flights

    Find American 699 fares Opens this date on Aviasales

  8. #8 · Frontier 2153

    3:29 PM → 6:21 PM3h 52m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    65%

    chance on time

    On time (history)
    69%
    Cancelled
    1.8%
    Avg arrival delay
    22 min
    • Arrived on time 69% of the time (54 flights, Jun 2025 to May 2026).
    • Departs inside PHL's trouble window: 72% of its 95 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 54 flights

    Find Frontier 2153 fares Opens this date on Aviasales

  9. #9 · American 3021

    9:34 PM → 12:29 AM3h 55m nonstop

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

    58%

    chance on time

    On time (history)
    45%
    Cancelled
    7.0%
    Avg arrival delay
    59 min
    • Arrived on time 45% of the time (66 flights, Jun 2025 to May 2026).
    • Cancelled 7.0% of the time (5 of 71).
    • Departs outside PHL's trouble window (2 PM to 8 PM, when 72% of its 95 ground stops and delay programs started).

    Moderate track record · 66 flights

    Find American 3021 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines85%

    881 flights · 87% on time as flown · 1.3% cancel

  • American Airlines72%

    707 flights · 73% on time as flown · 2.8% cancel

  • Frontier Airlines72%

    55 flights · 69% on time as flown · 2.0% cancel

On time by departure time

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

  • Before 9 AM86%

    555 flights · avg delay 9 min

  • 9 AM to noon78%

    228 flights · avg delay 20 min

  • Noon to 3 PM84%

    347 flights · avg delay 11 min

  • 3 to 6 PM75%

    222 flights · avg delay 21 min

  • 6 to 9 PM72%

    407 flights · avg delay 27 min

Best day: Tuesday (83%). Worst: Monday (76%).

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
77
F
88
M
85
A
84
M
70
J
70
J
64
A
74
S
81
O
89
N
86
D
79

What delays this route

  • Late-arriving aircraft35%
  • Airline (crew, maintenance, boarding)32%
  • Air traffic control and airport volume28%
  • Severe weather5%

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

Finding the most reliable connections from PHL to IAH…

PHL to IAH questions

What time of day is best to fly PHL to IAH?
Before 9 AM: 86% of flights arrived on time, against 72% for departures 6 to 9 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 PHL to IAH?
United, with a season-adjusted 85% chance of operating and arriving on time over 881 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 PHL to IAH?
July (64% on time); the best was October (89%), 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 PHL

Most on-time flights from PHL on every route →

Live status: FAA delays and ground stops