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Route on-time record

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

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Houston (George Bush Intercontinental Airport). 1,303 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 1.8% were cancelled. The most reliable flight number was United 204 at 8:10 AM.

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

BWI → IAH

Baltimore to Houston: 1,303 nonstop flights a year

On time (12 months)

79%

Cancelled

1.8%

avg delay 19 min

Best time to leave

Before 9 AM

91% on time vs 68% 6 to 9 PM

Most reliable airline

United

81% chance on time

Check BWI to IAH fares

Lowest nonstop fare seen in the next two months: $102 (Frontier 3067 on 2026-11-26). 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 204

    8:10 AM → 10:42 AM3h 32m nonstop

    Local times, typical schedule. Last flown 2026-04-29.

    91%

    chance on time

    On time (history)
    97%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 97% of the time (32 flights, Jun 2025 to May 2026).
    • Never cancelled in 32 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 68%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 32 flights

    Find United 204 fares Opens this date on Aviasales

  2. #2 · United 1898

    6:05 AM → 8:48 AM3h 35m nonstop

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

    90%

    chance on time

    On time (history)
    92%
    Cancelled
    3.0%
    Avg arrival delay
    6 min
    • Arrived on time 92% of the time (159 flights, Jun 2025 to May 2026).
    • Cancelled 3.0% of the time (5 of 164).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 68%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Moderate track record · 159 flights

    Find United 1898 fares Opens this date on Aviasales

  3. #3 · United 2194

    12:40 PM → 3:09 PM3h 30m nonstop

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

    88%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 88% of the time (51 flights, Jun 2025 to May 2026).
    • Never cancelled in 51 scheduled flights.
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 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 · 51 flights

    Find United 2194 fares Opens this date on Aviasales

  4. #4 · United 1362

    5:04 PM → 7:42 PM3h 38m nonstop

    Local times, typical schedule. Last flown 2026-03-27.

    77%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    35 min
    • Arrived on time 84% of the time (19 flights, Jun 2025 to May 2026).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (19 flights), so its score leans on the airline's record at this hour.

    Limited track record · 19 flights

    Find United 1362 fares Opens this date on Aviasales

  5. #5 · Spirit 466

    11:05 AM → 1:24 PM3h 19m nonstop

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

    69%

    chance on time

    On time (history)
    45%
    Cancelled
    0.0%
    Avg arrival delay
    19 min
    • Arrived on time 45% of the time (11 flights, Jun 2025 to May 2026).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 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.
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find Spirit 466 fares Opens this date on Aviasales

  6. #6 · United 2095

    5:50 PM → 8:13 PM3h 23m nonstop

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

    67%

    chance on time

    On time (history)
    57%
    Cancelled
    0.0%
    Avg arrival delay
    29 min
    • Arrived on time 57% of the time (58 flights, Jun 2025 to May 2026).
    • Never cancelled in 58 scheduled flights.
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (58 flights), so its score leans on the airline's record at this hour.

    Limited track record · 58 flights

    Find United 2095 fares Opens this date on Aviasales

  7. #7 · Frontier 3067

    5:17 PM → 7:55 PM3h 38m nonstop

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

    67%

    chance on time

    On time (history)
    69%
    Cancelled
    5.7%
    Avg arrival delay
    28 min
    • Arrived on time 69% of the time (83 flights, Jun 2025 to May 2026).
    • Cancelled 5.7% of the time (5 of 88).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • 55% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 83 flights

    Find Frontier 3067 fares Opens this date on Aviasales

  8. #8 · Spirit 1244

    7:40 PM → 10:00 PM3h 20m nonstop

    Local times, typical schedule. Last flown 2026-04-13.

    61%

    chance on time

    On time (history)
    63%
    Cancelled
    6.5%
    Avg arrival delay
    51 min
    • Arrived on time 63% of the time (87 flights, Jun 2025 to May 2026).
    • Cancelled 6.5% of the time (6 of 93).
    • Leaves in this route's least on-time window (6 to 9 PM: 68% on time; Before 9 AM: 91%).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.

    Moderate track record · 87 flights

    Find Spirit 1244 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines81%

    803 flights · 82% on time as flown · 1.2% cancel

  • Spirit Airlines74%

    411 flights · 76% on time as flown · 2.3% cancel

  • Frontier Airlines72%

    88 flights · 69% on time as flown · 3.3% cancel

On time by departure time

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

  • Before 9 AM91%

    429 flights · avg delay 9 min

  • 9 AM to noon82%

    133 flights · avg delay 21 min

  • Noon to 3 PM80%

    262 flights · avg delay 16 min

  • 3 to 6 PM69%

    229 flights · avg delay 23 min

  • 6 to 9 PM68%

    233 flights · avg delay 35 min

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

Smarter routing

Nearby airports that run more on time

  • IAD → IAH 82% chance on time

    Washington Dulles International Airport to George Bush Intercontinental Airport · 1,865 flights a year · 45 mi from your airports · yours: 78%

    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
83
F
88
M
86
A
76
M
70
J
70
J
69
A
79
S
85
O
91
N
85
D
81

What delays this route

  • Air traffic control and airport volume33%
  • Airline (crew, maintenance, boarding)33%
  • Late-arriving aircraft26%
  • Severe weather8%

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 BWI to IAH…

BWI to IAH questions

What time of day is best to fly BWI to IAH?
Before 9 AM: 91% of flights arrived on time, against 68% 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 BWI to IAH?
United, with a season-adjusted 81% chance of operating and arriving on time over 803 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 BWI to IAH?
July (69% on time); the best was October (91%), 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 BWI

Live status: FAA delays and ground stops