IAH to BWI flight delays & on-time performance
Nonstop flights from George Bush Intercontinental Airport to Baltimore/Washington International Thurgood Marshall Airport · 1,235 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAH or BWI right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (IAH) to Baltimore (BWI) arrived on time 76% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.4% were cancelled, and 8% arrived an hour or more late.
- United Airlines was the most punctual airline here (80% on time); Frontier Airlines was the least (52%).
- Departures scheduled around 7am did best (88% on time); around 4pm did worst (37%).
- Wednesday was the most reliable day to fly (82% on time) and Sunday the least (69%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (41%).
Which airline is most on time from IAH to BWI?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 100% | 0.0% | 1 min | 0.0% | 2 |
| United Airlines | 80% | 0.6% | 14 min | 6.7% | 828 |
| Spirit Airlines | 78% | 1.8% | 14 min | 8.0% | 332 |
| Frontier Airlines | 52% | 5.4% | 36 min | 17.9% | 149 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am76%99 flights
- 6am83%145 flights
- 7am88%164 flights
- 11am84%38 flights
- 12pm85%338 flights
- 3pm92%25 flights
- 4pm37%90 flights
- 6pm69%321 flights
- 7pm70%54 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday71%2.7% cancelled
- Tuesday81%0.6% cancelled
- Wednesday82%0.5% cancelled
- Thursday81%0.5% cancelled
- Friday76%1.9% cancelled
- Saturday74%0.6% cancelled
- Sunday69%3.2% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)41%
- Late-arriving aircraft32%
- Air traffic control & airport congestion22%
- Extreme weather4%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather58%
- Airline (crew, maintenance, cleaning, fueling)42%
- Air traffic control & airport congestion0%
- Security0%
IAH to BWI: common questions
- How often are IAH to BWI flights on time?
- 76% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Houston to Baltimore cancelled?
- 1.4% of scheduled flights were cancelled (19 of 1,311).
- How long are typical delays?
- Across all flights the average arrival delay was 16 min (early arrivals count as zero). Flights that were late arrived 64 min behind schedule on average, and 8.2% of flights were an hour or more late.
- How long is taxi time at IAH?
- Flights on this route spent 21 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BWI to IAH — 79% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAH → BWI, nonstop flights by US airlines that report to the DOT. How we calculate this.