Carrier route record
F9IAH→BWI
Frontier Airlines · Houston to Baltimore
- Flights
- 180
- Period
- September 2025 to August 2026
- Share of route
- 14%
- Carriers
- 4
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on IAH to BWI earns an F−, which is as low as this site's scale goes for a reason. Only 52.1% of flights arrive inside the 15-minute window, 25 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 180 flights, with a median arrival 12 minutes late.
The national on-time rate over the same period is 77.3%, so Frontier on IAH to BWI runs 25 points behind the country as a whole. Across a thousand flights that is about 252 extra late arrivals.
Key figures
On time
52.1%
Arrivals under 15 minutes late, of 165 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
7.78%
National rate is 1.89%
Whole route
77.3%
Every carrier on IAH to BWI, 1,308 flights
These figures cover 180 flights between September 2025 and August 2026. Beyond the headline rate, 18.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Frontier against every carrier on IAH to BWI
Frontier flew 180 of the 1,308 flights on IAH to BWI, about 14% of it. Its 52.1% on time is 25 points worse than the route as a whole, which runs 77.3%. Ranked by on-time rate it is last of four carriers on the route, where the range runs from SkyWest at 100.0% to Frontier at 52.1%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlinesthin sample | 2 | 100.0% | — | 0.00% | A+ |
| United Airlines | 831 | 81.3% | 60 min | 0.60% | B+ |
| Spirit Airlinesthin sample | 295 | 79.9% | 59 min | 2.03% | B |
| Frontier Airlines (this page)thin sample | 180 | 52.1% | 73 min | 7.78% | F− |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Frontier runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 180 flights.
There are not enough flights in each departure window to split Frontier's IAH to BWI record by time of day without the percentages moving on noise. The headline rate of 52.1% is the reliable figure here.
Across the year
Frontier on IAH to BWI through the year
- Oct–Dec 202515 flights—
- Jan–Mar 202628 flights—
- Apr–Jun 202675 flights52.8%
- Jul–Sep 202662 flights44.4%
Scale runs 35% to 60%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 52.1% on time across 180 flights.
Split by quarter, Frontier on IAH to BWI logged 15 flights in Oct–Dec 2025, 28 flights in Jan–Mar 2026, 75 flights in Apr–Jun 2026 and 62 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 52.1% annual figure is the one to use.
Across the week, Thursday is the strongest day at 72.2% on time and Sunday the weakest at 45.5%, a spread of 27 points.
Arrival by arrival
How late Frontier on IAH to BWI runs when it is late
The 79 late arrivals split 25 under half an hour, 24 between 30 and 60 minutes, and 30 an hour or more.
- 15+ min early22 flights13.3%
- Within 15 min64 flights38.8%
- 15–29 min late25 flights15.2%
- 30–59 min late24 flights14.5%
- 1–2 hours late20 flights12.1%
- 2+ hours late10 flights6.1%
Scale runs 0% to 100%.
Share of 165 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 61 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 23 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BWI.
The worst days
Worst days for Frontier on IAH to BWI
The latest arrival of the period was on 21 December 2025, 14 hours 16 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 December 2025 | 14 hours 16 minutes | Carrier |
| 24 May 2026 | 4 hours 24 minutes | Late-arriving aircraft |
| 5 July 2026 | 3 hours | Carrier |
| 16 January 2026 | 2 hours 54 minutes | Carrier |
| 3 August 2026 | 2 hours 43 minutes | Carrier |
Delay causes
Why Frontier runs late on this route
Carrier accounts for 44% of the 5,747 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 30%Late-arriving aircraft
- 22%National Airspace System
- 3%Extreme weather
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,539 of the 5,747 delay minutes reported here. The split is drawn from 5,747 reported delay minutes.
Cancellations run at 7.78%, against 1.89% nationally. That is about one flight in twelve cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
18.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,235 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 59.1% on time across 180 flights, 7 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 7 points of difference.
One caution: this is a thin sample. 180 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Frontier on IAH to BWI
Put together: the delay figures matter less here than the 7.78% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 2pm–5pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 165 completed flights over 12 months sit behind that.
Related
Where to go next
- IAH to BWI, every carrier
- Frontier on BWI to IAH, the return leg
- United Airlines on IAH to BWI81.3%
- Spirit Airlines on IAH to BWI79.9%
- Frontier Airlines network-wide record
- George Bush Intercontinental (IAH) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.