Carrier route record

F9BWI→IAH

Frontier Airlines · Baltimore to Houston

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 BWI to IAH draws a D−. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 180 flights, with a median arrival 6 minutes late.

The national on-time rate over the same period is 77.3%, so Frontier on BWI to IAH runs 18 points behind the country as a whole. Across a thousand flights that is about 182 extra late arrivals.

On time

59.1%

Arrivals under 15 minutes late, of 171 completed flights

Avg delay

90 min

Across delayed arrivals only, not all flights

Cancelled

5.00%

National rate is 1.89%

Whole route

78.3%

Every carrier on BWI to IAH, 1,307 flights

These figures cover 180 flights between September 2025 and August 2026. Beyond the headline rate, 16.4% 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 BWI to IAH

Frontier flew 180 of the 1,307 flights on BWI to IAH, about 14% of it. Its 59.1% on time is 19 points worse than the route as a whole, which runs 78.3%. 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 59.1%. 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.

On-time performance by carrier on BWI to IAH
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlinesthin sample	1	100.0%	—	0.00%	A+
United Airlines	833	84.0%	68 min	1.20%	B
Spirit Airlinesthin sample	293	73.3%	103 min	2.73%	C
Frontier Airlines (this page)thin sample	180	59.1%	90 min	5.00%	D−

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 matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against half a point between the best and worst carrier.

5am–8am3 flights—
8am–11am—
11am–2pm43 flights72.1%
2pm–5pm70 flights53.0%
5pm–8pm39 flights51.3%
8pm–5am25 flights—

Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 51.3% on time, against 72.1% for the 11am–2pm slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 2pm–5pm window is the busiest, with 70 flights scheduled in it.

Across the year

Frontier on BWI to IAH through the year

Oct–Dec 202515 flights—
Jan–Mar 202628 flights—
Apr–Jun 202675 flights58.1%
Jul–Sep 202662 flights44.8%

Scale runs 35% to 65%. 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 59.1% on time across 180 flights.

Split by quarter, Frontier on BWI to IAH 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 59.1% annual figure is the one to use.

Across the week, Thursday is the strongest day at 77.8% on time and Sunday the weakest at 58.8%, a spread of 19 points.

Arrival by arrival

How late Frontier on BWI to IAH runs when it is late

Frontier on BWI to IAH often beats the schedule: 45 of 171 completed flights, 26%, arrived 15 minutes or more early. The 70 late arrivals split 21 under half an hour, 21 between 30 and 60 minutes, and 28 an hour or more.

15+ min early45 flights26.3%
Within 15 min56 flights32.7%
15–29 min late21 flights12.3%
30–59 min late21 flights12.3%
1–2 hours late12 flights7.0%
2+ hours late16 flights9.4%

Scale runs 0% to 100%.

Share of 171 completed flights by arrival against schedule.

18 of 72 late departures made up the time and arrived on time, 25% of them. In the other direction, 16 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 IAH.

The worst days

Worst days for Frontier on BWI to IAH

The latest arrival of the period was on 18 July 2026, 16 hours 48 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as a late-arriving aircraft.

The latest arrivals of Frontier on BWI to IAH in the period
Date	Arrived late by	Largest filed cause
18 July 2026	16 hours 48 minutes	National Airspace System
30 November 2025	9 hours 11 minutes	Carrier
22 July 2026	4 hours 37 minutes	Late-arriving aircraft
2 August 2026	4 hours 6 minutes	Late-arriving aircraft
24 May 2026	3 hours 52 minutes	Late-arriving aircraft

Delay causes

Why Frontier runs late on this route

Late-arriving aircraft accounts for 46% of the 6,291 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
46%
National Airspace System
39%
Carrier
14%
Extreme weather
1%

46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,291 reported delay minutes here, that single category outweighs weather by 42 to one. The split is drawn from 6,291 reported delay minutes.

39% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,442 minutes out of 6,291, against a national NAS share of 21%.

Cancellations run at 5.00%, against 1.89% nationally. That is about one flight in twenty 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

16.4% 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 52.1% on time across 180 flights, 7 points below 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 BWI to IAH

Put together: the delay figures matter less here than the 5.00% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 171 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures