Carrier route record

F9BWI→IAH

Frontier Airlines · Baltimore to Houston

Flights: 118
Period: July 2025 to June 2026
Share of route: 9%
Carriers: 4

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.

Frontier on BWI to IAH draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 118 flights. The strongest carrier on the route with a full sample, United Airlines, flew 816 at 83.2% on time.

The national on-time rate over the same period is 77.6%, so Frontier on BWI to IAH runs 11 points behind the country as a whole. Across a thousand flights that is about 112 extra late arrivals.

On time

66.4%

Arrivals under 15 minutes late, of 113 completed flights

Avg delay

77 min

Across delayed arrivals only, not all flights

Cancelled

4.24%

National rate is 1.81%

Whole route

79.8%

Every carrier on BWI to IAH, 1,311 flights

These figures cover 118 flights between July 2025 and June 2026. Beyond the headline rate, 11.5% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Carrier by carrier

Frontier against every carrier on BWI to IAH

Frontier flew 118 of the 1,311 flights on BWI to IAH, about 9% of it. Its 66.4% on time is 13 points worse than the route as a whole, which runs 79.8%. 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 66.4%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. United Airlines arrives on time 83.2% of the time; Spirit Airlines manages 76.5%. Sample sizes sit next to every figure, because a two-point gap across 376 flights means less than a ten-point one.

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	816	83.2%	80 min	1.10%	B
Spirit Airlines	376	76.5%	108 min	2.66%	B
Frontier Airlines (this page)thin sample	118	66.4%	77 min	4.24%	C−

United leads Spirit by 7 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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 118 flights.

There are not enough flights in each departure window to split Frontier's BWI to IAH record by time of day without the percentages moving on noise. The headline rate of 66.4% is the reliable figure here.

Across the year

Frontier on BWI to IAH through the year

Oct–Dec 202515 flights—
Jan–Mar 202628 flights—
Apr–Jun 202675 flights58.1%

Scale runs 50% 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 66.4% on time across 118 flights.

Split by quarter, Frontier on BWI to IAH logged 15 flights in Oct–Dec 2025, 28 flights in Jan–Mar 2026 and 75 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 66.4% annual figure is the one to use.

Delay causes

Why Frontier runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 55% of the 2,929 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
55%
National Airspace System
23%
Carrier
21%
Extreme weather
0%

55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,929 reported delay minutes here, that single category outweighs weather by 55 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,929 reported delay minutes.

Cancellations run at 4.24%, against 1.81% nationally. That is about one flight in 25 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.5% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg is a different operation and performs like one: it runs 55.9% on time across 118 flights, 11 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 11 points of difference.

One caution: this is a thin sample. 118 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 4.24% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5pm–8pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 113 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures