Carrier route record

F9IAH→BWI

Frontier Airlines · Houston to Baltimore

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 IAH to BWI earns a D−, which is as low as this site's scale goes for a reason. Only 55.9% of flights arrive inside the 15-minute window, 22 points worse than the national rate of 77.6%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 118 flights. The strongest carrier on the route with a full sample, United Airlines, flew 814 at 77.9% on time.

The national on-time rate over the same period is 77.6%, so Frontier on IAH to BWI runs 22 points behind the country as a whole. Across a thousand flights that is about 217 extra late arrivals.

On time

55.9%

Arrivals under 15 minutes late, of 111 completed flights

Avg delay

74 min

Across delayed arrivals only, not all flights

Cancelled

5.08%

National rate is 1.81%

Whole route

75.8%

Every carrier on IAH to BWI, 1,311 flights

These figures cover 118 flights between July 2025 and June 2026. Beyond the headline rate, 13.5% 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 IAH to BWI

Frontier flew 118 of the 1,311 flights on IAH to BWI, about 9% of it. Its 55.9% on time is 20 points worse than the route as a whole, which runs 75.8%. 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 55.9%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The two carriers here are closely matched: about a point separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on IAH to BWI
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlinesthin sample	2	100.0%	—	0.00%	A+
United Airlines	814	77.9%	62 min	0.61%	B+
Spirit Airlines	377	77.0%	59 min	2.12%	B
Frontier Airlines (this page)thin sample	118	55.9%	74 min	5.08%	D−

No carrier stands out. United tops the table at 77.9%, about a point clear of the bottom, which is inside the range this kind of sample moves year to year.

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 IAH to BWI record by time of day without the percentages moving on noise. The headline rate of 55.9% 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%

Scale runs 45% 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 55.9% on time across 118 flights.

Split by quarter, Frontier on IAH to BWI 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 55.9% annual figure is the one to use.

Delay causes

Why Frontier runs late on this route

One category carries most of the weight here. Carrier accounts for 48% of the 3,617 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.

Carrier
48%
Late-arriving aircraft
33%
National Airspace System
18%
Extreme weather
1%

The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,731 of the 3,617 delay minutes reported here. The split is drawn from 3,617 reported delay minutes.

Cancellations run at 5.08%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.5% 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 66.4% on time across 118 flights, 11 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 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 IAH to BWI

Put together: the delay figures matter less here than the 5.08% 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. 111 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