Carrier route record

NKBWI→SJU

Spirit Airlines · Baltimore to San Juan

Flights: 205
Period: July 2025 to June 2026
Share of route: 17%
Carriers: 3

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

Spirit on BWI to SJU sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 205 flights, with a median arrival 2 minutes late.

The national on-time rate over the same period is 77.6%, so Spirit on BWI to SJU runs 6 points behind the country as a whole. Across a thousand flights that is about 61 extra late arrivals.

On time

71.5%

Arrivals under 15 minutes late, of 193 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

5.85%

National rate is 1.81%

Whole route

66.6%

Every carrier on BWI to SJU, 1,183 flights

These figures cover 205 flights between July 2025 and June 2026. Beyond the headline rate, 8.3% 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

Spirit against every carrier on BWI to SJU

Spirit flew 205 of the 1,183 flights on BWI to SJU, about 17% of it. Its 71.5% on time is 5 points better than the route as a whole, which runs 66.6%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Spirit at 71.5% to Frontier at 52.7%. One 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 SJU
Airline	Flights	On time	Avg delay	Cancelled	Grade
Spirit Airlines (this page)thin sample	205	71.5%	66 min	5.85%	C−
Southwest Airlines	821	67.9%	56 min	0.85%	C+
Frontier Airlinesthin sample	157	52.7%	114 min	7.01%	F−

Departure window

When Spirit 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 205 flights.

5am–8am130 flights74.4%
8am–11am8 flights—
11am–2pm33 flights65.6%
2pm–5pm10 flights—
5pm–8pm8 flights—
8pm–5am16 flights—

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

The weak window here is the middle of the day, not the evening: 11am–2pm runs 65.6% on time against 74.4% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 5am–8am window is the busiest, with 130 flights scheduled in it.

Across the year

Spirit on BWI to SJU through the year

Jul–Sep 202560 flights58.6%
Oct–Dec 202536 flights69.4%
Jan–Mar 202680 flights77.5%
Apr–Jun 202629 flights—

Scale runs 50% to 85%. 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 71.5% on time across 205 flights.

Spirit on BWI to SJU did not run the same all year. Its best quarter was Jan–Mar 2026 at 77.5% on time and its weakest Jul–Sep 2025 at 58.6%, a swing of 19 points on roughly 68 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Delay causes

Why Spirit runs late on this route

One category carries most of the weight here. Carrier accounts for 58% of the 3,622 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
58%
National Airspace System
30%
Extreme weather
8%
Late-arriving aircraft
4%
Security
0%

The largest share of delay minutes, 58%, 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 2,112 of the 3,622 delay minutes reported here. The split is drawn from 3,622 reported delay minutes.

Cancellations run at 5.85%, against 1.81% nationally. That is roughly one flight in fifteen 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

8.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

At 1,565 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The return leg runs 74.3% on time across 205 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 205 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 Spirit on BWI to SJU

Put together: the delay figures matter less here than the 5.85% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 193 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