Route reliability record
JAX→BWI
Jacksonville to Baltimore
- Flights
- 1,385
- Period
- September 2025 to August 2026
- Distance
- 663 mi
- Carriers
- 1
This route lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about 55 minutes on average. That rests on 1,385 JAX to BWI flights, with a median arrival 5 minutes early.
Best time to fly JAX to BWI: a 5am–8am departure, ideally on a Friday. Flights in that window arrived on time 94.9% of the time and Friday flights 85.1%, against 80.2% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.2%
Arrivals under 15 minutes late, of 1,361 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
1.08%
National rate is 1.89%
Best carrier
Southwest
80.2% on time across 1,385 flights
These figures cover 1,385 flights between September 2025 and August 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Which airline is most reliable on JAX to BWI
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 |
|---|---|---|---|---|---|
| Southwest Airlines | 1,385 | 80.2% | 54 min | 1.08% | B |
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Best ways to make this trip
The most reliable ways to fly Jacksonville to Baltimore
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 3 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. JAX → IADJacksonville to Washington | United Airlines | 90.0% | 91.0% | 1.09% | 8am–11am, Thu (route) | — |
| 2. JAX → BWIJacksonville to Baltimore | Southwest Airlines | 79.3% | 80.2% | 1.08% | 5am–8am, Fri | — |
| 3. JAX → DCAJacksonville to Washington | American Airlines | 72.2% | 73.8% | 2.16% | 5am–8am, Sat | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 28 points, against half a point between the best and worst carrier.
- 5am–8am279 flights94.9%
- 8am–11am120 flights89.1%
- 11am–2pm371 flights85.6%
- 2pm–5pm209 flights71.9%
- 5pm–8pm391 flights66.6%
- 8pm–5am15 flights—
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 94.9% of the time, against 66.6% for the evening window. That is 28 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 391 flights scheduled in it.
Explore
Filter JAX to BWI by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On JAX to BWI, the best departure window is 5am–8am at 94.9% on time and the worst is 5pm–8pm at 66.6%, a wide gap of 28.3 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am94.9%
- 8–11am89.1%
- 11am–2pm85.6%
- 2–5pm71.9%
- 5–8pm66.6%
- 8pm–5am—
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 22 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
September is the best month on the calendar at 92.5% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. December was the busiest month here, with 134 flights.
Across the week, Friday is the strongest day at 85.1% on time and Sunday the weakest at 74.1%, a spread of 11 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 53% of the 15,000 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Late-arriving aircraft
- 24%Carrier
- 17%National Airspace System
- 6%Extreme weather
53% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 15,000 reported delay minutes here, that single category outweighs weather by 8 to one. The split is drawn from 14,582 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 94.9% on time here.
Cancellations sit at 1.08% against a national 1.89%, which is ordinary. Diversions add another 0.65%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.9% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 663 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 76.0% on time across 1,401 flights, 4 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 4 points of difference.
The sample behind these figures is 1,385 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in BWI after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 92.5% on time and May 70.9%, a swing of 22 points. If the dates move at all, move them out of May before you think about anything else. 1,361 completed flights over 12 months sit behind that.
Common questions
JAX to BWI questions
How often is JAX to BWI delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 19.8% of the 1,385 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 55 minutes on average.
How reliable is JAX to BWI compared with the rest of the country?
80.2% of flights arrive on time here against a national 77.3%, a difference of 3 points in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on JAX to BWI?
The 5am–8am departure window is the strongest at 94.9% on time. The 5pm–8pm window is the weakest at 66.6%, 28 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are May delays on JAX to BWI?
May is the weakest month at 70.9% on time, compared with 92.5% in September. Across the year that is 22 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- BWI to JAX — the return legseparate record
- Jacksonville International (JAX) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- JAX to ATL, a related route83.8%
- ATL to BWI, a related route75.2%
- JAX to ORD, a related route76.9%
- Southwest Airlines on-time record80.2%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. JAX to BWI and BWI to JAX are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.