Route reliability record
BWI→JAX
Baltimore to Jacksonville
- Flights
- 1,401
- Period
- September 2025 to August 2026
- Distance
- 663 mi
- Carriers
- 1
This route lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That rests on 1,401 BWI to JAX flights, with a median arrival 2 minutes early.
Best time to fly BWI to JAX: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 88.7% of the time and Wednesday flights 81.2%, against 76.0% 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
76.0%
Arrivals under 15 minutes late, of 1,376 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
1.64%
National rate is 1.89%
Best carrier
Southwest
76.0% on time across 1,401 flights
These figures cover 1,401 flights between September 2025 and August 2026. The median arrival is 2 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 BWI to JAX
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 | 1,401 | 76.0% | 49 min | 1.64% | B |
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Best ways to make this trip
The most reliable ways to fly Baltimore to Jacksonville
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. IAD → JAXWashington to Jacksonville | United Airlines | 83.1% | 83.8% | 0.78% | 8am–11am, Wed (route) | UA 2084 09:00 |
| 2. BWI → JAXBaltimore to Jacksonville | Southwest Airlines | 74.8% | 76.0% | 1.64% | 8am–11am, Wed | — |
| 3. DCA → JAXWashington to Jacksonville | American Airlines | 71.1% | 72.7% | 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 25 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am395 flights88.7%
- 11am–2pm297 flights81.6%
- 2pm–5pm227 flights70.7%
- 5pm–8pm350 flights64.0%
- 8pm–5am132 flights65.3%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 64.0% on time, against 88.7% for the 8am–11am 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 8am–11am window is the busiest, with 395 flights scheduled in it.
Explore
Filter BWI to JAX 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 BWI to JAX, the best departure window is 8am–11am at 88.7% on time and the worst is 5pm–8pm at 64.0%, a wide gap of 24.7 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am88.7%
- 11am–2pm81.6%
- 2–5pm70.7%
- 5–8pm64.0%
- 8pm–5am65.3%
best all US flightsScale 55% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 20 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.
June is the worst month at 66.4% on time, 20 points below January, the best at 86.6%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. December was the busiest month here, with 134 flights.
Across the week, Wednesday is the strongest day at 81.2% on time and Monday the weakest at 72.1%, a spread of 9 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 16,000 reported delay minutes.
- 40%Late-arriving aircraft
- 38%Carrier
- 17%National Airspace System
- 4%Extreme weather
- 1%Security
40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 16,000 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 15,867 reported delay minutes.
The largest share of delay minutes, 38%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,972 of the 16,000 delay minutes reported here.
Cancellations sit at 1.64% against a national 1.89%, which is ordinary. Diversions add another 0.14%.
Connections and stage length
What a delay here actually costs
5.7% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 50 minutes, which a normal layover absorbs.
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 80.2% on time across 1,385 flights, 4 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 4 points of difference.
The sample behind these figures is 1,401 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 JAX 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. January runs 86.6% on time and June 66.4%, a swing of 20 points. If the dates move at all, move them out of June before you think about anything else. 1,376 completed flights over 12 months sit behind that.
Common questions
BWI to JAX questions
How often is BWI to JAX delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 24.0% of the 1,401 flights in this analysis, against 22.7% nationally. Delayed flights are late by roughly 50 minutes on average.
How reliable is BWI to JAX compared with the rest of the country?
76.0% of flights arrive on time here against a national 77.3%, a difference of about a point against it. That is worth a B on this site's grading scale.
What time of day has the fewest delays on BWI to JAX?
The 8am–11am departure window is the strongest at 88.7% on time. The 5pm–8pm window is the weakest at 64.0%, 25 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 June delays on BWI to JAX?
June is the weakest month at 66.4% on time, compared with 86.6% in January. Across the year that is 20 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
- JAX to BWI — the return legseparate record
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Jacksonville International (JAX) delay statistics
- BWI to ATL, a related route79.9%
- ATL to JAX, a related route75.1%
- BWI to MCO, a related route75.5%
- Southwest Airlines on-time record76.0%
- 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. BWI to JAX and JAX to BWI 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.