Carrier route record
YXBWI→BOS
Republic Airways · Baltimore to Boston
- Flights
- 1,086
- Period
- July 2025 to June 2026
- Share of route
- 31%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on BWI to BOS lands a B−, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 1,086 flights, with a median arrival 13 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Republic on BWI to BOS from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.8%
Arrivals under 15 minutes late, of 1,050 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
3.13%
National rate is 1.81%
Whole route
74.8%
Every carrier on BWI to BOS, 3,556 flights
These figures cover 1,086 flights between July 2025 and June 2026. Beyond the headline rate, 8.9% 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
Republic against every carrier on BWI to BOS
Republic flew 1,086 of the 3,556 flights on BWI to BOS, about 31% of it. Its 80.8% on time is 6 points better than the route as a whole, which runs 74.8%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 80.8% to Spirit at 68.5%. 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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways (this page) | 1,086 | 80.8% | 84 min | 3.13% | B− |
| Southwest Airlines | 2,372 | 72.4% | 63 min | 2.36% | C |
| Spirit Airlinesthin sample | 98 | 68.5% | 64 min | 6.12% | C− |
Flight by flight
Republic flight numbers on BWI to BOS
Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 38 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am154 flights93.5%
- 8am–11am190 flights89.7%
- 11am–2pm237 flights81.8%
- 2pm–5pm168 flights82.2%
- 5pm–8pm176 flights55.2%
- 8pm–5am161 flights81.6%
Scale runs 45% to 100%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 55.2% on time, against 93.5% for the 5am–8am 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 11am–2pm window is the busiest, with 237 flights scheduled in it.
Across the year
Republic on BWI to BOS through the year
Delays peak in September, when the on-time rate falls to 64.9%. March is the strongest month at 88.4%. Moving a flexible trip across that boundary buys 24 points. October was the busiest month here, with 107 flights.
Across the week, Saturday is the strongest day at 92.9% on time and Monday the weakest at 75.0%. 18 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Republic runs late on this route
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 17,000 reported delay minutes.
- 39%National Airspace System
- 35%Carrier
- 25%Late-arriving aircraft
- 2%Extreme weather
- 0%Security
The largest share of delay minutes, 35%, 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 5,913 of the 17,000 delay minutes reported here. The split is drawn from 17,020 reported delay minutes.
39% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 6,626 minutes out of 17,000, against a national NAS share of 21%.
Cancellations run at 3.13%, against 1.81% nationally. That is about one flight in 30 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
8.9% 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 an hour and a half, which a normal layover absorbs.
At 369 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg runs 81.9% on time across 1,086 flights, within about a point 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. 1,086 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 Republic on BWI to BOS
Put together: the delay figures matter less here than the 3.13% cancellation rate. A late arrival costs you an hour and a half; 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. 1,050 completed flights over 12 months sit behind that.
Related
Where to go next
- BWI to BOS, every carrier
- Republic on BOS to BWI, the return leg
- Southwest Airlines on BWI to BOS72.4%
- Republic Airways network-wide record
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Boston Logan International (BOS) delay statistics
- The US routes with the most cancellations
- The best time of day to fly, according to 7.04 million flight records
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.