Carrier route record
YXBOS→BWI
Republic Airways · Boston to Baltimore
- Flights
- 1,099
- Period
- September 2025 to August 2026
- Share of route
- 31%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Republic Airways.
Republic on BOS to BWI carries a cancellation problem, not just a delay problem: 4.3% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, about four flights in five arrive on time, worth a B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,099 flights, with a median arrival 11 minutes early.
Set against the rest of the country, Republic's BOS to BWI record is 5 points better than the US average of 77.3%. That gap is worth roughly 45 fewer late arrivals for every thousand flights.
Key figures
On time
81.8%
Arrivals under 15 minutes late, of 1,049 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
4.28%
National rate is 1.89%
Whole route
78.3%
Every carrier on BOS to BWI, 3,536 flights
These figures cover 1,099 flights between September 2025 and August 2026. The median arrival is 11 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
Republic against every carrier on BOS to BWI
Republic flew 1,099 of the 3,536 flights on BOS to BWI, about 31% of it. Its 81.8% on time is 4 points better than the route as a whole, which runs 78.3%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 81.8% to Spirit at 75.0%. 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) | 1,099 | 81.8% | 68 min | 4.28% | B− |
| Southwest Airlines | 2,413 | 76.8% | 67 min | 2.32% | B |
| Spirit Airlinesthin sample | 24 | 75.0% | 78 min | 0.00% | B+ |
Flight by flight
Republic flight numbers on BOS to BWI
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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 39 points, against half a point between the best and worst carrier.
- 5am–8am122 flights96.6%
- 8am–11am252 flights89.4%
- 11am–2pm235 flights84.6%
- 2pm–5pm173 flights78.0%
- 5pm–8pm196 flights76.5%
- 8pm–5am121 flights57.7%
Scale runs 50% to 100%.
The 8pm–5am window is where this operation falls apart: 57.7% on time, against 96.6% 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 8am–11am window is the busiest, with 252 flights scheduled in it.
Across the year
Republic on BOS to BWI through the year
July is the worst month at 73.5% on time, 14 points below August, the best at 87.3%. 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. July was the busiest month here, with 112 flights.
Across the week, Thursday is the strongest day at 86.7% on time and Monday the weakest at 74.1%, a spread of 13 points.
Arrival by arrival
How late Republic on BOS to BWI runs when it is late
Republic on BOS to BWI often beats the schedule: 445 of 1,049 completed flights, 42%, arrived 15 minutes or more early. The 191 late arrivals split 62 under half an hour, 58 between 30 and 60 minutes, and 71 an hour or more.
- 15+ min early445 flights42.4%
- Within 15 min413 flights39.4%
- 15–29 min late62 flights5.9%
- 30–59 min late58 flights5.5%
- 1–2 hours late47 flights4.5%
- 2+ hours late24 flights2.3%
Scale runs 0% to 100%.
Share of 1,049 completed flights by arrival against schedule.
29 of 190 late departures made up the time and arrived on time, 15% of them. 30 flights left on time and still arrived late.
The worst days
Worst days for Republic on BOS to BWI
The latest arrival of the period was on 31 October 2025, 13 hours 8 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 October 2025 | 13 hours 8 minutes | National Airspace System |
| 18 September 2025 | 9 hours 57 minutes | Carrier |
| 22 February 2026 | 5 hours 9 minutes | Carrier |
| 27 December 2025 | 4 hours 50 minutes | Carrier |
| 4 November 2025 | 4 hours 24 minutes | Carrier |
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 13,000 reported delay minutes.
- 39%Late-arriving aircraft
- 39%Carrier
- 22%National Airspace System
- 1%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 13,000 reported delay minutes here, that single category outweighs weather by 39 to one. The split is drawn from 12,941 reported delay minutes.
The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,012 of the 13,000 delay minutes reported here.
Cancellations run at 4.28%, against 1.89% nationally. That is about one flight in 25 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
6.8% 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 about an hour, 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 80.5% on time across 1,099 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.
The sample behind these figures is 1,099 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.
What to do with this
Booking Republic on BOS to BWI
Put together: the delay figures matter less here than the 4.28% 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. 1,049 completed flights over 12 months sit behind that.
Related
Where to go next
- BOS to BWI, every carrier
- Republic on BWI to BOS, the return leg
- Southwest Airlines on BOS to BWI76.8%
- Republic Airways network-wide record
- Boston Logan International (BOS) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.