Carrier route record
YXPHL→BOS
Republic Airways · Philadelphia to Boston
- Flights
- 1,761
- Period
- July 2025 to June 2026
- Share of route
- 36%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on PHL 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 a little over an hour on average. That is a workable record, not a spotless one. That rests on 1,761 flights. The strongest carrier on the route with a full sample, JetBlue Airways, flew 892 at 72.8% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Republic on PHL 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
80.9%
Arrivals under 15 minutes late, of 1,705 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
3.18%
National rate is 1.81%
Whole route
75.2%
Every carrier on PHL to BOS, 4,956 flights
These figures cover 1,761 flights between July 2025 and June 2026. Beyond the headline rate, 9.4% 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 PHL to BOS
Republic flew 1,761 of the 4,956 flights on PHL to BOS, about 36% of it. Its 80.9% on time is 6 points better than the route as a whole, which runs 75.2%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from Frontier at 87.5% to American at 71.4%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: about a point separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 57 | 87.5% | 43 min | 1.75% | A |
| Republic Airways (this page) | 1,761 | 80.9% | 79 min | 3.18% | B− |
| JetBlue Airways | 892 | 72.8% | 74 min | 2.58% | C |
| American Airlines | 2,246 | 71.4% | 82 min | 2.89% | C |
No carrier stands out. JetBlue tops the table at 72.8%, about a point clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Republic flight numbers on PHL 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 30 points, against about a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am359 flights92.6%
- 8am–11am385 flights89.1%
- 11am–2pm421 flights79.0%
- 2pm–5pm237 flights76.7%
- 5pm–8pm330 flights63.0%
- 8pm–5am29 flights—
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 63.0% on time, against 92.6% 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 11am–2pm window is the busiest, with 421 flights scheduled in it.
Across the year
Republic on PHL to BOS through the year
May is the best month on the calendar at 87.7% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 212 flights.
Across the week, Saturday is the strongest day at 89.2% on time and Monday the weakest at 75.1%. 14 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 26,000 reported delay minutes.
- 37%National Airspace System
- 28%Late-arriving aircraft
- 27%Carrier
- 8%Extreme weather
37% 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 9,550 minutes out of 26,000, against a national NAS share of 21%. The split is drawn from 25,700 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 92.6% on time here.
Cancellations run at 3.18%, 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.4% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
At 280 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 79.1% on time across 1,763 flights, within 2 points 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 1,761 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 PHL to BOS
Put together: the delay figures matter less here than the 3.18% cancellation rate. A late arrival costs you a little over 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. 1,705 completed flights over 12 months sit behind that.
Related
Where to go next
- PHL to BOS, every carrier
- Republic on BOS to PHL, the return leg
- JetBlue Airways on PHL to BOS72.8%
- American Airlines on PHL to BOS71.4%
- Republic Airways network-wide record
- Philadelphia International (PHL) 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.