Flight number record
YX 5644
Republic Airways · Boston to Baltimore
- Route
- BOS → BWI
- Departs
- 17:25
- Flights
- 330
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s YX 5644, check with Republic Airways. Republic Airways flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
YX 5644 lands a B−, about a point worse than the national rate of 77.6%. About one flight in four 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 330 flights, with a median arrival 8 minutes early.
Key figures
On time
76.4%
Arrivals under 15 minutes late, of 314 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
4.24%
National rate is 1.81%
1 hour+ late
8.9%
National rate is 8.1%
These figures cover 330 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.
Schedule
When YX 5644 flies
YX 5644 flies BOS to BWI without a single fixed slot. Its most common scheduled departure was 17:25, used on 70 of 330 flights, with 17:10 (40 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 17:2570 flights21.2%
- Departs 17:1040 flights12.1%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and YX 5644 runs 8 points better at 76.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
YX 5644 next to BOS to BWI
Every carrier on BOS to BWI combined arrived on time 78.9% of the time across 3,551 flights, so YX 5644 is 3 points behind it. Republic flew 1,086 flights on the same city pair under all its flight numbers, including this one, and those ran 81.9% on time. Across its whole network Republic Airways managed 78.5%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5644thin sample | 330 | 76.4% | 70 min | 4.24% | B− |
| All Republic Airways on BOS–BWI | 1,086 | 81.9% | 76 min | 3.31% | B− |
| All carriers on BOS–BWI | 3,551 | 78.9% | 73 min | 2.70% | B |
| Republic Airways, whole network | 361,482 | 78.5% | 72 min | 4.08% | B− |
Across the year
YX 5644 quarter by quarter
YX 5644 did not run the same all year. Its best quarter was Jan–Mar 2026 at 80.3% on time and its weakest Oct–Dec 2025 at 68.7%, a swing of 12 points on roughly 83 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202591 flights76.1%
- Oct–Dec 202570 flights68.7%
- Jan–Mar 202680 flights80.3%
- Apr–Jun 202689 flights79.5%
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, YX 5644 did best on Thursday at 91.1% on time and worst on Sunday at 63.6%. Each day rests on about 47 flights, so a gap of 27 points is worth noticing but could still narrow in another year.
Delay causes
Why YX 5644 runs late
One category carries most of the weight here. National Airspace System accounts for 42% of the 5,166 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 42%National Airspace System
- 28%Carrier
- 28%Late-arriving aircraft
- 1%Extreme weather
42% 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 2,192 minutes out of 5,166, against a national NAS share of 21%. The split is drawn from 5,166 delay minutes reported on YX 5644.
Cancellations run at 4.24%, against 1.81% 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 routes
What a delay on this flight 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 a little over an hour, which a normal layover absorbs.
YX 5644 is not only a BOS to BWI flight. It also flew BWI to BOS (302 flights, 65.5% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 330 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| BWI to BOSthin sample | 302 | 65.5% | 98 min | 5.96% | C− |
What to do with this
Booking YX 5644
For a booking, the cancellation rate is the figure to plan around on YX 5644: 4.24% of its 330 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to BWI, every carrier and departure
- BWI to BOS, the return direction
- Boston Logan International (BOS) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Republic Airways on-time record
- Every Republic Airways flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
A flight number here means Republic Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.