Flight number record
YX 5644
Republic Airways · Boston to Baltimore
- Route
- BOS → BWI
- Departs
- 17:25
- Flights
- 331
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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−, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 331 flights, with a median arrival 8 minutes early.
Key figures
On time
76.7%
Arrivals under 15 minutes late, of 309 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
6.04%
National rate is 1.89%
1 hour+ late
8.4%
National rate is 8.3%
These figures cover 331 flights between September 2025 and August 2026. Beyond the headline rate, 8.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 64 of 331 flights, with 15:50 (49 flights) and 17:10 (44 flights) next.
- Departs 17:2564 flights19.3%
- Departs 15:5049 flights14.8%
- Departs 17:1044 flights13.3%
Scale runs 0% to 100%.
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 68.0%, and YX 5644 runs 9 points better at 76.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
YX 5644 next to BOS to BWI
Every carrier on BOS to BWI combined arrived on time 78.3% of the time across 3,536 flights, so YX 5644 is 2 points behind it. Republic flew 1,099 flights on the same city pair under all its flight numbers, including this one, and those ran 81.8% on time. Across its whole network Republic Airways managed 78.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5644thin sample | 331 | 76.7% | 59 min | 6.04% | B− |
| All Republic Airways on BOS–BWI | 1,099 | 81.8% | 68 min | 4.28% | B− |
| All carriers on BOS–BWI | 3,536 | 78.3% | 67 min | 2.91% | B |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | 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 202530 flights—
- Oct–Dec 202570 flights68.7%
- Jan–Mar 202680 flights80.3%
- Apr–Jun 202689 flights79.5%
- Jul–Sep 202662 flights78.2%
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.
Arrival by arrival
How late YX 5644 runs when it is late
YX 5644 often beats the schedule: 102 of 309 completed flights, 33%, arrived 15 minutes or more early. The 72 late arrivals split 26 under half an hour, 20 between 30 and 60 minutes, and 26 an hour or more.
- 15+ min early102 flights33.0%
- Within 15 min135 flights43.7%
- 15–29 min late26 flights8.4%
- 30–59 min late20 flights6.5%
- 1–2 hours late17 flights5.5%
- 2+ hours late9 flights2.9%
Scale runs 0% to 100%.
Share of 309 completed flights by arrival against schedule.
12 of 73 late departures made up the time and arrived on time, 16% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for YX 5644
The latest arrival of the period was on 27 January 2026, 4 hours 5 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 January 2026 | 4 hours 5 minutes | Carrier |
| 20 May 2026 | 3 hours 21 minutes | National Airspace System |
| 6 September 2025 | 3 hours 12 minutes | National Airspace System |
| 26 November 2025 | 2 hours 48 minutes | Carrier |
| 27 May 2026 | 2 hours 30 minutes | National Airspace System |
Delay causes
Why YX 5644 runs late
Late-arriving aircraft accounts for 43% of the 4,280 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 29%Carrier
- 26%National Airspace System
- 2%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,280 reported delay minutes here, that single category outweighs weather by 28 to one. The split is drawn from 4,280 delay minutes reported on YX 5644.
Cancellations run at 6.04%, against 1.89% nationally. That is roughly one flight in fifteen 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
8.4% 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.
YX 5644 is not only a BOS to BWI flight. It also flew BWI to BOS (304 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. 331 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 | 304 | 65.5% | 96 min | 6.58% | C− |
What to do with this
Booking YX 5644
For a booking, the cancellation rate is the figure to plan around on YX 5644: 6.04% of its 331 scheduled flights did not operate. A late arrival costs about 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
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.