Flight number record

YX 5665

Republic Airways · Boston to Richmond

Route: BOS → RIC
Departs: 15:35
Flights: 330
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 5665, 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 5665 lands a B−, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 330 flights, with a median arrival 11 minutes early.

On time

78.2%

Arrivals under 15 minutes late, of 317 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

3.03%

National rate is 1.81%

1 hour+ late

7.6%

National rate is 8.1%

These figures cover 330 flights between July 2025 and June 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.

Schedule

When YX 5665 flies

YX 5665 flies BOS to RIC without a single fixed slot. Its most common scheduled departure was 15:35, used on 64 of 330 flights, with 16:07 (48 flights) and 15:40 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:3564 flights19.4%
Departs 16:0748 flights14.5%
Departs 15:4038 flights11.5%

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 15:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and YX 5665 runs 6 points better at 78.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

YX 5665 next to BOS to RIC

Every carrier on BOS to RIC combined arrived on time 76.4% of the time across 1,694 flights, so YX 5665 is 2 points ahead of it. Republic flew 937 flights on the same city pair under all its flight numbers, including this one, and those ran 80.1% on time. Across its whole network Republic Airways managed 78.5%, close to this flight's figure.

YX 5665 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 5665thin sample	330	78.2%	59 min	3.03%	B−
All Republic Airways on BOS–RIC	937	80.1%	62 min	2.77%	B
All carriers on BOS–RIC	1,694	76.4%	64 min	2.72%	B
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 5665 quarter by quarter

YX 5665 did not run the same all year. Its best quarter was Apr–Jun 2026 at 87.4% on time and its weakest Oct–Dec 2025 at 68.4%, a swing of 19 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 202592 flights79.5%
Oct–Dec 202578 flights68.4%
Jan–Mar 202673 flights75.8%
Apr–Jun 202687 flights87.4%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, YX 5665 did best on Saturday at 90.0% on time and worst on Friday at 71.7%. Each day rests on about 47 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 5665 runs late

One category carries most of the weight here. Carrier accounts for 49% of the 4,035 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.

Carrier
49%
Late-arriving aircraft
36%
National Airspace System
15%
Extreme weather
0%

36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,035 reported delay minutes here, that single category outweighs weather by 36 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,035 delay minutes reported on YX 5665.

Cancellations run at 3.03%, against 1.81% nationally. That is roughly 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 routes

What a delay on this flight costs

7.6% 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 about an hour, which a normal layover absorbs.

YX 5665 is not only a BOS to RIC flight. It also flew RIC to BOS (287 flights, 62.6% 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.

Other routes flown as YX 5665
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
RIC to BOSthin sample	287	62.6%	74 min	5.92%	D−

What to do with this

Booking YX 5665

For a booking, the cancellation rate is the figure to plan around on YX 5665: 3.03% of its 330 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.

Where to go next

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.

Key figures