Flight number record

YX 3690

Republic Airways · Chicago to Indianapolis

Route: ORD → IND
Departs: 15:40
Flights: 304
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 3690, 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 3690 lands a B, 5 points better than the national rate of 77.6%. About one flight in six 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 304 flights, with a median arrival 4 minutes early.

Set against the rest of the country, YX 3690's record is 5 points better than the US average of 77.6%. That gap is worth roughly 47 fewer late arrivals for every thousand flights.

On time

82.3%

Arrivals under 15 minutes late, of 294 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

2.96%

National rate is 1.81%

1 hour+ late

6.5%

National rate is 8.1%

These figures cover 304 flights between July 2025 and June 2026. The median arrival is 4 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 3690 flies

YX 3690 flies ORD to IND without a single fixed slot. Its most common scheduled departure was 15:40, used on 140 of 304 flights, with 15:35 (53 flights) and 15:41 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:40140 flights46.1%
Departs 15:3553 flights17.4%
Departs 15:4137 flights12.2%

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 15:40 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and YX 3690 runs 10 points better at 82.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

YX 3690 next to ORD to IND

Every carrier on ORD to IND combined arrived on time 74.2% of the time across 5,206 flights, so YX 3690 is 8 points ahead of it. Republic flew 2,716 flights on the same city pair under all its flight numbers, including this one, and those ran 76.5% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 4 points.

YX 3690 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 3690thin sample	304	82.3%	66 min	2.96%	B
All Republic Airways on ORD–IND	2,716	76.5%	79 min	3.35%	B−
All carriers on ORD–IND	5,206	74.2%	75 min	3.63%	C−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 3690 quarter by quarter

Quarter by quarter YX 3690 held fairly steady: 79.3% in Jul–Sep 2025, 80.3% in Oct–Dec 2025, 84.5% in Jan–Mar 2026 and 87.2% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights79.3%
Oct–Dec 202577 flights80.3%
Jan–Mar 202685 flights84.5%
Apr–Jun 202650 flights87.2%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, YX 3690 did best on Saturday at 90.0% on time and worst on Monday at 75.0%. Each day rests on about 43 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 3690 runs late

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 3,404 reported delay minutes.

Late-arriving aircraft
40%
National Airspace System
26%
Carrier
20%
Extreme weather
14%

Extreme weather accounts for 14% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.3 times the usual weather exposure. The split is drawn from 3,404 delay minutes reported on YX 3690.

Cancellations run at 2.96%, 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

6.5% 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.

The same number turns up on four other city pairs in the data, including ORD to EYW (41), ORF to ORD (25) and FSD to ORD (19), but none flew often enough under YX 3690 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to IND only.

One caution: this is a thin sample. 304 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.

What to do with this

Booking YX 3690

For a booking, the cancellation rate is the figure to plan around on YX 3690: 2.96% of its 304 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