Flight number record

YX 3677

Republic Airways · Indianapolis to Chicago

Route: IND → ORD
Departs: 11:25
Flights: 273
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 3677, 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 3677 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 273 flights, with a median arrival 12 minutes early.

Set against the rest of the country, YX 3677's record is 10 points better than the US average of 77.6%. That gap is worth roughly 98 fewer late arrivals for every thousand flights.

On time

87.4%

Arrivals under 15 minutes late, of 269 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

1.47%

National rate is 1.81%

1 hour+ late

4.8%

National rate is 8.1%

These figures cover 273 flights between July 2025 and June 2026. The median arrival is 12 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 3677 flies

YX 3677 flies IND to ORD without a single fixed slot. Its most common scheduled departure was 11:25, used on 94 of 273 flights, with 11:20 (55 flights) and 11:45 (42 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:2594 flights34.4%
Departs 11:2055 flights20.1%
Departs 11:4542 flights15.4%

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 11:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and YX 3677 runs 9 points better at 87.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

YX 3677 next to IND to ORD

Every carrier on IND to ORD combined arrived on time 76.5% of the time across 5,201 flights, so YX 3677 is 11 points ahead of it. Republic flew 2,713 flights on the same city pair under all its flight numbers, including this one, and those ran 82.4% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 9 points.

YX 3677 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 3677thin sample	273	87.4%	62 min	1.47%	A
All Republic Airways on IND–ORD	2,713	82.4%	70 min	2.06%	B
All carriers on IND–ORD	5,201	76.5%	83 min	3.06%	B−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 3677 quarter by quarter

Quarter by quarter YX 3677 held fairly steady: 88.2% in Jul–Sep 2025, 83.0% in Oct–Dec 2025, 92.3% in Jan–Mar 2026 and 87.1% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202585 flights88.2%
Oct–Dec 202591 flights83.0%
Jan–Mar 202666 flights92.3%
Apr–Jun 202631 flights87.1%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, YX 3677 did best on Wednesday at 94.3% on time and worst on Sunday at 81.6%. Each day rests on about 39 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 3677 runs late

One category carries most of the weight here. National Airspace System accounts for 63% of the 2,122 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.

National Airspace System
63%
Late-arriving aircraft
20%
Carrier
17%

63% 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 1,334 minutes out of 2,122, against a national NAS share of 21%. The split is drawn from 2,122 delay minutes reported on YX 3677.

Cancellations sit at 1.47% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.8% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The same number turns up on six other city pairs in the data, including ORD to CVG (33), CMH to ORD (24) and ORD to DSM (5), but none flew often enough under YX 3677 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IND to ORD only.

One caution: this is a thin sample. 273 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 3677

For a booking, YX 3677 has one of the better records a US domestic flight can show: 87.4% on time and 1.47% cancelled. That is a base rate, not a promise about any single day.

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