Flight number record

YX 3679

Republic Airways · Pittsburgh to Washington

Route: PIT → IAD
Departs: 06:10
Flights: 360
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s YX 3679, 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 3679 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 20 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 360 flights, with a median arrival 15 minutes early.

Set against the rest of the country, YX 3679's record is 20 points better than the US average of 77.3%. That gap is worth roughly 196 fewer late arrivals for every thousand flights.

On time

96.9%

Arrivals under 15 minutes late, of 357 completed flights

Avg delay

53 min

Across delayed arrivals only, not all flights

Cancelled

0.83%

National rate is 1.89%

1 hour+ late

0.8%

National rate is 8.3%

These figures cover 360 flights between September 2025 and August 2026. The median arrival is 15 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.

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Schedule

When YX 3679 flies

YX 3679 flies PIT to IAD without a single fixed slot. Its most common scheduled departure was 06:10, used on 153 of 360 flights, with 06:15 (107 flights) and 06:06 (81 flights) next.

Departs 06:10153 flights42.5%
Departs 06:15107 flights29.7%
Departs 06:0681 flights22.5%

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 06:10 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 3679 runs 8 points better at 96.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

YX 3679 next to PIT to IAD

Every carrier on PIT to IAD combined arrived on time 87.9% of the time across 1,210 flights, so YX 3679 is 9 points ahead of it. Republic flew 693 flights on the same city pair under all its flight numbers, including this one, and those ran 89.4% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 19 points.

YX 3679 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 3679thin sample	360	96.9%	53 min	0.83%	A+
All Republic Airways on PIT–IAD	693	89.4%	55 min	1.88%	A
All carriers on PIT–IAD	1,210	87.9%	66 min	1.40%	A
Republic Airways, whole network	364,452	78.1%	74 min	4.55%	B−

Across the year

YX 3679 quarter by quarter

Quarter by quarter YX 3679 held fairly steady: 100.0% in Jul–Sep 2025, 94.5% in Oct–Dec 2025, 98.8% in Jan–Mar 2026, 97.8% in Apr–Jun 2026 and 95.1% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202530 flights100.0%
Oct–Dec 202591 flights94.5%
Jan–Mar 202687 flights98.8%
Apr–Jun 202690 flights97.8%
Jul–Sep 202662 flights95.1%

Scale runs 85% to 100%.

By weekday, YX 3679 ranged from 94.1% on Tuesday to 98.1% on Thursday. With about 51 flights behind each day, a spread of 4 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late YX 3679 runs when it is late

YX 3679 often beats the schedule: 187 of 357 completed flights, 52%, arrived 15 minutes or more early. The 11 late arrivals split 5 under half an hour, 3 between 30 and 60 minutes, and 3 an hour or more.

15+ min early187 flights52.4%
Within 15 min159 flights44.5%
15–29 min late5 flights1.4%
30–59 min late3 flights0.8%
1–2 hours late2 flights0.6%
2+ hours late1 flights0.3%

Scale runs 0% to 100%.

Share of 357 completed flights by arrival against schedule.

Only 10 of 357 completed flights left 15 minutes late or more, too few to say how often the time is made up.

The worst days

Worst days for YX 3679

The latest arrival of the period was on 31 December 2025, 3 hours 2 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in December 2025.

The latest arrivals of YX 3679 in the period
Date	Arrived late by	Largest filed cause
31 December 2025	3 hours 2 minutes	Carrier
2 December 2025	1 hour 19 minutes	National Airspace System
18 July 2026	1 hour 11 minutes	Carrier
26 May 2026	56 minutes	Carrier
14 December 2025	44 minutes	National Airspace System

Delay causes

Why YX 3679 runs late

Carrier accounts for 70% of the 579 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
70%
National Airspace System
30%

The largest share of delay minutes, 70%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 406 of the 579 delay minutes reported here. The split is drawn from 579 delay minutes reported on YX 3679.

Cancellations are rare at 0.83%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 0.8% land an hour or more behind schedule, against 8.3% 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.

Every one of the 360 flights under YX 3679 in the data flew PIT to IAD. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 360 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 3679

For a booking, YX 3679 has one of the better records a US domestic flight can show: 96.9% on time and 0.83% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures