Flight number record

UA 1349

United Airlines · Boston to Chicago

Route: BOS → ORD
Departs: 09:50
Flights: 308
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1349, check with United Airlines.

UA 1349 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 308 flights, with a median arrival 11 minutes early.

Set against the rest of the country, UA 1349's record is 9 points better than the US average of 77.3%. That gap is worth roughly 87 fewer late arrivals for every thousand flights.

On time

86.0%

Arrivals under 15 minutes late, of 300 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

1.62%

National rate is 1.89%

1 hour+ late

4.3%

National rate is 8.3%

These figures cover 308 flights between September 2025 and August 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.

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Schedule

When UA 1349 flies

UA 1349 flies BOS to ORD without a single fixed slot. Its most common scheduled departure was 09:50, used on 78 of 308 flights, with 09:20 (63 flights) and 09:40 (62 flights) next.

Departs 09:5078 flights25.3%
Departs 09:2063 flights20.5%
Departs 09:4062 flights20.1%

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 09:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1349 runs 2 points better at 86.0%. 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

UA 1349 next to BOS to ORD

Every carrier on BOS to ORD combined arrived on time 71.9% of the time across 7,860 flights, so UA 1349 is 14 points ahead of it. United flew 2,791 flights on the same city pair under all its flight numbers, including this one, and those ran 74.5% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 7 points.

UA 1349 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1349thin sample	308	86.0%	71 min	1.62%	A
All United Airlines on BOS–ORD	2,791	74.5%	86 min	1.79%	C
All carriers on BOS–ORD	7,860	71.9%	87 min	2.98%	C
United Airlines, whole network	830,825	78.8%	73 min	1.02%	B

Across the year

UA 1349 quarter by quarter

Quarter by quarter UA 1349 held fairly steady: 84.8% in Oct–Dec 2025, 85.5% in Jan–Mar 2026, 87.8% in Apr–Jun 2026 and 85.2% in Jul–Sep 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Oct–Dec 202566 flights84.8%
Jan–Mar 202689 flights85.5%
Apr–Jun 202691 flights87.8%
Jul–Sep 202662 flights85.2%

Scale runs 75% to 95%.

By weekday, UA 1349 did best on Wednesday at 93.0% on time and worst on Sunday at 75.6%. Each day rests on about 44 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late UA 1349 runs when it is late

UA 1349 often beats the schedule: 112 of 300 completed flights, 37%, arrived 15 minutes or more early. The 42 late arrivals split 17 under half an hour, 12 between 30 and 60 minutes, and 13 an hour or more.

15+ min early112 flights37.3%
Within 15 min146 flights48.7%
15–29 min late17 flights5.7%
30–59 min late12 flights4.0%
1–2 hours late5 flights1.7%
2+ hours late8 flights2.7%

Scale runs 0% to 100%.

Share of 300 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 28 departures that left 15 minutes late or more, only 3 made it up before arrival. In the other direction, 17 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ORD.

The worst days

Worst days for UA 1349

The latest arrival of the period was on 9 January 2026, 7 hours 21 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.

The latest arrivals of UA 1349 in the period
Date	Arrived late by	Largest filed cause
9 January 2026	7 hours 21 minutes	Carrier
7 December 2025	4 hours 26 minutes	National Airspace System
29 November 2025	3 hours 54 minutes	National Airspace System
3 August 2026	2 hours 57 minutes	Carrier
21 January 2026	2 hours 41 minutes	Carrier

Delay causes

Why UA 1349 runs late

National Airspace System accounts for 60% of the 2,971 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
60%
Carrier
32%
Late-arriving aircraft
5%
Extreme weather
2%

60% 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 1,795 minutes out of 2,971, against a national NAS share of 21%. The split is drawn from 2,971 delay minutes reported on UA 1349.

Cancellations sit at 1.62% against a national 1.89%, which is ordinary. Diversions add another 0.97%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.3% 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.

The 867 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.

The same number turns up on six other city pairs in the data, including ORD to PIT (165), PIT to LAX (81) and ORD to MCO (58), but none flew often enough under UA 1349 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to ORD only.

One caution: this is a thin sample. 308 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 UA 1349

For a booking, read UA 1349 as 86.0% on time with 1.62% cancelled over 308 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

A flight number here means United Airlines’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