Flight number record

AS 121

Alaska Airlines · Portland to Burbank

Route: PDX → BUR
Departs: 10:53
Flights: 284
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 121, check with Alaska Airlines.

AS 121 lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 40 minutes on average. That is a workable record, not a spotless one. That rests on 284 flights, with a median arrival 3 minutes early.

On time

81.5%

Arrivals under 15 minutes late, of 281 completed flights

Avg delay

42 min

Across delayed arrivals only, not all flights

Cancelled

1.06%

National rate is 1.81%

1 hour+ late

2.8%

National rate is 8.1%

These figures cover 284 flights between July 2025 and June 2026. The median arrival is 3 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 AS 121 flies

AS 121 flies PDX to BUR without a single fixed slot. Its most common scheduled departure was 10:53, used on 50 of 284 flights, with 10:55 (39 flights) and 10:35 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:5350 flights17.6%
Departs 10:5539 flights13.7%
Departs 10:3536 flights12.7%

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 10:53 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AS 121 runs 3 points worse at 81.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

AS 121 next to PDX to BUR

Every carrier on PDX to BUR combined arrived on time 86.4% of the time across 995 flights, so AS 121 is 5 points behind it. Alaska flew 976 flights on the same city pair under all its flight numbers, including this one, and those ran 86.9% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 2 points.

AS 121 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 121thin sample	284	81.5%	42 min	1.06%	B
All Alaska Airlines on PDX–BUR	976	86.9%	52 min	1.02%	A
All carriers on PDX–BUR	995	86.4%	52 min	1.01%	A
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 121 quarter by quarter

AS 121 did not run the same all year. Its best quarter was Jan–Mar 2026 at 87.8% on time and its weakest Jul–Sep 2025 at 69.4%, a swing of 18 points on roughly 95 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 202586 flights69.4%
Oct–Dec 202587 flights83.9%
Jan–Mar 202690 flights87.8%
Apr–Jun 202621 flights—

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

By weekday, AS 121 did best on Saturday at 90.3% on time and worst on Thursday at 73.2%. Each day rests on about 41 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 121 runs late

One category carries most of the weight here. Carrier accounts for 57% of the 2,166 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
57%
National Airspace System
31%
Late-arriving aircraft
11%

The largest share of delay minutes, 57%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,245 of the 2,166 delay minutes reported here. The split is drawn from 2,166 delay minutes reported on AS 121.

Cancellations sit at 1.06% 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 2.8% 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 817 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The same number turns up on one other city pair in the data, including SEA to HNL (39), but none flew often enough under AS 121 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to PDX to BUR only.

One caution: this is a thin sample. 284 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 AS 121

For a booking, read AS 121 as 81.5% on time with 1.06% cancelled over 284 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 Alaska 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures