Flight number record

AS 420

Alaska Airlines · Seattle to Orlando

Route: SEA → MCO
Departs: 08:01
Flights: 362
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 420, check with Alaska Airlines.

AS 420 lands a B+, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That is a workable record, not a spotless one. That rests on 362 flights, with a median arrival 8 minutes early.

On time

80.7%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

43 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

4.2%

National rate is 8.1%

These figures cover 362 flights between July 2025 and June 2026. The median arrival is 8 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 420 flies

AS 420 flies SEA to MCO without a single fixed slot. Its most common scheduled departure was 08:01, used on 67 of 362 flights, with 15:53 (48 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:0167 flights18.5%
Departs 15:5348 flights13.3%

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 08:01 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and AS 420 runs 3 points worse at 80.7%. 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 420 next to SEA to MCO

Every carrier on SEA to MCO combined arrived on time 81.0% of the time across 1,820 flights, so AS 420 is about level with it. Alaska flew 1,101 flights on the same city pair under all its flight numbers, including this one, and those ran 81.9% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight beats by 2 points.

AS 420 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 420thin sample	362	80.7%	43 min	0.55%	B+
All Alaska Airlines on SEA–MCO	1,101	81.9%	43 min	0.36%	B+
All carriers on SEA–MCO	1,820	81.0%	50 min	0.82%	B+
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	B

Across the year

AS 420 quarter by quarter

AS 420 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.2% on time and its weakest Jul–Sep 2025 at 71.9%, a swing of 13 points on roughly 91 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 202590 flights71.9%
Oct–Dec 202592 flights84.8%
Jan–Mar 202690 flights80.9%
Apr–Jun 202690 flights85.2%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, AS 420 ranged from 78.4% on Saturday to 84.6% on Thursday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why AS 420 runs late

One category carries most of the weight here. National Airspace System accounts for 46% of the 2,985 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
46%
Carrier
32%
Late-arriving aircraft
21%
Extreme weather
2%

46% 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 1,372 minutes out of 2,985, against a national NAS share of 21%. The split is drawn from 2,985 delay minutes reported on AS 420.

Cancellations are rare at 0.55%, below the national 1.81% 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 4.2% 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.

At 2,554 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 362 flights under AS 420 in the data flew SEA to MCO. 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. 362 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 420

For a booking, read AS 420 as 80.7% on time with 0.55% cancelled over 362 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