Flight number record

B6 620

JetBlue Airways · San Diego to Boston

Route: SAN → BOS
Departs: 15:15
Flights: 265
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s B6 620, check with JetBlue Airways.

B6 620 lands a B, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 265 flights, with a median arrival 10 minutes early.

On time

76.5%

Arrivals under 15 minutes late, of 260 completed flights

Avg delay

94 min

Across delayed arrivals only, not all flights

Cancelled

1.51%

National rate is 1.81%

1 hour+ late

10.8%

National rate is 8.1%

These figures cover 265 flights between July 2025 and June 2026. Beyond the headline rate, 10.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When B6 620 flies

B6 620 flies SAN to BOS without a single fixed slot. Its most common scheduled departure was 15:15, used on 57 of 265 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:1557 flights21.5%

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 15:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and B6 620 runs 4 points better at 76.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

B6 620 next to SAN to BOS

Every carrier on SAN to BOS combined arrived on time 77.9% of the time across 1,818 flights, so B6 620 is about level with it. JetBlue flew 919 flights on the same city pair under all its flight numbers, including this one, and those ran 79.3% on time. Across its whole network JetBlue Airways managed 72.7%, which this flight beats by 4 points.

B6 620 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
B6 620thin sample	265	76.5%	94 min	1.51%	B
All JetBlue Airways on SAN–BOS	919	79.3%	99 min	1.41%	B
All carriers on SAN–BOS	1,818	77.9%	85 min	1.54%	B
JetBlue Airways, whole network	234,468	72.7%	76 min	2.56%	C

Across the year

B6 620 quarter by quarter

B6 620 did not run the same all year. Its best quarter was Apr–Jun 2026 at 87.0% on time and its weakest Jul–Sep 2025 at 69.1%, a swing of 18 points on roughly 66 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 202555 flights69.1%
Oct–Dec 202555 flights74.5%
Jan–Mar 202678 flights72.6%
Apr–Jun 202677 flights87.0%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, B6 620 did best on Tuesday at 84.2% on time and worst on Friday at 69.8%. Each day rests on about 38 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why B6 620 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 5,719 reported delay minutes.

National Airspace System
41%
Carrier
35%
Late-arriving aircraft
23%
Extreme weather
1%
Security
0%

The largest share of delay minutes, 35%, 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 2,006 of the 5,719 delay minutes reported here. The split is drawn from 5,719 delay minutes reported on B6 620.

Cancellations sit at 1.51% against a national 1.81%, which is ordinary. Diversions add another 0.38%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

At 2,588 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 265 flights under B6 620 in the data flew SAN to BOS. 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. 265 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 B6 620

For a booking, read B6 620 as 76.5% on time with 1.51% cancelled over 265 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 JetBlue 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