Flight number record
B6 620
JetBlue Airways · San Diego to Boston
- Route
- SAN → BOS
- Departs
- 10:20
- Flights
- 265
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s B6 620, check with JetBlue Airways.
B6 620 sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 265 flights, with a median arrival 9 minutes early.
Key figures
On time
75.5%
Arrivals under 15 minutes late, of 257 completed flights
Avg delay
98 min
Across delayed arrivals only, not all flights
Cancelled
2.26%
National rate is 1.89%
1 hour+ late
13.2%
National rate is 8.3%
These figures cover 265 flights between September 2025 and August 2026. Beyond the headline rate, 13.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When B6 620 flies
B6 620 flies SAN to BOS without a single fixed slot. Its most common scheduled departure was 10:20, used on 67 of 265 flights, with 15:15 (57 flights) next.
- Departs 10:2067 flights25.3%
- Departs 15:1557 flights21.5%
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 10:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and B6 620 runs 8 points worse at 75.5%. 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
B6 620 next to SAN to BOS
Every carrier on SAN to BOS combined arrived on time 75.5% of the time across 1,881 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 76.6% on time. Across its whole network JetBlue Airways managed 71.3%, which this flight beats by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| B6 620thin sample | 265 | 75.5% | 98 min | 2.26% | B |
| All JetBlue Airways on SAN–BOS | 919 | 76.6% | 92 min | 2.07% | B |
| All carriers on SAN–BOS | 1,881 | 75.5% | 84 min | 1.70% | B |
| JetBlue Airways, whole network | 240,615 | 71.3% | 77 min | 3.56% | 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 2026 at 64.0%, a swing of 23 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 20252 flights—
- Oct–Dec 202555 flights74.5%
- Jan–Mar 202678 flights72.6%
- Apr–Jun 202677 flights87.0%
- Jul–Sep 202653 flights64.0%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, B6 620 ranged from 69.0% on Monday to 77.8% on Tuesday. With about 38 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late B6 620 runs when it is late
B6 620 often beats the schedule: 102 of 257 completed flights, 40%, arrived 15 minutes or more early. When B6 620 is late it tends to be very late: 34 of its 63 late arrivals were an hour or more behind, and 10 were two hours or more.
- 15+ min early102 flights39.7%
- Within 15 min92 flights35.8%
- 15–29 min late13 flights5.1%
- 30–59 min late16 flights6.2%
- 1–2 hours late24 flights9.3%
- 2+ hours late10 flights3.9%
Scale runs 0% to 100%.
Share of 257 completed flights by arrival against schedule.
A late pushback is often recovered here: of 74 departures that left 15 minutes late or more, 24 still arrived on time. In the other direction, 13 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 BOS.
The worst days
Worst days for B6 620
The latest arrival of the period was on 18 January 2026, 21 hours 30 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across January, April, March and October, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 January 2026 | 21 hours 30 minutes | Carrier |
| 17 April 2026 | 5 hours 25 minutes | Late-arriving aircraft |
| 12 March 2026 | 4 hours 44 minutes | Late-arriving aircraft |
| 15 March 2026 | 3 hours 57 minutes | Carrier |
| 14 October 2025 | 3 hours 9 minutes | National Airspace System |
Delay causes
Why B6 620 runs late
National Airspace System accounts for 42% of the 6,162 delay minutes carriers reported here, and the remaining four split what is left.
- 42%National Airspace System
- 32%Carrier
- 25%Late-arriving aircraft
- 1%Extreme weather
- 0%Security
42% 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 2,603 minutes out of 6,162, against a national NAS share of 21%. The split is drawn from 6,162 delay minutes reported on B6 620.
Cancellations sit at 2.26% against a national 1.89%, which is ordinary. Diversions add another 0.75%.
Connections and routes
What a delay on this flight costs
13.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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, B6 620 is a flight to put a long connection behind. 13.2% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- SAN to BOS, every carrier and departure
- BOS to SAN, the return direction
- JetBlue Airways 2120 on the same route81.7%
- Alaska Airlines 390 on the same route76.5%
- San Diego International (SAN) delay statistics
- Boston Logan International (BOS) delay statistics
- JetBlue Airways on-time record
- Every JetBlue Airways flight number with a record
- The most and least reliable flight numbers in the US
- How often a connection fails at the major US hubs
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.