My trip
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Tell FlyerIntel where and when you are flying. It will show how that route actually performs at that time of day and on that day of the week, what both airports are doing right now, and when to get to the airport.
SFO → BOS
San Francisco to Boston · departing 8:25 AM
SFO → BOS flights departing 5–9 AM arrive on time 86.5% of the time, against 77.9% across the whole day — your departure window is 8.6 points better than average for this route.
Your slot
Add a date above to see how that hour has done on your day of the week, and what a nearby slot would change.
Other times on SFO → BOS
Time of day
5–9 AM is among the most reliable times to leave on SFO → BOS: 86.5% on time.
- 5–9 AM86.5%
- 9 AM–12 PM69.4%
- 12–3 PM73.3%
- 3–6 PM78.1%
- 6–9 PM81.4%
- 9 PM–5 AM76.8%
Day of week
- Monday76.1%
- Tuesday81.8%
- Wednesday80.6%
- Thursday73.2%
- Friday76.2%
- Saturday82.4%
- Sunday76.2%
Bars start below the lowest figure so a real gap is visible; read the percentage, not the bar length. A time with too few flights to score is left unscored rather than guessed at.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · History describes what has happened on this route. It is not a prediction about your flight. Full route profile →
Which flight
Flights on SFO → BOS, the ones scheduled closest to 8:25 AM first.
Within 90 minutes of 8:25 AM, DL400 (usually 7:10 AM) has the best record: 90.4% on time and 1.40% cancelled over 784 flights, against 77.9% on time for SFO → BOS as a whole.
| Flight | Usually departs | On time | Cancelled |
|---|---|---|---|
| UA2647United AirlinesLive map | 8:25 AM | 83.0% | 1.08% |
| DL400Delta Air LinesLive map | 7:10 AM75 min away | 90.4% | 1.40% |
| B6434JetBlueLive map | 6:00 AM145 min away | 86.2% | 1.11% |
| B6834JetBlueLive map | 10:56 AM151 min away | 70.6% | 0.00% |
| B61734JetBlueLive map | 12:20 PM235 min away | 74.9% | 1.04% |
| UA1372United AirlinesLive map | 1:00 PM275 min away | 77.8% | 0.93% |
| B6734JetBlueLive map | 3:15 PM410 min away | 76.9% | 1.60% |
| UA2001United AirlinesLive map | 4:15 PM470 min away | 88.3% | 0.00% |
| B61034JetBlueLive map | 11:48 PM517 min away | 53.9% | 2.20% |
| UA1665United AirlinesLive map | 11:25 PM540 min away | 81.8% | 1.24% |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Showing 10 of 12 flight numbers. “Usually departs” is the scheduled time each flight number most often had over the period; airlines retime flights, so confirm the time on your booking. Flight numbers with fewer than 90 operations on this route are left out. This is history, not a forecast for your flight.
When to get to the airport
A starting point for SFO, not a promise about your day.
2h 20m before your 8:25 AM departure
How this was worked out
- FlyerIntel cannot currently obtain live security wait times for SFO, so this figure does not account for the queue on the day.
- It does not include your journey to the airport, parking, or a shuttle from a remote lot.
- International departures, and travel with children, checked pets or special assistance, need more time.
Both airports right now
Aviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedAviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedSource: NOAA Aviation Weather Center · Conditions describe the airfield, not your flight, and change quickly.
Who flies this route
Performance by the carrier that actually operates the flight.
| Carrier | Flights | On time | Cancelled | Median delay |
|---|---|---|---|---|
| United Airlines | 5,526 | 79.4% | 1.01% | -8 min |
| JetBlue | 5,054 | 76.1% | 1.07% | -7 min |
| Delta Air Lines | 2,529 | 77.3% | 1.03% | -5 min |
| Alaska Airlines | 1,117 | 79.1% | 1.07% | -6 min |