My trip
Plan a trip
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 3:15 PM
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
On SFO → BOS, flights leaving 5–9 AM arrived on time 86.5% of the time, against 78.1% for those leaving 3–6 PM: 8.4 points more often.
- 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 3:15 PM first.
Within 90 minutes of 3:15 PM, UA2001 (usually 4:15 PM) has the best record: 88.3% on time and 0.00% cancelled over 94 flights, against 77.9% on time for SFO → BOS as a whole.
| Flight | Usually departs | On time | Cancelled |
|---|---|---|---|
| B6734JetBlueLive map | 3:15 PM | 76.9% | 1.60% |
| UA2001United AirlinesLive map | 4:15 PM60 min away | 88.3% | 0.00% |
| UA1372United AirlinesLive map | 1:00 PM135 min away | 77.8% | 0.93% |
| B61734JetBlueLive map | 12:20 PM175 min away | 74.9% | 1.04% |
| B6834JetBlueLive map | 10:56 AM259 min away | 70.6% | 0.00% |
| UA796United AirlinesLive map | 9:25 PM370 min away | 86.1% | 0.42% |
| B6134JetBlueLive map | 10:00 PM405 min away | 67.0% | 0.70% |
| UA2647United AirlinesLive map | 8:25 AM410 min away | 83.0% | 1.08% |
| DL400Delta Air LinesLive map | 7:10 AM485 min away | 90.4% | 1.40% |
| UA1665United AirlinesLive map | 11:25 PM490 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.
1h 45m before your 3:15 PM 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 |