San Francisco to Miami Flight Delays
Sample size: 4,485 SFO–MIA flights, January 2023 to December 2025 (BTS). 18.82% of San Francisco to Miami flights arrived at least 15 minutes late. That is 5.4 points better than the 24.2% median for those routes, making this one of the steadier pairings in the network. Departure time moves the odds more than anything else on this route: 07:00 departures run 12.7% late against 34.31% for 21:00. Tuesday is the calmest day at 15.61%, Sunday the worst at 23.88%. Cancellations (2024 to 2025) peak in January at 4.67% of scheduled flights and bottom out in February at 0%. Last updated: 2026-10-01.
These figures are historical US domestic rates, not a forecast for one departure. Use the free delay prediction for your trip before you book.
SFO airport delay guide · MIA airport delay guide · Predict a SFO to MIA flight
Best time to fly SFO to MIA
The best time to fly SFO to MIA is the 7 AM departure and fly on a Tuesday, not a Sunday (15.61% against 23.88%): 12.7% of 7 AM flights arrived 15+ minutes late, against 34.31% at 9 PM.
Lowest observed delay rates depart 07:00, 22:00–23:00. The highest sit at 08:00, 12:00, 21:00. Only departure hours with at least 100 recorded flights are listed, so sparse hours are blank rather than estimated.
| Departure hour | Delayed 15+ min | Flights observed |
|---|---|---|
| 07:00 | 12.7% | 630 |
| 08:00 | 20.59% | 1,161 |
| 12:00 | 26.93% | 375 |
| 13:00 | 20.04% | 489 |
| 21:00 | 34.31% | 102 |
| 22:00 | 15.34% | 567 |
| 23:00 | 17.61% | 1,028 |
SFO to MIA flight time and distance
Scheduled gate-to-gate time from SFO to MIA is a median 5 h 33 min. Flights actually took a median 5 h 22 min gate to gate, including 4 h 53 min in the air. 2.7% ran 30 or more minutes over schedule and 74.7% arrived sooner than scheduled (BTS data, January 2023 to December 2025).
SFO to MIA is 2,585 miles (BTS data).
| Airline | Scheduled (median) | Actual (median) | In the air (median) | 30+ min over schedule | Flights |
|---|---|---|---|---|---|
| American Airlines | 5 h 30 min | 5 h 20 min | 4 h 53 min | 1.9% | 3,005 |
| United Airlines | 5 h 36 min | 5 h 27 min | 4 h 53 min | 4.5% | 1,480 |
How late, and why
When a SFO to MIA flight was late (15+ minutes), it arrived an average of 81 minutes late (median 37). 5.9% of all completed flights arrived an hour or more late (BTS data, 2023 to 2025).
Of the delay minutes on late SFO to MIA flights, 42.7% were caused by the airline (crew, maintenance, ground handling), 35.3% by a late incoming aircraft, 21.4% by the air-traffic system (volume, non-extreme weather, airport operations), 0.5% by extreme weather and 0.0% by security (BTS data, 2023 to 2025).
| Cause | Share of delay minutes |
|---|---|
| airline | 42.7% |
| late incoming aircraft | 35.3% |
| air-traffic system | 21.4% |
| extreme weather | 0.5% |
| security | 0.0% |
BTS assigns causes to delay minutes on flights that arrived 15+ minutes late. "Air-traffic system" includes non-extreme weather that slows traffic.
SFO to MIA delays by day of week
| Day | Delayed 15+ min | Flights observed |
|---|---|---|
| Mon | 19.05% | 651 |
| Tue | 15.61% | 628 |
| Wed | 18.31% | 628 |
| Thu | 19.62% | 637 |
| Fri | 18.7% | 647 |
| Sat | 16.43% | 645 |
| Sun | 23.88% | 649 |
Month-by-month cancellation pattern
Share of scheduled SFO–MIA flights cancelled in each month, from BTS 2024–2025 on-time reporting. These are cancellations, not delays. Delay figures on this page cover January 2023 to December 2025.
| Month | Cancelled | Flights scheduled |
|---|---|---|
| Jan | 4.67% | 300 |
| Feb | 0% | 262 |
| Mar | 0% | 276 |
| Apr | 0% | 269 |
| May | 0% | 274 |
| Jun | 1.22% | 246 |
| Jul | 1.45% | 275 |
| Aug | 0.38% | 265 |
| Sep | 0% | 211 |
| Oct | 0.4% | 253 |
| Nov | 0% | 292 |
| Dec | 0.35% | 284 |
Airlines on SFO to MIA: delays and cancellations
American Airlines and United Airlines fly this route today. Only carriers with at least 200 scheduled flights on the pairing are listed. Delay rates cover January 2023 to December 2025; cancellation rates cover 2024 to 2025.
| Airline | Share of flights | Delayed 15+ min | Cancelled | Flights scheduled |
|---|---|---|---|---|
| American Airlines | 64% | 19.07% | 0.34% | 2,040 |
| United Airlines | 36% | 18.31% | 1.46% | 1,167 |
Related pages
- SFO delays: rate, worst hours and live risk
- MIA delays: rate, worst hours and live risk
- US airline cancellation rates
- Thanksgiving and Christmas 2026 flight delay guide
- Predict a SFO to MIA flight
Check your odds: Will my flight be delayed? · Will my flight be cancelled?
SFO vs MIA: airport conditions
Both ends of a route shape its delay profile. These are DelayGuard's operational scores for San Francisco and Miami.
| Measure | SFO (San Francisco) | MIA (Miami) |
|---|---|---|
| Congestion | high | high |
| Weather risk | moderate | moderate |
| NAS vulnerability | high | high |
| Average taxi-out | 15 min | 17 min |
| Runways | 4 | 4 |
SFO to MIA questions
- How long is the flight from San Francisco to Miami?
- Scheduled gate-to-gate time from SFO to MIA is a median 5 h 33 min, and flights actually took a median 5 h 22 min including 4 h 53 min in the air. 2.7% ran 30+ minutes over schedule (BTS data, January 2023 to December 2025).
- How often do SFO to MIA flights get delayed?
- Across 4,485 recorded SFO–MIA departures, January 2023 to December 2025 (BTS), 18.82% arrived at least 15 minutes late. Departure time matters most: 7:00 departures run 12.7% late against 34.31% for 21:00. Actual delay frequency varies by airline, time of day, and season.
- What is the best time of year to fly SFO to MIA?
- San Francisco (CA) sees its highest delays during November–February (coastal fog) with generally low risk year-round. Miami (FL) peaks during June–September (convective/thunderstorm season). The dominant seasonal risk on this route sits at the destination (Miami) — use the DelayGuard predictor to check conditions for your specific travel date.
- Which airline is most reliable on SFO to MIA?
- On SFO→MIA, United Airlines has the lowest measured delay rate at 18.31% of 1,480 flights, and American Airlines the highest at 19.07% (BTS, January 2023 to December 2025). American Airlines cancels the fewest at 0.34% (2024 to 2025). These are route-specific figures, not airline-wide averages.
- How late are SFO to MIA flights when they are delayed?
- When a SFO to MIA flight was late (15+ minutes), it arrived an average of 81 minutes late (median 37). 5.9% of all completed flights arrived an hour or more late (BTS data, 2023 to 2025).
- How accurate is DelayGuard's delay prediction for this route?
- DelayGuard's delay risk score comes from an ML model trained on BTS data (3.95 million US domestic flights, 2023 to mid-2025), with live weather data (within 5 days of departure) and FAA NAS advisories (within 6 hours) — a likelihood of delay, not a guarantee.
Delay figures reflect arrivals 15 or more minutes late in BTS on-time reporting. Cancellation figures are separate and count flights that never operated. Hours, days and months with fewer than 100 recorded flights are omitted rather than estimated.