Newark to San Francisco Flight Delays
Sample size: 12,366 EWR–SFO flights, January 2023 to December 2025 (BTS). 26.64% of Newark to San Francisco flights arrived at least 15 minutes late. That is 2.4 points worse than the 24.2% median for those routes, so schedule padding matters here. Departure time moves the odds more than anything else on this route: 06:00 departures run 18.06% late against 41.16% for 18:00. Tuesday is the calmest day at 23.03%, Thursday the worst at 29.55%. Cancellations (2024 to 2025) peak in July at 4.61% of scheduled flights and bottom out in February at 0.54%. Last updated: 2026-10-01.
These figures are historical US domestic rates, not a forecast for one departure. Use the delay risk check for your flight before you book.
EWR airport delay guide · SFO airport delay guide · Predict a EWR to SFO flight
Best time to fly EWR to SFO
The best time to fly EWR to SFO is the 6 AM departure and fly on a Tuesday, not a Thursday (23.03% against 29.55%): 18.06% of 6 AM flights arrived 15+ minutes late, against 41.16% at 6 PM.
Lowest observed delay rates depart 06:00, 09:00, 13:00. The highest sit at 18:00, 20:00–21:00. 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 |
|---|---|---|
| 06:00 | 18.06% | 1,041 |
| 07:00 | 23.1% | 606 |
| 08:00 | 23.96% | 1,081 |
| 09:00 | 18.51% | 848 |
| 10:00 | 23.66% | 879 |
| 11:00 | 24.12% | 539 |
| 12:00 | 21.67% | 503 |
| 13:00 | 21.59% | 630 |
| 14:00 | 21.93% | 839 |
| 15:00 | 24.54% | 986 |
| 16:00 | 27.6% | 1,018 |
| 17:00 | 32.57% | 789 |
| 18:00 | 41.16% | 1,108 |
| 19:00 | 34.25% | 473 |
| 20:00 | 38.29% | 828 |
| 21:00 | 40.36% | 166 |
EWR to SFO flight time and distance
Scheduled gate-to-gate time from EWR to SFO is a median 6 h 21 min. Flights actually took a median 6 h 7 min gate to gate, including 5 h 32 min in the air. 4.7% ran 30 or more minutes over schedule and 73.9% arrived sooner than scheduled (BTS data, January 2023 to December 2025).
EWR to SFO is 2,565 miles (BTS data).
| Airline | Scheduled (median) | Actual (median) | In the air (median) | 30+ min over schedule | Flights |
|---|---|---|---|---|---|
| United Airlines | 6 h 20 min | 6 h 5 min | 5 h 30 min | 4.6% | 10,050 |
| Alaska Airlines | 6 h 25 min | 6 h 15 min | 5 h 39 min | 5.2% | 2,316 |
How late, and why
When a EWR to SFO flight was late (15+ minutes), it arrived an average of 84 minutes late (median 48). 11.2% of all completed flights arrived an hour or more late (BTS data, 2023 to 2025).
Of the delay minutes on late EWR to SFO flights, 37.1% were caused by the airline (crew, maintenance, ground handling), 35.9% by a late incoming aircraft, 23.1% by the air-traffic system (volume, non-extreme weather, airport operations), 3.8% by extreme weather and 0.1% by security (BTS data, 2023 to 2025).
| Cause | Share of delay minutes |
|---|---|
| airline | 37.1% |
| late incoming aircraft | 35.9% |
| air-traffic system | 23.1% |
| extreme weather | 3.8% |
| security | 0.1% |
BTS assigns causes to delay minutes on flights that arrived 15+ minutes late. "Air-traffic system" includes non-extreme weather that slows traffic.
EWR to SFO delays by day of week
| Day | Delayed 15+ min | Flights observed |
|---|---|---|
| Mon | 25.75% | 1,798 |
| Tue | 23.03% | 1,785 |
| Wed | 26.35% | 1,791 |
| Thu | 29.55% | 1,780 |
| Fri | 27.92% | 1,780 |
| Sat | 25.36% | 1,660 |
| Sun | 28.44% | 1,772 |
Month-by-month cancellation pattern
Share of scheduled EWR–SFO 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 | 2.16% | 601 |
| Feb | 0.54% | 559 |
| Mar | 0.59% | 676 |
| Apr | 1.1% | 725 |
| May | 3.44% | 755 |
| Jun | 2.82% | 709 |
| Jul | 4.61% | 738 |
| Aug | 4.13% | 726 |
| Sep | 1.16% | 687 |
| Oct | 0.79% | 756 |
| Nov | 1.2% | 747 |
| Dec | 0.81% | 741 |
Airlines on EWR to SFO: delays and cancellations
United Airlines and Alaska 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 |
|---|---|---|---|---|
| United Airlines | 84% | 26.8% | 2% | 7,036 |
| Alaska Airlines | 16% | 25.95% | 1.88% | 1,384 |
Related pages
- EWR delays: rate, worst hours and live risk
- SFO delays: rate, worst hours and live risk
- US airline cancellation rates
- Thanksgiving and Christmas 2026 flight delay guide
- Predict a EWR to SFO flight
Check your odds: Will my flight be delayed? · Will my flight be cancelled?
EWR vs SFO: airport conditions
Both ends of a route shape its delay profile. These are DelayGuard's operational scores for Newark and San Francisco.
| Measure | EWR (Newark) | SFO (San Francisco) |
|---|---|---|
| Congestion | high | high |
| Weather risk | high | moderate |
| NAS vulnerability | high | high |
| Average taxi-out | 25 min | 15 min |
| Runways | 3 | 4 |
EWR to SFO questions
- How long is the flight from Newark to San Francisco?
- Scheduled gate-to-gate time from EWR to SFO is a median 6 h 21 min, and flights actually took a median 6 h 7 min including 5 h 32 min in the air. 4.7% ran 30+ minutes over schedule (BTS data, January 2023 to December 2025).
- How often do EWR to SFO flights get delayed?
- Across 12,366 recorded EWR–SFO departures, January 2023 to December 2025 (BTS), 26.64% arrived at least 15 minutes late. Departure time matters most: 6:00 departures run 18.06% late against 41.16% for 18:00. Actual delay frequency varies by airline, time of day, and season.
- What is the best time of year to fly EWR to SFO?
- Newark (NJ) sees its highest delays during December–February (winter weather) and June–August (summer storms). San Francisco (CA) peaks during November–February (coastal fog) with generally low risk year-round. The dominant seasonal risk on this route sits at the origin (Newark) — use the DelayGuard predictor to check conditions for your specific travel date.
- Which airline is most reliable on EWR to SFO?
- On EWR→SFO, Alaska Airlines has the lowest measured delay rate at 25.95% of 2,316 flights, and United Airlines the highest at 26.8% (BTS, January 2023 to December 2025). Alaska Airlines cancels the fewest at 1.88% (2024 to 2025). These are route-specific figures, not airline-wide averages.
- How late are EWR to SFO flights when they are delayed?
- When a EWR to SFO flight was late (15+ minutes), it arrived an average of 84 minutes late (median 48). 11.2% 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.