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Enter a route to see every airline that flies it with enough flights, side by side on the same metrics, from the same source.
Airlines on SEA → SFO
Every airline with at least 200 flights on this route, over the route's reporting period.
SkyWest Airlines is clearly ahead of the rest on 2 of 4 rates; the other 2 are too close to call: United Airlines, SkyWest Airlines, and Delta Air Lines on 1, Alaska Airlines, SkyWest Airlines, and Delta Air Lines on 1.
| Metric | Alaska Airlines | United Airlines | SkyWest Airlines | Delta Air Lines |
|---|---|---|---|---|
| On-time arrival · too close to call | 64.5% | 71.5% (too close to call with the best) | 72.2% (best, but too close to call) | 71.5% (too close to call with the best) |
| Cancellation rate | 1.40% | 0.80% | 0.41% (best) | 1.02% |
| Severe delay (60+ min) · too close to call | 9.1% (too close to call with the best) | 10.2% | 8.1% (best, but too close to call) | 9.1% (too close to call with the best) |
| Average arrival delay | 15 min | 12 min | 10 min (best) | 11 min |
| Median arrival delay | 5 min | -4 min (best) | -1 min | -3 min |
| Departure on-time | 67.6% | 74.7% | 78.1% (best) | 73.5% |
| Flights analyzed | 8,634 | 6,012 | 3,377 | 2,745 |
A check mark and green mark the best figure in a row (higher for on-time rates, lower for delays and cancellations) when it is clearly better than every other side’s: a two-proportion test against each, on that side’s flight count, at about 95% confidence. When it is not, the row says “too close to call” and a “≈” marks the sides that cannot be told apart from the best figure. Average and median delay carry no sample-error estimate here, so they are marked by the printed figure alone.
SEA → SFO (Seattle to San Francisco · 679 mi): July 2023 – July 2026. FlyerIntel keeps one total per airline for the route, not the dates each airline started or stopped flying it, so an airline that flew the route for only part of that time is measured over that part.
Source: FlyerIntel analysis of US DOT BTS data · Airlines with fewer than 200 flights on this route are left out.
Month by month
There is no month-by-month chart for these airlines. FlyerIntel keeps monthly figures for each route and for each airline across its whole network, but not for one airline on one route. The SEA → SFO route page shows the route’s own trend.