San Francisco to Boston — airline reliability comparison
Alaska Airlines is the most reliable airline on the SFO to BOS route with a 82% on-time rate, compared to Delta Air Lines at 77%. Based on 1,376 flights tracked.
This route involves weather-prone airports and high-congestion airports, which can affect reliability regardless of airline.
Source: Bureau of Transportation Statistics. Updated October 2026.| Airline | On-Time % | Cancel % | Avg Delay | Flights |
|---|---|---|---|---|
| Alaska AirlinesASBest | 82% | 1.2% | 52m | 1,376 |
| United AirlinesUA | 80% | 1.2% | 67m | 6,411 |
| JetBlue AirwaysB6 | 78% | 1.0% | 78m | 5,843 |
| Delta Air LinesDLWorst | 77% | 1.3% | 73m | 2,779 |
Delays, TSA, weather, gates — we'll let you know if something matters.
Data last updated October 2026. Source: Bureau of Transportation Statistics.