Route · STL → SFO · 2020–2025 BTS data
St. Louis to San Francisco
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to SFO (St. Louis to San Francisco) ranks #4197 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 74.4%
- On-time
- -4.6 pts
- vs US avg
- 67 min
- Delay when late
- 1,440
- Flights
- #4197 of 4927
- Corpus placement
Cancelled
1.2%
Best Month
Feb 2020 91%
Worst Month
Oct 2025 58%
Distance
1,735 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 60 | 17 | 0 | 0 | WN,UA,OO |
| Nov 2025 | 57 | 12 | 0 | 0 | UA,WN |
| Oct 2025 | 62 | 26 | 0 | 0 | OO,UA,WN |
| Sep 2025 | 60 | 12 | 0 | 0 | UA,WN,OO |
| Aug 2025 | 63 | 14 | 1 | 0 | WN,UA |
| Jul 2025 | 83 | 33 | 1 | 0 | UA,WN |
| Jun 2025 | 82 | 32 | 0 | 0 | UA,WN |
| May 2025 | 82 | 17 | 0 | 0 | UA,WN |
| Apr 2025 | 60 | 10 | 0 | 0 | UA,WN |
| Mar 2025 | 62 | 15 | 0 | 0 | UA,WN |
| Feb 2025 | 53 | 15 | 0 | 0 | UA,WN |
| Jan 2025 | 59 | 10 | 2 | 0 | UA,WN |
| Dec 2024 | 64 | 18 | 0 | 0 | UA,WN |
| Nov 2024 | 77 | 15 | 0 | 0 | UA,WN |
| Oct 2024 | 79 | 9 | 0 | 0 | UA,WN |
| Sep 2024 | 80 | 18 | 0 | 0 | WN,OO,UA |
| Aug 2024 | 53 | 8 | 0 | 0 | WN,UA |
| Jul 2024 | 31 | 13 | 0 | 0 | WN |
| Jun 2024 | 30 | 18 | 0 | 0 | WN |
| May 2024 | 31 | 18 | 0 | 0 | WN |
| Apr 2024 | 30 | 17 | 0 | 0 | WN |
| Mar 2020 | 58 | 6 | 10 | 0 | WN,OO,UA |
| Feb 2020 | 58 | 5 | 0 | 0 | WN,OO |
| Jan 2020 | 66 | 10 | 3 | 1 | WN,OO,UA |
STL–SFO seasonal on-time pattern
Best: January (84.0%) · weakest: June (55.4%)
Strongest calendar month
January
84.0% on-time · ~63 flights/mo
Busiest calendar month
October
~71 flights/mo avg
Weakest calendar month
June
55.4% on-time · ~56 flights/mo
Cancellation Rate
1.2%
17 of 1,440 flights
Diversion Rate
0.1%
1 of 1,440 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
STL - St. Louis
Full on-time, delay-cause, and seasonal performance for St. Louis, MO.
STL on-time profileSFO - San Francisco
Full on-time, delay-cause, and seasonal performance for San Francisco, CA.
SFO on-time profileCompare the two airports
See STL and SFO side by side on delays, cancellations, and reliability.
Compare STL vs SFOOrigin-hub reliability standing
Softer reliability from STL
Among 51 routes leaving STL, only 1 (including this one) clear below 75% on-time, while 5 stay ≥85% and 45 sit mid-band. Travelers comparing STL options should weigh this 74.4% print against those peers · fleet on-time rank #4563 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–SFO.
Routes with a similar on-time rate
What the Data Says About STL to SFO
On-time performance on the STL to SFO pairing (St. Louis to San Francisco) trails a chunk of the network: 74.4% of 1,440 tracked flights arrived on schedule, with a 67.4-minute average delay on the ones that ran late. The route spans about 1,735 miles across 8 carriers. Cancellations over the trailing 24 months hit 1.2% (17 of 1,440 flights), with 0.1% diverted.
The monthly split is wide on this route: Feb 2020 posted the strongest performance at 91% on-time, while Oct 2025 came in at just 58% - a 33-point swing worth factoring into travel timing.
On the multi-year calendar, STL–SFO peaks in January at 84.0% on-time while October carries the heaviest traffic (~71 flights per month) ; the softest month is June at 55.4%, a 28.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does STL to SFO rank among US routes by traffic? ▼
How often are flights delayed from STL to SFO? ▼
What is the cancellation rate for STL to SFO? ▼
How far is the flight from STL to SFO? ▼
When is the best time to fly from STL to SFO? ▼
Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using STL–SFO data
STL–SFO sits 4.6 pts below the national 79% average; check the seasonal chart and airport profiles before treating the headline as typical.
- Compare STL and SFO airport profiles: delay causes and top routes differ even on the same corridor. STL airport
- If your dates flex, January (84.0% on-time) beats June (55.4%) on this corridor. Seasonal chart
- 4 other routes post a similar 74.4% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.