Route reliability record
EUG→SFO
Eugene to San Francisco
- Flights
- 1,004
- Period
- September 2025 to August 2026
- Distance
- 451 mi
- Carriers
- 2
This route draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 1,004 EUG to SFO flights, with a median arrival 1 minute late.
Best time to fly EUG to SFO: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 89.5% of the time and Tuesday flights 73.5%, against 65.6% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 12 points behind the country as a whole. Across a thousand flights that is about 117 extra late arrivals.
Key figures
On time
65.6%
Arrivals under 15 minutes late, of 995 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
0.90%
National rate is 1.89%
Best carrier
United
72.9% on time across 756 flights
These figures cover 1,004 flights between September 2025 and August 2026. Beyond the headline rate, 14.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on EUG to SFO
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 756 | 72.9% | 67 min | 0.53% | C+ |
| SkyWest Airlinesthin sample | 248 | 43.2% | 88 min | 2.02% | F |
Flight by flight
Flights on EUG to SFO
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 43 points, against half a point between the best and worst carrier.
- 5am–8am383 flights89.5%
- 8am–11am—
- 11am–2pm—
- 2pm–5pm375 flights53.7%
- 5pm–8pm246 flights46.5%
- 8pm–5am—
Scale runs 40% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 46.5% on time, against 89.5% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 383 flights scheduled in it.
Explore
Filter EUG to SFO by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On EUG to SFO, the best departure window is 5am–8am at 89.5% on time and the worst is 5pm–8pm at 46.5%, a wide gap of 43.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.5%
- 8–11am—
- 11am–2pm—
- 2–5pm53.7%
- 5–8pm46.5%
- 8pm–5am—
best all US flightsScale 40% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 45 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
July is the worst month at 41.4% on time, 45 points below March, the best at 86.2%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. August was the busiest month here, with 103 flights.
Across the week, Tuesday is the strongest day at 73.5% on time and Friday the weakest at 59.6%, a spread of 14 points.
Delay causes
Why this route gets delayed
National Airspace System accounts for 60% of the 26,000 delay minutes carriers reported here, and the remaining four split what is left.
- 60%National Airspace System
- 21%Carrier
- 18%Late-arriving aircraft
- 1%Extreme weather
60% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 16,000 minutes out of 26,000, against a national NAS share of 21%. The split is drawn from 25,840 reported delay minutes.
Cancellations sit at 0.90% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here actually costs
14.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 451 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 73.9% on time across 1,004 flights, 8 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 8 points of difference.
One caution: this is a thin sample. 1,004 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
Work out the risk of missing a connection in SFO after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 1,004 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 65.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 995 completed flights over 12 months sit behind that.
Common questions
EUG to SFO questions
How often is EUG to SFO delayed?
About one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 34.4% of the 1,004 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is EUG to SFO compared with the rest of the country?
65.6% of flights arrive on time here against a national 77.3%, a difference of 12 points against it. That is worth a C+ on this site's grading scale.
What time of day has the fewest delays on EUG to SFO?
The 5am–8am departure window is the strongest at 89.5% on time. The 5pm–8pm window is the weakest at 46.5%, 43 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on EUG to SFO?
July is the weakest month at 41.4% on time, compared with 86.2% in March. Across the year that is 45 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- SFO to EUG — the return legseparate record
- San Francisco International (SFO) delay statistics
- United Airlines on EUG to SFO72.9%
- SkyWest Airlines on EUG to SFO43.2%
- EUG to SEA, a related route87.5%
- LAX to SFO, a related route60.1%
- EUG to DEN, a related route79.9%
- United Airlines on-time record72.9%
- SkyWest Airlines on-time record43.2%
- The best time of day to fly, according to 7.05 million flight records
- How often a connection fails at the major US hubs
Direction matters. EUG to SFO and SFO to EUG are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.