Route reliability record
EUG→SFO
Eugene to San Francisco
- Flights
- 997
- Period
- July 2025 to June 2026
- Distance
- 451 mi
- Carriers
- 2
This route sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 997 EUG to SFO flights, with a median arrival 4 minutes early.
Best time to fly EUG to SFO: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 92.0% of the time and Tuesday flights 80.4%, against 72.0% for the route overall.
The national on-time rate over the same period is 77.6%, so this route runs 6 points behind the country as a whole. Across a thousand flights that is about 56 extra late arrivals.
Key figures
On time
72.0%
Arrivals under 15 minutes late, of 989 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.80%
National rate is 1.81%
Best carrier
United
76.4% on time across 748 flights
These figures cover 997 flights between July 2025 and June 2026. Beyond the headline rate, 11.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
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 | 748 | 76.4% | 72 min | 0.40% | B+ |
| SkyWest Airlinesthin sample | 249 | 58.6% | 82 min | 2.01% | D |
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.
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 35 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am365 flights92.0%
- 8am–11am—
- 11am–2pm—
- 2pm–5pm361 flights62.9%
- 5pm–8pm271 flights57.1%
- 8pm–5am—
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 57.1% on time, against 92.0% 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 365 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 40 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.
June is the worst month at 46.1% on time, 40 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 93 flights.
Across the week, Tuesday is the strongest day at 80.4% on time and Sunday the weakest at 66.4%. 14 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. National Airspace System accounts for 56% of the 21,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 56%National Airspace System
- 23%Carrier
- 21%Late-arriving aircraft
- 0%Extreme weather
56% 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 12,000 minutes out of 21,000, against a national NAS share of 21%. The split is drawn from 20,872 reported delay minutes.
Cancellations are rare at 0.80%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 78.5% on time across 997 flights, 7 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 7 points of difference.
One caution: this is a thin sample. 997 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. 997 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 72.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 989 completed flights over 12 months sit behind that.
Common questions
EUG to SFO questions
How often is EUG to SFO delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 28.0% of the 997 flights in this analysis, against 22.4% 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?
72.0% of flights arrive on time here against a national 77.6%, a difference of 6 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 92.0% on time. The 5pm–8pm window is the weakest at 57.1%, 35 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 June delays on EUG to SFO?
June is the weakest month at 46.1% on time, compared with 86.2% in March. Across the year that is 40 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 SFO76.4%
- SkyWest Airlines on EUG to SFO58.6%
- EUG to SEA, a related route87.8%
- LAX to SFO, a related route64.8%
- EUG to DEN, a related route79.2%
- United Airlines on-time record76.4%
- SkyWest Airlines on-time record58.6%
- The best time of day to fly, according to 7.04 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.