DEN to LGB flight delays
Denver, CO (DEN) Long Beach, CA (LGB) · 854 miles
1,010 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
73.01%
Arrived on time
Within 15 minutes of schedule
0.5%
Cancelled
Share of scheduled flights
51 min
When late, late by
Average across delayed arrivals
15 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In January it ran 31.5 points more punctual than in June — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The two directions do not behave alike. LGB to DEN arrives on time 8.8 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Only Southwest Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
Flights from Denver to Long Beach run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over January 2025 – August 2026, Southwest Airlines arrived on time most often on DEN to LGB. Flights ran closest to schedule in January and worst in June.
Every airline on DEN to LGB
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 1,010 | 73.01% | 0.5% | 51 min | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
LGB to DEN Long Beach back to Denver 81.85% on time BOther routes from Denver
Common questions
Are flights from Denver to Long Beach usually delayed?
73.01% of flights on the DEN to LGB route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Denver to Long Beach?
Only Southwest Airlines appears in the published record on this route, with 1,010 flights and 73.01% arriving on time.
How often are DEN to LGB flights cancelled?
0.5% of scheduled flights did not operate — about 5 in every thousand. That is in the normal range.
What is the best month to fly Denver to Long Beach?
January, when 86.6% of flights arrived on time. The worst was June at 55.1%.
When DEN to LGB flights are late, how late are they?
About 51 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on DEN to LGB during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →