Denver International to San Diego International
852 miles great-circle distance, typically flown in 2h 07m with 6 airlines operating direct service from Denver International (DEN) to San Diego International (SAN). Cheapest fares are usually in January (around $119 return), with peak prices in August (around $357). Departures on a Tuesday tend to undercut weekend prices on this corridor.
Flying from Denver International
Denver International sits 25 miles northeast of downtown Denver — a deliberately remote site that allows for six runways and almost unlimited expansion. The A Line commuter train runs every 15 minutes from the airport directly to Union Station downtown in 37 minutes for $10.50. United dominates the schedule with its largest non-Newark hub; Southwest and Frontier add heavy domestic capacity. Snow disruption is common between November and March, but the airport's ground-stop policy is faster than ORD's.
Arriving in San Diego
San Diego International is 3 miles from downtown San Diego — the second most central US airport after BOS. MTS Route 992 runs from the terminals directly to downtown San Diego in 15 minutes for $2.50. Fares from US East Coast cities peak around Comic-Con (mid-July) and the San Diego Padres' major series; September–November is consistently the cheapest window with the best weather.
Who flies DEN to SAN?
| Airline | IATA | Flight time | Cabin |
| United Airlines | UA | 2h 07m | Economy |
| Southwest Airlines | WN | 2h 07m | Economy |
| Frontier Airlines | F9 | 2h 07m | Economy |
| Spirit Airlines | NK | 2h 07m | Economy |
| American Airlines | AA | 2h 07m | Economy |
| Delta Air Lines | DL | 2h 07m | Economy |
6 carriers fly direct on this corridor. Frequencies vary by season — summer and winter holiday peaks see additional flights.
Best time to fly DEN→SAN
Synthesised from 12-month price aggregates. Cheapest months in green, peak in red.
Estimated baseline. Prices update on a 30-day cadence as Travelpayouts data refreshes. Cheapest day-of-week typically Tuesday.
Denver to San Diego FAQs
Direct flights from Denver International (DEN) to San Diego International (SAN) take approximately 2h 07m for the 852-mile journey, plus 30–60 minutes of taxi, climb and descent. Total airport-to-airport time depends on cruise winds and air-traffic queueing on approach.
January is typically the cheapest month on this route, with one-way fares from $119. August is the peak — expect prices 2–3× higher. Book 4–8 weeks ahead for best fares; last-minute prices on this corridor rise sharply inside two weeks of departure.
6 carriers operate direct service from Denver International (DEN) to San Diego International (SAN): United Airlines, Southwest Airlines, Frontier Airlines, Spirit Airlines, American Airlines and 1 more. Frequencies vary by season and carrier — United Airlines typically operates the highest weekly count on this corridor.
No — United States is domestic travel for US citizens. A US passport is not required for the 50 states, DC or US territories (Puerto Rico, US Virgin Islands, Guam, American Samoa, Northern Mariana Islands), though Real ID-compliant ID is required at TSA from May 2025.
San Diego International (SAN) is the primary international airport for San Diego. Allow 30–60 minutes for the ground transfer by train, express bus, taxi or rideshare depending on traffic and time of day. See the airport's official website for current train and shuttle timetables.