Chicago O'Hare to San Diego International
1720 miles great-circle distance, typically flown in 3h 52m with 5 airlines operating direct service from Chicago O'Hare (ORD) to San Diego International (SAN). Cheapest fares are usually in January (around $169 return), with peak prices in August (around $507). Departures on a Tuesday tend to undercut weekend prices on this corridor.
Flying from Chicago O'Hare
Chicago O'Hare is one of America's two busiest hubs and the home base for both United and American — Terminals 1 and 2 belong to United, Terminal 3 to American, and Terminal 5 handles all international arrivals. The CTA Blue Line runs from a station at the airport to downtown Loop in around 45 minutes for $5. Winter weather drives chronic delays from late November through February, so build in connection padding through ORD between Thanksgiving and President's Day.
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 ORD to SAN?
| Airline | IATA | Flight time | Cabin |
| United Airlines | UA | 3h 52m | Economy |
| American Airlines | AA | 3h 52m | Economy |
| Spirit Airlines | NK | 3h 52m | Economy |
| Frontier Airlines | F9 | 3h 52m | Economy |
| Delta Air Lines | DL | 3h 52m | Economy |
5 carriers fly direct on this corridor. Frequencies vary by season — summer and winter holiday peaks see additional flights.
Best time to fly ORD→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.
Chicago to San Diego FAQs
Direct flights from Chicago O'Hare (ORD) to San Diego International (SAN) take approximately 3h 52m for the 1720-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 $169. 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.
5 carriers operate direct service from Chicago O'Hare (ORD) to San Diego International (SAN): United Airlines, American Airlines, Spirit Airlines, Frontier Airlines and Delta Air Lines. 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.