Direct (nonstop) flights from Denver to San Diego
4 airlines fly nonstop from Denver International (DEN) to San Diego International Airport (SAN). It's 853 miles (1,372 km), about 2h 26m in the air. Operated by Alaska Airlines, Frontier Airlines, United Airlines and others.
Alaska Airlines
Frontier Airlines
United Airlines
Southwest Airlines
Route data last updated: May 28, 2026
Airlines with non-stop flights
AS
Alaska Airlines
F9
Frontier Airlines
UA
United Airlines
WN
Southwest Airlines
Alternative Routes
Other ways to fly from Denver to San Diego with one stop · direct emits 158 kg CO₂ per passenger
Looking for the return flight?
SAN → DEN: Flights from San Diego to DenverOther direct flights from Denver
Direct flights from San Diego (SAN)
Frequently Asked Questions
How long is the direct flight from Denver to San Diego?
A nonstop flight from Denver (DEN) to San Diego (SAN) takes approximately 2 hours and 26 minutes. The distance is 853 miles (1,372 km).
Which airlines fly nonstop from Denver to San Diego?
4 airlines: Alaska Airlines, Frontier Airlines, United Airlines, Southwest Airlines.
Is there a nonstop flight from Denver to San Diego?
Yes. 4 airlines: Alaska Airlines, Frontier Airlines, United Airlines, Southwest Airlines.
How far is Denver from San Diego?
The flight distance from Denver to San Diego is 853 miles (1,372 km), measured as the great-circle (shortest air) distance. That's roughly the same distance as London to Madrid.
What type of aircraft flies from Denver to San Diego?
At 2h 26m, this route typically uses narrow-body or mid-range jets — Boeing 737 MAX or Airbus A320neo. Varies by airline.
What is the carbon footprint of a flight from Denver to San Diego?
Roughly 158 kg CO2 per passenger one-way. That's about the same as driving 790 km.
Is the return flight from San Diego to Denver also nonstop?
Yes — nonstop flights run both ways. Flight time may differ slightly due to wind patterns.
When is the cheapest time to fly from Denver to San Diego?
Midweek flights (Tue/Wed) outside holiday peaks are usually cheapest. 3-6 weeks ahead is a good window for this route. Use "Check Prices" above to compare.
How early should I arrive at Denver International for this flight?
1.5-2 hours for domestic. Add more time during holidays or busy travel weekends.