Find Frontier Airlines(F9) flights from Denver to San Diego

At the moment, you can catch a nonstop flight from Denver to San Diego with the following airlines, including: Frontier Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

It takes about 2 hours 43 minutes to fly from Denver to San Diego.

By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from Denver to San Diego is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

Based on Trip.com data in the past 4 weeks, there is 84 flight per week flying from Denver to San Diego. You can check the weekly schedule for popular airlines on this route below: Frontier Airlines: -/M/-/-/-/-/- -- F92421 (07:47)

The cheapest months to fly from Denver to San Diego is December, when demand for travel is lower.

After crunching the numbers on our September flight calendar, it's currently cheapest to fly from Denver to San Diego on September 29, 2026 with Frontier Airlines, with prices starting at US$34.

You can land at any one of the following hubs in San Diego: McClellan-Palomar Airport (CLD), Marine Corps Air Station Miramar (NKX), and San Diego International Airport (SAN). Flying from Denver International Airport to San Diego International Airport (DEN-SAN) is by far the most common option on this route.

The time difference between San Diego and Denver is 1h.

Tickets can only be changed or canceled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.