Cheap Flights from San Diego to Denver from $48

Frequently Asked Questions

• What are the cheapest flights from San Diego to Denver (SAN-DEN)?

  Based on Trip.com data, Frontier Airlines offers one-way fares as low as $48 on Cheapest nonstop routes (e.g. SAN to DEN on Wed, Aug 5), while Frontier Airlines offers Cheapest nonstop round-trips from $83 departing on Sun, Aug 2 and returning on Sun, Aug 9.

• Which airlines offer direct flights from San Diego to Denver?

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

• How long does it take to fly from San Diego (SAN) to Denver (DEN) and what is the distance?

  It takes around 2 hours 48 minutes to fly from San Diego (SAN) to Denver (DEN).

• When is the best time to book flights from San Diego to Denver?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from San Diego to Denver 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.

• How many flights are there per week from San Diego to Denver?

  Based on Trip.com data in the past 4 weeks, there is 93 flight per week flying from San Diego to Denver. You can check the weekly schedule for popular airlines on this route below: Frontier Airlines: S/M/T/W/T/F/S -- F92818 (06:34) United Airlines: S/M/T/W/T/F/S -- UA2476 (08:50)

• How can I find the best deals on flights from San Diego to Denver?

  To find best deals on flights from San Diego to Denver, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Wed, Aug 5, with one-way flights priced at just $48.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Denver travel is around July.
  · Get exclusive promo codes for Trip.com app users.

• When are flight tickets from San Diego (SAN) to Denver (DEN) the cheapest?

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

• Which upcoming date is cheapest to fly from San Diego to Denver on?

  After crunching the numbers on our June flight calendar, it's currently cheapest to fly from San Diego to Denver on June 20, 2026 with Frontier Airlines, with prices starting at $130.

• Which airports can I fly to for Denver from San Diego?

  You can land at any one of the following hubs in Denver, with San Diego International Airport to Denver International Airport (SAN-DEN) is by far the most common option on this route: Denver International Airport (DEN) Rocky Mountain Metropolitan Airport (BJC).

• Is there any time difference between San Diego and Denver?

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

• How do I change or cancel my ticket from San Diego to Denver?

  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.