Cheap Flights from San Diego International to Denver International

Compare San Diego International to Denver International flight deals

Find the cheapest month or even day of the year to fly to Denver International

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Flight deals from San Diego International to Denver International

Looking for a cheap last-minute deal or the best return flight from San Diego International Airport to Denver International Airport? If you want to travel next month, return fares start from R 1,440. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from San Diego International to Denver International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like San Diego International to Denver International flights are currently cheapest in September.

Direct flights from San Diego International to Denver International

San Diego International to Denver International: Alternative routes

Compare routes from San Diego International to Denver below. You may find an airport to fly into that's cheaper, faster, or easier than Denver International.

San Diego to Denver: Flight information

The things to know before you go.
Cheapest flight foundR 719
Cheapest month to flySeptember
Average flight time2 hrs, 27 mins
Most popular airlineSouthwest Airlines
Average flights per week218

Finding cheap flights from San Diego International to Denver International: Frequently asked questions

The best price we found for a return flight from San Diego International to Denver International is R 1,343. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 27 minutes is the average flight time from San Diego International to Denver International.
Southwest Airlines, Alaska Airlines and United fly direct from San Diego International to Denver International.
As of July 2026, there are 218 flights per week flying from San Diego International to Denver International.
The cheapest month to fly from San Diego International to Denver International is usually October.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Diego International Airport to Denver International Airport on Wednesday, 7 October 2026.
Yes – the average flight time is 2 hours and 27 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Denver International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Denver is around 40 days in advance, so don’t leave your flight to the last minute.

Currently, Frontier Airlines offers the cheapest flight tickets to Denver International.

Travelling from San Diego International Airport (SAN) to Denver International Airport (DEN): what you need to know

  • Hop on a direct flight from San Diego International Airport to Denver International Airport and you'll be in the air for an average of 2 hours 25 minutes.

  • The timezone in Denver is UTC-7, which is one hour ahead of San Diego.

  • Each week, there are 92 San Diego International Airport to Denver International Airport flights.

  • Your SAN to DEN flight won't wait if you're running late, so be at the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're travelling internationally.

  • Flying during a peak month like August? School holidays and other popular seasons can result in longer queues at security. Play things extra safe and get there up to four hours ahead of international flights and two hours before domestic departures.

  • A variety of airlines operate direct flights from San Diego International Airport to Denver International Airport, so getting to Denver (and then discovering more of the United States!) is easy. Popular carriers that fly nonstop include:

  • United is the most frequently booked airline on this route.

  • United ranks as the top on-time carrier for SAN to DEN flights, with 83.85% of services arriving as scheduled.

  • We make it easy to book a flight with a stopover. To see all your options for tickets from San Diego International Airport to Denver International Airport, deselect 'Direct flights only.' Then, choose a flight that has a stop long enough to tour your chosen city. Stopovers between SAN and DEN include:

    • Phoenix Sky Harbour Airport

    • Harry Reid International Airport

    • Colorado Springs Peterson Field Airport

How to find the cheapest flights from San Diego International Airport (SAN) to Denver International Airport (DEN)

  • The cheapest price we've found for a one-way San Diego International Airport to Denver International Airport flight is R 719. A return plane ticket is currently R 1,343. Depending on the availability and when you book, these fares could change.

  • To find cheap tickets from SAN to DEN, book as early as you can. Airlines usually offer lower fares when flights are first made available.

  • May is the cheapest month for flights from San Diego International Airport to Denver International Airport. If you're looking to fly at a different time of year, the 'Whole month' tool will show you the lowest prices for each month.

  • You don't need to check every day to see if fares have gone down when you set up a Price Alert. We'll update you as soon as a special offer becomes available on cheap flights from SAN to DEN.

  • Pick your ideal departure and arrival times, number of stops and airlines with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from San Diego International Airport to Denver International Airport.

Handy information about San Diego International Airport (SAN)

  • You'll find SAN at N Harbour Dr.

  • Of the flights that depart from San Diego International Airport, 74% land on time at their destination.

  • Central San Diego to San Diego International Airport is approximately 5 kilometres. Depending on traffic, it'll take you about 15 minutes to get there if you're driving, catching a taxi or ride-sharing.

  • Expect a trip time of around 25 minutes on public transport.

  • Get your break off to a stress-free start by staying near SAN. Whether you're catching an early flight from San Diego International Airport to Denver International Airport or just don't want to be rushed, these stays have you covered:

Arriving at Denver International Airport (DEN)

  • Consider staying at Baymont by Wyndham Denver International Airport after your San Diego International Airport to Denver International Airport flight. It's a short drive from DEN and a good option if you're eager to get some sleep right away.

  • Hit the road running by picking up a Denver International Airport rental car. Grab your wheels from Routes Car Rentals, Dollar or Budget and experience the lesser-explored corners of Denver and beyond.

  • Reserving your ride from Denver International Airport around one week in advance can help you secure the lowest rate.

Getting from Denver International Airport (DEN) to central Denver

  • DEN is located at 8500 Pena Boulevard.

  • From Denver International Airport, Denver is approximately 40 kilometres away. It takes around 35 minutes to reach the centre driving.

  • When travelling on public transport, expect a journey of around 35 minutes.

When to fly to Denver International Airport (DEN)

  • July is the busiest month for flights from San Diego International Airport to Denver International Airport. For a quieter experience, visit Denver in January.

  • Book your flight from San Diego International Airport to Denver International Airport for July if you want to visit Denver during its warmest month. You can expect temperatures of between 14ºC (57ºF) and 32ºC (90ºF).

  • January sees average temperatures of between -9ºC (16ºF) and 7ºC (45ºF). Search for cheap tickets from SAN to DEN sometime then if you want to travel in cooler conditions.

Explore more of the United States

  • You've visited Denver, now it's time to explore other corners of the United States. Journey about 105 kilometres south to Colorado Springs to tick off its leading attractions. From Garden of the Gods to Pikes Peak Region Attractions and Red Rock Canyon, you've got a jam-packed schedule ahead.

  • If you're looking to explore another major destination in the United States, consider Aurora, about 13 kilometres east of Denver. Plains Conservation Centre, DeLaney Homestead Historic District and Aircraft viewing are among its highlights.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.