Cheap Flights from San Diego International to Denver

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Flight deals from San Diego International to Denver

Looking for a cheap last-minute deal or the best return flight from San Diego International to Denver? Find the lowest prices on one-way and return tickets right here.

Denver.$76 per passenger.Departing Wed, 8 Apr, returning Wed, 15 Apr.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Diego International on Wed, 8 Apr, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Wed, 15 Apr, arriving in San Diego International.Price includes taxes and charges.From $76, select.

Denver.$76 per passenger.Departing Wed, 13 May, returning Wed, 20 May.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Diego International on Wed, 13 May, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Wed, 20 May, arriving in San Diego International.Price includes taxes and charges.From $76, select.

Denver.$76 per passenger.Departing Mon, 9 Mar, returning Mon, 16 Mar.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Diego International on Mon, 9 Mar, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Mon, 16 Mar, arriving in San Diego International.Price includes taxes and charges.From $76, select.

Denver.$93 per passenger.Departing Thu, 30 Apr, returning Sun, 3 May.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Diego International on Thu, 30 Apr, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sun, 3 May, arriving in San Diego International.Price includes taxes and charges.From $93, select.

Denver.$116 per passenger.Departing Mon, 30 Mar, returning Sat, 4 Apr.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Diego International on Mon, 30 Mar, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sat, 4 Apr, arriving in San Diego International.Price includes taxes and charges.From $116, select.

Denver.$127 per passenger.Departing Thu, 26 Feb, returning Sun, 8 Mar.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Diego International on Thu, 26 Feb, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Sun, 8 Mar, arriving in San Diego International.Price includes taxes and charges.From $127, select.

Denver.$179 per passenger.Departing Mon, 23 Feb, returning Thu, 26 Feb.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Diego International on Mon, 23 Feb, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Thu, 26 Feb, arriving in San Diego International.Price includes taxes and charges.From $179, select.

Denver.$261 per passenger.Departing Tue, 2 Jun, returning Thu, 4 Jun.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from San Diego International on Tue, 2 Jun, arriving in Denver International.Inbound direct flight with Frontier Airlines departs from Denver International on Thu, 4 Jun, arriving in San Diego International.Price includes taxes and charges.From $261, select.

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

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 flights are currently cheapest in March.

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Direct flights from San Diego International to Denver

Alternative San Diego International to Denver routes

Looking for the cheapest, fastest or easiest route from San Diego International to Denver? You could fly into the following airports instead.

San Diego to Denver: Flight information

The things to know before you go.

Cheapest flight found	$76
Cheapest month to fly	March
Average flight time	2 hrs, 28 mins
Most popular airline	Southwest Airlines
Average flights per week	245

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

How many airports are there in Denver?

There are 4 airports in Denver: Denver Arapahoe Co, Broomfield, Denver International, and Northern Colorado Regional.

How much are return flights from San Diego International to Denver?

The best price we found for a return flight from San Diego International to Denver is $76. 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.

How long does it take to fly from San Diego International to Denver?

2 hours and 28 minutes is the average flight time from San Diego International to Denver.

Which airlines fly direct from San Diego International to Denver?

Southwest Airlines, Alaska Airlines and United fly direct from San Diego International to Denver.

How many flights are there a week from San Diego International to Denver?

As of February 2026, there are 490 flights per week flying from San Diego International to Denver.

When is the cheapest time to fly from San Diego International to Denver?

The cheapest month to fly from San Diego International to Denver is usually March.

Which is the cheapest airport to fly into in Denver?

If you're flying from San Diego International Airport, the cheapest airport near Denver is Denver International – which is 29.9 km away from the centre of Denver. We've found flights into this airport from $76.

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

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from San Diego International Airport to Denver on Monday, 9 March 2026.

Can I get a direct flight from San Diego International Airport to Denver?

Yes – the average flight time is 2 hours and 28 minutes.

How can I get the best flight deal from San Diego International Airport to Denver?

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 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.

When is the best time to book flights to Denver?

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.

What’s the weather like in Denver?

In February, the average temperature is usually around 0°C. July is typically the warmest month in Denver, when it usually averages around 31°C. You can expect the least rain in January. The coldest month is December, with temperatures averaging -6°C. The rainiest month is July.

Which is the cheapest airline to fly from San Diego International Airport to Denver with?

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

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

The average time for a direct flight from San Diego International Airport to Denver is 2 hours 25 minutes.
Denver is one hour ahead of San Diego, where San Diego International Airport is located. Denver follows the UTC-6 timezone.
San Diego International Airport (SAN) to Denver International Airport (DEN) is the most traveled route, with 78 weekly flights to pick from. If you have things to finalize before heading off, the last flight from SAN to DEN is with Southwest Airlines at 21:40. Opt for the first departure operated by Southwest Airlines at 06:20 if you want to get on your way earlier.
Give yourself plenty of time to catch your SAN to Denver flight. Generally, it's best to arrive at least two hours before international departures and an hour ahead for domestic flights.
If you're heading away during a bank holiday or another peak period, allow extra time. A good rule is two hours before domestic flights and up to four hours before international departures. Check-in and security lines will be longer.
You can book a direct San Diego International Airport to Denver ticket. Start your journey at SAN and touch down at Denver International Airport (DEN).
Leading airlines that offer direct flights from San Diego International Airport to Denver include:
SAN is about 3 kilometres from central San Diego. If you're driving, catching a cab or ride-sharing from the centre, it'll take 10 minutes or so to get there, depending on traffic conditions. If you're using public transport, expect the journey time to be around 20 minutes.
Looking for a hotel close to SAN? If you've booked an early flight from San Diego International Airport to Denver, these accommodation options will get you from your pillow to the plane in no time:
71.38% of flights that take off from San Diego International Airport touch down at their destination on schedule.
You'll find SAN at N Harbour Dr.

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

$38 is currently the best price for a one-way San Diego International Airport to Denver flight. A return flight ticket starts at $76. These fares may change depending on availability.
Get cheap flights from SAN to Denver by booking one month ahead. According to our research, that's the sweet spot for picking up a bargain.
May is the best month for landing an amazing deal on San Diego International Airport to Denver tickets. If you'd like to travel at a different time of year, the 'Whole month' tool will give you the lowest prices across every month.
You don't need to check back constantly to find out if fares have dropped when you create a Price Alert. We'll notify you when there's an even bigger deal on cheap flights from SAN to Denver.
Save money on your flight from San Diego International Airport to Denver with the help of our filters. Choose your ideal duration, departure time and airlines, then sort the results by 'Cheapest' to see the best deals.

Airports in Denver

Denver International Airport (DEN)

Denver International Airport (DEN) to the centre of Denver takes about 35 minutes to reach by car. The centre is roughly 40 kilometres away.
It takes around 1 hour 30 minutes when travelling by public transport.
Jump off your flight from San Diego International Airport to Denver and be tucked up in your hotel bed soon after. If you're searching for a comfortable option just a quick drive from DEN, consider Baymont by Wyndham Denver International Airport.
Follow your own route with a Denver International Airport rental car. Pick up your wheels from Routes Car Rentals, Dollar or Budget and discover more of Denver and beyond.
Booking your ride from Denver International Airport about one week in advance of your flight from SAN to Denver can help you lock in the lowest rate.
You'll find DEN at 8500 Pena Boulevard.

Best time to go to Denver

Before you book your flights from San Diego International Airport to Denver, consider which time of year is best for you. Peak season in Denver offers a lively atmosphere and plenty to do, while low season means you'll get cheaper hotel rates and smaller crowds.
When booking your San Diego International Airport to Denver flight ticket, think about the kind of weather you prefer. July is the warmest month in Denver, with temperatures ranging from 14ºC to 32ºC.
Search for cheap tickets from SAN to Denver in January if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -9ºC and 7ºC on average.

More about Denver

Once you've booked your flight from San Diego International Airport to Denver, choose a hotel that combines comfort with a great location. Make one of these options your base for exploring Denver:
Every great journey has to include a little sightseeing. Union Station, Denver Art Museum and Denver Botanic Gardens are must-do's during your Denver adventure.

Explore more of United States

Denver is easy to fall in love with, but there are so many other parts of United States just waiting to be explored. Around 105 kilometres south of Denver, a trip to Colorado Springs will keep your itinerary packed. Start with leading attractions like US Northern Command (USNORTHCOM) / North American Aerospace Defence Command (NORAD) Headquarters, Cheyenne Mountain Air Force Station and National Strength and Conditioning Association (NSCA).
If you're eager to discover another well-known destination in United States, head for Pueblo, about 161 kilometres south of Denver. Pueblo Weisbrod Aircraft Museum, Rosemount Museum and Pueblo Zoo are the start of reasons to visit.