Frontier's UpFront Plus offers a guaranteed empty middle seat for added comfort.
Frontier's Zone 1 boarding available with carry-on purchase or special fare bundle.
$78+ Cheap flights from San Diego to Denver (SAN - DEN)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — DEN
Jun 17 — Jun 241
1 adult, Economy
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Find cheap flights from San Diego to Denver with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheapflights Tip: The best prices from San Diego to Denver Intl are usually found in January or February, booked 44 days in advance, depart on a Saturday or Thursday and return on a Tuesday
Cheap flight deals from San Diego to Denver
Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 12, 2025.
Round-trip from | $127 (Cheapflightsfares) |
|---|---|
One-way from | $79 (United Airlines) |
Popular in | March |
Cheapest in | January |
Average price | $235 |
Good round-trip deal | $207 or less |
Good one-way deal | $116 or less |
Find flight deals from San Diego to Denver
Cheapest flights from San Diego to DenverExplore the most affordable flight options available from San Diego to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.
Explore the most affordable flight options available from San Diego to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.
This Cheapflightsfares deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/96:25 amSAN - DEN
Nonstop2h 37mFrontier
Wed 7/169:44 amDEN - SAN
Nonstop2h 26mFrontier
Deal found 6/10![Frontier logo]()
$127
This American Airlines deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/238:15 amSAN - DEN
1 stop5h 12mAmerican Airlines
Sat 9/273:07 pmDEN - SAN
1 stop5h 17mAmerican Airlines
Deal found 6/12![American Airlines logo]()
$177
This Delta deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/269:59 amSAN - DEN
1 stop7h 18mDelta
Sat 8/25:30 amDEN - SAN
1 stop4h 08mDelta
Deal found 6/11![Delta logo]()
$217
This Southwest deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/136:30 amSAN - DEN
Nonstop2h 30mSouthwest
Mon 12/151:30 pmDEN - SAN
1 stop4h 25mSouthwest
Deal found 6/10![Southwest logo]()
$266
This Alaska Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/238:05 amSAN - DEN
2 stops11h 22mAlaska Airlines
Wed 9/249:23 pmDEN - SAN
1 stop13h 51mAlaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$282
Cheapflights Fare Finder
Customize your flight search to find flights from San Diego to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from San Diego to Denver that are best for you.
Fly from
San Diego
Fly to
Denver
Route
Depart
Return
Price
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Wed 7/9
6:25 am-10:02 am
Nonstop2h 37m
Denver Intl
Wed 7/16
9:44 am-11:10 am
Nonstop2h 26m
$127
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 9/23
8:15 am-2:27 pm
1 stop5h 12m
Denver Intl
Sat 9/27
3:07 pm-7:24 pm
1 stop5h 17m
$177
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Sat 7/26
9:45 am-3:00 pm
1 stop4h 15m
Denver Intl
Tue 8/12
7:21 pm-10:54 pm
1 stop4h 33m
$217
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 7/29
7:35 pm-11:00 pm
Nonstop2h 25m
Denver Intl
Thu 7/31
5:35 am-9:15 am
1 stop4h 40m
$225
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 9/23
8:05 am-8:27 pm
2 stops11h 22m
Denver Intl
Wed 9/24
9:23 pm-10:14 am
1 stop13h 51m
$282
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 10/14
8:19 pm-11:47 pm
Nonstop2h 28m
$78
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 9/16
12:52 pm-4:20 pm
Nonstop2h 28m
$79
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Mon 8/11
1:03 pm-4:00 am
1 stop13h 57m
$82
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 7/8
6:15 am-7:19 pm
1 stop12h 04m
$83
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 10/14
10:24 am-6:08 pm
1 stop6h 44m
$88
Showing 1-10 of 13 results
The best insider tips for San Diego to Denver flights
Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your San Diego to Denver trip
Airlines
![Frontier]()
Frontier
![United Airlines]()
United Airlines
United's Economy Plus offers extra legroom, ideal for comfort on short flights.
United's Basic Economy restricts carry-ons; consider this when booking.
Airports
Our travel experts
Best time to book a flight from San Diego to Denver
Have a flexible travel schedule? Discover the best time to fly to Denver from San Diego with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from San Diego to Denver
How far ahead should I book a flight from San Diego to Denver?
Use this chart to determine the optimal time to book a round-trip flight from San Diego to Denver. Price data was last updated on June 9, 2025.
The best time to book flights from San Diego to Denver is 44 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from San Diego to Denver?
Currently, October is the cheapest month in which you can book a flight from San Diego to Denver (average of $197). Flying from San Diego to Denver in March is currently the most expensive (average of $278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from SAN to DEN?
Find hourly flight availability from San Diego to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.
It’s typically best to fly out from San Diego to Denver in the evening. Doing so could potentially save you 39% on the flight price compared to flying in the afternoon, which is usually more expensive.
What is the cheapest day to fly from San Diego to Denver?
Use this chart to determine the cheapest time to fly round-trip from San Diego to Denver. Price data was last updated on June 8, 2025.
Travelers seeking maximum savings on their San Diego to Denver flight should consider departing on Saturday evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from San Diego to Denver
Explore weekly flight availability from San Diego to Denver. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 12, 2025.
The most flights from SAN to DEN are scheduled on a Thursday (26 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 on average).
Rainfall in Denver by month
Plan your trip to Denver by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Denver ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Denver when rainfall is around 0.5 in.
Temperature in Denver by month
Plan your trip to Denver by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Denver, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).
Reviews of airlines servicing Denver
Get insights into the airlines that provide service to Denver. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Denver. Reviews last updated June 12, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from San Diego to Denver to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Entertainment
7.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Entertainment
7.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Entertainment
7.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Entertainment
7.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Entertainment
7.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Entertainment
7.1
Crew
8.5
Reviews
1 / 20
10.0
ExcellentJames,Apr 2025
LAX - SFO
Related info for your journey
Find useful and relevant information for your journey from San Diego to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near San Diego?
Book flights to San Diego if you plan to visit one of these locationsWestminster
Black Hawk
Winter Park
Lakewood
Cripple Creek
Golden
Brighton
Silverthorne
Thornton
Frisco
Grand Lake
Broomfield
Central City
Glendale
Copper Mountain
Wheat Ridge
Longmont
Idaho Springs
Greeley
Limon
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for San Diego to Denver
See prices for flight routes from nearby airports that may be better suited for you.
Top 6 airlines flying from San Diego to Denver
Discover the top 6 airlines that operate flights from San Diego to Denver. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$156 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$167 | Average$305 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$176 | Average$274 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$177 | Average$245 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$196 | Average$306 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$197 | Average$325 | FlexibilityNo cancel fee | On-time71% |