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.
$40+ 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — DEN
Jan 17 — Jan 241
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
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 October, booked 52 days in advance, depart on a Friday or Thursday and return on a Wednesday
Cheap 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 December 18, 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 December 18, 2025.
This Expedia deal was found by Cheapflights users on 12/16. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2310:52 amSAN - DEN
1 stop10h 52mFrontier
Tue 1/69:45 pmDEN - SAN
Nonstop2h 31mFrontier
Deal found 12/16![Frontier logo]()
$151
This deal was found by Cheapflights users on 12/17. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:25 amSAN - DEN
Nonstop2h 38mFrontier
Tue 1/61:02 pmDEN - SAN
Nonstop2h 32mFrontier
Deal found 12/17![Frontier logo]()
$159
This Frontier deal was found by Cheapflights users on 12/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2410:57 amSAN - DEN
1 stop5h 42mFrontier
Tue 12/306:15 amDEN - SAN
1 stop4h 42mFrontier
Deal found 12/16![Frontier logo]()
$162
This Priceline deal was found by Cheapflights users on 12/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/262:10 pmSAN - DEN
1 stop9h 15mFrontier
Wed 1/71:02 pmDEN - SAN
Nonstop2h 32mFrontier
Deal found 12/16![Frontier logo]()
$180
This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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.
Mon 12/292:10 pmSAN - DEN
1 stop9h 15mFrontier
Thu 1/16:35 amDEN - SAN
1 stop14h 49mFrontier
Deal found 12/17![Frontier logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/2410:57 amSAN - DEN
1 stop5h 42mFrontier
Thu 1/16:35 amDEN - SAN
1 stop14h 49mFrontier
Deal found 12/16![Frontier logo]()
$194
This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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 12/3110:57 amSAN - DEN
1 stop5h 42mFrontier
Mon 1/56:15 amDEN - SAN
1 stop8h 00mFrontier
Deal found 12/17![Frontier logo]()
$206
This Cheapflightsfares deal was found by Cheapflights users on 12/16. 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.
Thu 12/259:14 pmSAN - DEN
1 stop10h 41mFrontier
Mon 12/2910:37 pmDEN - SAN
1 stop14h 34mFrontier
Deal found 12/16![Frontier logo]()
$207
Find 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 December 18, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $58 (Frontier) |
One-way from | $40 (Priceline) |
Popular in | March |
Cheapest in | January |
Average price | $166 |
Good round-trip deal | $182 or less |
Good one-way deal | $108 or less |
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 December 18, 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
Thu 1/22
6:30 am-10:05 am
Nonstop2h 35m
Denver Intl
Mon 1/26
7:39 pm-9:14 pm
Nonstop2h 35m
$79
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Thu 1/22
6:30 am-10:05 am
Nonstop2h 35m
Denver Intl
Mon 1/26
3:46 pm-9:06 pm
1 stop6h 20m
$86
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Fri 1/30
6:30 am-10:05 am
Nonstop2h 35m
Denver Intl
Sun 2/1
6:00 am-10:25 am
1 stop5h 25m
$89
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Fri 1/16
4:56 pm-8:25 pm
Nonstop2h 29m
Denver Intl
Sun 1/18
6:00 am-10:08 am
1 stop5h 08m
$97
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Thu 1/8
11:10 am-2:41 pm
Nonstop2h 31m
Denver Intl
Sun 1/11
9:05 pm-10:37 pm
Nonstop2h 32m
$117
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Wed 1/14
1:35 pm-7:03 pm
1 stop4h 28m
Denver Intl
Wed 1/21
9:44 pm-2:01 pm
1 stop17h 17m
$145
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Wed 3/4
11:00 am-5:40 pm
1 stop5h 40m
Denver Intl
Mon 3/9
8:50 pm-10:20 pm
Nonstop2h 30m
$155
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Thu 1/22
6:15 am-11:35 pm
1 stop16h 20m
Denver Intl
Mon 1/26
7:39 pm-9:14 pm
Nonstop2h 35m
$191
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Sat 2/14
3:15 pm-10:37 pm
1 stop6h 22m
Denver Intl
Fri 2/20
6:12 pm-11:04 pm
1 stop5h 52m
$197
San DiegoDenver
SAN - DEN
SANDEN
San Diego
Tue 1/20
8:00 am-11:38 am
Nonstop2h 38m
$59
Showing 1-10 of 21 results
Compare providers for flights from San Diego to Denver
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from San Diego to Denver in December.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy- | Trust Score*1 star | |
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on San Diego-Denver flights, users find the pricing of CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on San Diego-Denver flight deals on Cheapflights vs. CheapOair >95% of the time. Price accuracy is based on data collected from San Diego-Denver flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on San Diego-Denver flights, Cheapflights users trust CheapOair the most. CheapOair has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for San Diego-Denver flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
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
Prices
Delays
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 December 12, 2025.
The best time to book flights from San Diego to Denver is 39 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, January is the cheapest month in which you can book a flight from San Diego to Denver (average of $24). Flying from San Diego to Denver in October is currently the most expensive (average of $68). 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 December 18, 2025.
It’s typically best to fly out from San Diego to Denver in the evening. Doing so could potentially save you 28% 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 December 13, 2025.
Travelers seeking maximum savings on their San Diego to Denver flight should consider departing on Thursday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
How often are flights from San Diego to Denver delayed?
About 16% of weekly flights between San Diego and Denver have experienced delays in the past year, with the average delay time being 141 minutes.
What is the most punctual flight time for San Diego to Denver flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Saturday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on San Diego to Denver flights?
Over the last year, United Airlines have had the lowest number of delays on this route, with just 12% of flights being delayed.
The best insider tips for San Diego to Denver flights
AI-powered summary based on content written by travel experts. AI can make mistakes.
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.
![Southwest]()
Southwest
Southwest offers free snacks and non-alcoholic drinks, enhancing the short-haul flight experience.
Enjoy free messaging and in-flight entertainment on your device with Southwest's Wi-Fi service.
Airports
Our travel experts
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 December 18, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Hawaiian Airlines from San Diego to Denver. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.0
Crew
8.5
Overall
8.0
Boarding
8.1
Food
7.1
Comfort
7.8
Reviews
1 / 20
2.0
MediocreArt,Dec 2025
SAN - OGG
Entertainment
7.0
Crew
8.5
Overall
8.0
Boarding
8.1
Food
7.1
Comfort
7.8
Reviews
1 / 20
2.0
MediocreArt,Dec 2025
SAN - OGG
Entertainment
7.0
Crew
8.5
Overall
8.0
Boarding
8.1
Food
7.1
Comfort
7.8
Reviews
1 / 20
2.0
MediocreArt,Dec 2025
SAN - OGG
Entertainment
7.0
Crew
8.5
Overall
8.0
Boarding
8.1
Food
7.1
Comfort
7.8
Reviews
1 / 20
2.0
MediocreArt,Dec 2025
SAN - OGG
Entertainment
7.0
Crew
8.5
Overall
8.0
Boarding
8.1
Food
7.1
Comfort
7.8
Reviews
1 / 20
2.0
MediocreArt,Dec 2025
SAN - OGG
Entertainment
7.0
Crew
8.5
Overall
8.0
Boarding
8.1
Food
7.1
Comfort
7.8
Reviews
1 / 20
2.0
MediocreArt,Dec 2025
SAN - OGG
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 Denver?
Book flights to Denver if you plan to visit one of these locationsBlack Hawk
Thornton
Broomfield
Westminster
Winter Park
Golden
Greeley
Lone Tree
Lakewood
Cripple Creek
Silverthorne
Central City
Frisco
Wheat Ridge
Manitou Springs
Fort Morgan
Brighton
Longmont
Idaho Springs
Evergreen
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 5 airlines flying from San Diego to Denver
Discover the top 5 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 December 18, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$58 | Average$158 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$68 | Average$192 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$102 | Average$189 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$123 | Average$257 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$143 | Average$305 | FlexibilityNo cancel fee | On-time69% |