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$46+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — DEN
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from San Diego to Denver Intl are usually found in January or October, booked 58 days in advance, depart on a Thursday or Friday 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 September 17, 2025.

Round-trip from

$81
(Kiwi.com)

One-way from

$46
(Hawaiian Airlines)

Popular in

March

Cheapest in

January

Average price

$185

Good round-trip deal

$146 or less

Good one-way deal

$111 or less
From San Diego to Denver Intl
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One-way flight from San Diego to Denver Intl
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Highest demand for flights based on searches. 4% potential increase in price ($9 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from San Diego to Denver Intl.
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Price to beat on a one-way flight from San Diego to Denver Intl.
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Find flight deals from San Diego to Denver

Cheapest flights from San Diego to Denver
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 September 17, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/16. 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.
Sat 10/112:24 pmSAN - DEN
Nonstop2h 33mFrontier
Fri 10/1710:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/16$81
This Cheapflightsfares deal was found by Cheapflights users on 9/17. 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.
Sat 10/252:24 pmSAN - DEN
Nonstop2h 33mFrontier
Tue 10/2812:00 pmDEN - SAN
Nonstop2h 28mFrontier
Deal found 9/17$82
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 11/136:00 pmSAN - DEN
Nonstop2h 34mFrontier
Mon 11/1710:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/16$84
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/86:41 amSAN - DEN
Nonstop2h 37mFrontier
Mon 10/1310:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/17$90
This Southwest deal was found by Cheapflights users on 9/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/76:50 pmSAN - DEN
Nonstop2h 25mSouthwest
Fri 10/248:10 pmDEN - SAN
Nonstop2h 20mSouthwest
Deal found 9/16$91
This Frontier deal was found by Cheapflights users on 9/16. 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.
Fri 9/266:25 amSAN - DEN
1 stop10h 57mFrontier
Wed 10/18:50 pmDEN - SAN
Nonstop2h 34mFrontier
Deal found 9/16$92
This Cheapflightsfares deal was found by Cheapflights users on 9/16. 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 10/96:41 amSAN - DEN
Nonstop2h 37mFrontier
Mon 10/1310:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/16$93
This Trip.com deal was found by Cheapflights users on 9/16. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/175:28 pmSAN - DEN
1 stop5h 34mFrontier
Tue 10/2110:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/16$94
This Trip.com deal was found by Cheapflights users on 9/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1410:32 amSAN - DEN
Nonstop2h 28mMultiple Airlines
Tue 10/2110:29 pmDEN - SAN
Nonstop2h 21mMultiple Airlines
Deal found 9/15$98
This Southwest deal was found by Cheapflights users on 9/17. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/164:35 pmSAN - DEN
1 stop4h 45mSouthwest
Sun 10/197:10 amDEN - SAN
Nonstop2h 25mSouthwest
Deal found 9/17$101
This Priceline deal was found by Cheapflights users on 9/17. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/910:52 amSAN - DEN
Nonstop2h 39mFrontier
Tue 10/1410:29 pmDEN - SAN
Nonstop2h 21mFrontier
Deal found 9/17$102
This United Airlines deal was found by Cheapflights users on 9/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/166:53 amSAN - DEN
Nonstop2h 28mUnited Airlines
Sun 10/197:47 amDEN - SAN
Nonstop2h 25mUnited Airlines
Deal found 9/16$103

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 September 17, 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 10/15

8:19 pm-11:47 pm

Nonstop2h 28m

Denver Intl

Tue 10/21

7:50 pm-9:19 pm

Nonstop2h 29m

$91

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Thu 10/16

8:50 pm-12:15 am

Nonstop2h 25m

Denver Intl

Mon 10/20

8:10 pm-9:30 pm

Nonstop2h 20m

$91

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Sat 11/1

3:48 pm-7:06 pm

Nonstop2h 18m

Denver Intl

Tue 11/4

7:04 pm-8:27 pm

Nonstop2h 23m

$91

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Thu 10/9

8:50 pm-12:15 am

Nonstop2h 25m

Denver Intl

Mon 10/13

9:40 pm-11:05 pm

Nonstop2h 25m

$91

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Tue 10/14

8:19 pm-11:47 pm

Nonstop2h 28m

Denver Intl

Tue 10/21

7:50 pm-9:19 pm

Nonstop2h 29m

$91

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Thu 10/16

8:50 pm-12:15 am

Nonstop2h 25m

Denver Intl

Thu 10/23

7:30 am-8:55 am

Nonstop2h 25m

$91

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Tue 10/14

5:10 pm-10:25 pm

1 stop4h 15m

Denver Intl

Tue 10/21

9:55 pm-11:20 pm

Nonstop2h 25m

$101

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Sat 1/31

7:10 am-1:50 pm

1 stop5h 40m

Denver Intl

Sat 2/7

8:05 am-9:45 am

Nonstop2h 40m

$101

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Wed 10/8

6:41 am-10:18 am

Nonstop2h 37m

Denver Intl

Sun 10/12

6:00 am-12:11 pm

1 stop7h 11m

$111

San DiegoDenver

SAN - DEN

SANDEN

San Diego

Fri 10/24

6:00 pm-12:29 am

1 stop5h 29m

Denver Intl

Fri 10/31

7:45 am-9:14 am

Nonstop2h 29m

$120

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 19 results
1
2

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'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.

Read more about Frontierby Marisa Garcia
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.

Read more about United Airlinesby Harriet Baskas
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.

Read more about Southwestby Marisa Garcia
Airports
SAN

Plan to arrive at SAN two hours before your flight to avoid stress from traffic and congestion near the airport.

Read more about SANby Blane Bachelor
DEN

Take the A Line train from DEN to Union Station for a quick, 37-minute ride into downtown Denver.

Read more about DENby Emily Zemler
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier and Southwest

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Blane Bachelor

Blane Bachelor

Expert on SAN

Blane Bachelor

Blane Bachelor

Blane Bachelor is a journalist and editor specializing in travel and aviation who writes regularly for top global outlets. Born and raised in Florida, Blane has worked and lived in four countries, including the Netherlands, where she’s currently based with her family. Her favorite way to get to know a new destination is by running or riding a bike around town – or hearing a spooky ghost story about local history. She will always choose the window seat.

Read more
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more

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 September 12, 2025.

The best time to book flights from San Diego to Denver is 58 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 September 17, 2025.

It’s typically best to fly out from San Diego to Denver in the evening. Doing so could potentially save you 36% 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 September 14, 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.

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 September 17, 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Hawaiian Airlines
7.8
Good
2,729 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,926 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Frontier
5.8
Fair
3,173 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Entertainment

7.1

Crew

8.5

Boarding

8.1

Food

7.1

Overall

8.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

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.

  • What airports do I use to fly from San Diego to Denver?

    You will need to book a flight from San Diego to Denver Intl if you want to fly from San Diego to Denver. At least 6 different airlines have flights from San Diego (SAN) to Denver Intl (DEN) on a regular basis. There are 20 flights to Denver from the San Diego airport per day. If you manage to book one that is nonstop, then you can expect the flight time from SAN to DEN to be around 2h 19m.

  • How popular is this San Diego to Denver flight route?

    This flight path from San Diego to Denver Intl was viewed by 182 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from San Diego to Denver?

    Alaska Airlines and Southwest can get you from San Diego to Denver in just under 2h 25m. Your travel time will be generally consistent. There are 852 mi between San Diego and Denver. Most flights are nonstop.

  • What are the cheapest airlines flying from San Diego to Denver round-trip?

    Frontier, at $68, was found to be the cheapest airline from San Diego to Denver.Alternate airlines to your destination round-trip include Hawaiian Airlines and Alaska Airlines. Frontier is priced at 64% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from San Diego to Denver one-way?

    One-way options have recently been found by users for as low as $46 on Hawaiian Airlines. Other airlines that offer cheap prices include United Airlines from $46 and Southwest from $55 one-way.

  • What are the most reliable airlines from San Diego to Denver?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from San Diego to Denver on time: SWISS (85%), Frontier (82%), Lufthansa (82%).

  • What are the cheapest flights from San Diego to Denver?

    While on average a flight from San Diego to Denver is generally $702, our data shows the cheapest flight currently is $51. When looking at the most popular route, (San Diego - Denver Intl), you can expect to pay $65 for that flight.

  • Can I find deals for flights from San Diego to Denver that include hotel bookings?

    Yes. In addition to deals on San Diego to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Diego to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Diego to Denver.

  • Can I find deals for business class flights from San Diego to Denver?

    Yes. Cheapflights offers flight deals from San Diego to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • 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.

See more FAQs

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Black Hawk
Westminster
Golden
Winter Park
Lakewood
Broomfield
Greeley
Lone Tree
Cripple Creek
Thornton
Silverthorne
Manitou Springs
Fort Morgan
Glendale
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker
Sterling

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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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$68Average$160FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$98Average$197FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$117Average$205FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$142Average$269FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$162Average$307FlexibilityNo cancel feeOn-time69%
DeltaCheapest$206Average$297FlexibilityNo cancel feeOn-timeN/A

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