Frontier's Economy Bundle includes a carry-on and seat choice, ideal for budget travelers.
Frontier's Premium Bundle offers extra legroom and priority boarding for just $20 more.
Planning a trip from Denver to San Diego? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.
Low season | January |
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High season | July |
Cheapest flight | $62 |
Find which airlines fly direct from Denver Intl Airport to San Diego Airport, which days they fly and book direct flights.
Direct departures
Denver Intl to San Diego
Monday
Air Canada, Copa Airlines, Frontier, +4 more
Air Canada, Copa Airlines, +5 more
3
4
Tuesday
Air Canada, Frontier, Lufthansa, +2 more
Air Canada, Frontier, +3 more
1
2
Wednesday
Air Canada, Copa Airlines, Frontier, +4 more
Air Canada, Copa Airlines, +5 more
3
4
Thursday
Air Canada, Copa Airlines, Frontier, +3 more
Air Canada, Copa Airlines, +4 more
2
3
Friday
Air Canada, Copa Airlines, Frontier, +4 more
Air Canada, Copa Airlines, +5 more
3
4
Saturday
Air Canada, Copa Airlines, Frontier, +3 more
Air Canada, Copa Airlines, +4 more
2
3
Sunday
Air Canada, Frontier, Lufthansa, +4 more
Air Canada, Frontier, +5 more
3
4
Direct returns
San Diego to Denver Intl
Monday
Air Canada, Copa Airlines, Frontier, +4 more
Air Canada, Copa Airlines, +5 more
3
4
Tuesday
Air Canada, Frontier, Lufthansa, +2 more
Air Canada, Frontier, +3 more
1
2
Wednesday
Air Canada, Copa Airlines, Frontier, +4 more
Air Canada, Copa Airlines, +5 more
3
4
Thursday
Air Canada, Copa Airlines, Frontier, +3 more
Air Canada, Copa Airlines, +4 more
2
3
Friday
Air Canada, Copa Airlines, Frontier, +4 more
Air Canada, Copa Airlines, +5 more
3
4
Saturday
Air Canada, Copa Airlines, Frontier, +3 more
Air Canada, Copa Airlines, +4 more
2
3
Sunday
Air Canada, Copa Airlines, Frontier, +4 more
Air Canada, Copa Airlines, +5 more
3
4
I would have liked to arrive on time - not 5 hours late!
I would have liked to arrive on time - not 5 hours late!
It was a perfect flight in all aspects! Both legs!
Boarding process, crew were good. But the seats were so uncomfortable that was all I could focus on. I literally had to sit forward so that all 3 of us could fit in row. I will try to avoid Southwest in the future for any flights over 60 minutes.
1.5 hour delay, poor service, no compassion from the crew. Terrible experience
Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.
Great experience flying Southwest. The crew was really kind and helpful, and very friendly with our toddler.
Our flight was diverted from being a non-stop to getting within 150 miles and requiring another plane. We heard 4 or 5 different versions from SW as to why we had to stop, then wait for a replacement plane. Five hour delay, weather did not come up as a single excuse.... communication was not clear and well explained. No one really took charge!
Plane late from DC to Austin 30 minutes. Crew made up much of the time enroute to San Diego.
I really like open seating. I hate that I've heard this is going away. This is one of the unique things that makes Southwest my goto choice.
Fine, but how to board on SW versus othrr airlines, is just lame. Goood staff though and all was solid otherwise.
This had nothing to do with Delta… The flights were on time and flawless. The service was excellent. We purchased seats in (aisle/middle) comfort plus since this was a cross country flight. Unfortunately, the woman seated at the window was 300+ pounds and, as might be expected, covered up about a third of the middle seat also. there was absolutely nothing that Delta could have done about that… I just don’t know what the answer should be. If you purchase a seat, you should should be able to use the entire seat and not just the portion that someone else is not sitting/oozing in. Disappointing…there should be something that could be done….I'm just not sure what solution could be.
Flights on time. .Ride was as comfortable as can be expected in steerage. Luggage arrived at destination. Attendants were fairly friendly.
Seats are much much more comfortable than United, which is what I usually fly
If I pay extra for "comfort+" I expect leg room where I can stretch my legs. I was seated with an attendant's seat blocking my feet. Knee space was fine but my feet had less room than the non-"comfort+" seats. Also, don't go cheap on food when you have flights of 3+ hours. It's insulting.
Only one side of the heafphone jack work. Crew was friendly and helpful.
Great. Flight departed early and arrived early. Deplaning and baggage claim ww were quick.
They separated our seats and moved us to the back of the plane. Hundreds of dollars and thousands of miles used and this was my platinum member experience.
AC barely worked on a 50 minute flight. It was very warm the whole flight. Flight was very bumpy and hard landing.
Got on the plane and then needed to deboard the plane because they didn’t have any pilots?
The flight was canceled two hours before departure, it took over five hours to rebook us on another flight.
Electric plugs didn't work. Entertainment system wasn't working
The design of the light switch on the arm rest is ridiculous.
The gate attendant let me walk right by her with a bag too big for the overhead compartment
Overall, it was a good experience. Boarding was good and there was plenty of overhead bin space for everyone’s carryons (even when we boarded toward the end). Only improvement would be to offer trash service more regularly.
David went above and beyond to make our flight the best that it could be
Was a pain having to leave the plane and reboard but glad the plane was fixed
No food service almost missed because of first flight delays
Had a hard time finding my assigned seat. No attendants to assist.
The negative was the wait at the airport coming back. I checked my bags in, an hour before boarding and I get the notification that my flight was delayed. Rather had gotten the notification while I was at the hotel. Then it was delayed 3 x’s. Ugh!
Plane still had screens for watching movies. Good selection too.
Any sort of gluten free snack option would be nice
One bottle of water and a package of cookies for comfort plus. We had to literally beg a flight attendant for an extra bottle of water later in the flight due to feeling dehydrated.
Flight boarded from Gate 39 at OGG, the farthest gate in the terminal. There were no Hawaiian themed amenities for the flight. The first class service was mediocre at best; I received not special welcome or recognition as an executive platinum member of American Advantage program. The flight attendants were more concerned with their cell phones than saying "thank you" to the passengers as we disembarked. Fortunately, the flight arrived at LAX a few minutes early.
Bigger seats. Board back to front! Disembark front to back!
Extraordinary service in business class, and very good breakfast and snacks. A really lovely flight.
Crew was late. Baggage was late. 2hs inside the plane waiting fro de-icing and traffic. A 3:30hs flight ended up being almost 6hs inside the airplane.
This flight didn’t happen because AA agents didn’t let us board the flight
Plane was pretty clean, staff was friendly and helpful, flight left about on time arrived early. Took a long time to board and get off the plane - carry on items didn't have enough room so people had to move all around to find places.
The service and food needs to improve to catch up with other international flights
Would have been good to have a meal since it was a 5.5 hour flight
Everything went as planned. Crew was great. Seats were still not that comfortable.
they delayed my flight which ended up, causing my layover flight to leave without me, resulting in me missing a flight and having to stay overnight in Houston international. I got no compensation other than a flight to my original location only a day later. i’ve never experienced such a unprofessional situation
The seats were extremely hard and uncomfortable, even for a budget airline.
Boarding was very well executed. Got my bag right away.
Overall experience good. There was no food and seats were not terribly comfortable.
There was nothing to like, flight delayed had to move to different departure areas, disorganized to say the leasr
I went to the Frontier counter in San Jose at 1030am or so on Sunday 10/13/24 to see if I could get an earlier flight to San Diego in lieu of my reserved 630pm flight. One thing led to another, and I was able to obtain an open seat for about $ 56. on the earlier flight. Fine. Then the agent asked if I "was checking a bag". Not knowing that carry-ons cost extra per Frontier policy, I thought that she meant a regular checked bag. Therefore, I said no. Once I got to the gate, the same gate agent who sold me a ticket told me that I had to pay $99 for a carry-on, and that all bags were extra on Frontier. Having never flown on Frontier, I was not aware of this. Part of the issue was that she was not a native English speaker, so there was a miscommunication as to what "bag" meant. I would have preferred for her to have clearly let me know at the front counter that any bag including a carry-on cost $99. It would have had the same outcome, as I had to take my carry-on. But it got hectic at the last minute at the gate itself. The baggage policy should have mentioned "including carry-ons" when we first spoke.
There were a lot of issues every step of the process. Check in, security, boarding, and dealing with luggage. Plus the money you think you are saving you end up using in hidden fees.
The flight attendant was arguing with a passenger before takeoff. The passenger was frustrated but the flight attendant should have handled it with grace, but instead she was nasty and rude. The seats were comfortable and the flight was uneventful. I wish we didn’t have to pay for drinks or snacks but that’s what you get with a budget airline.
Literally everything could have been better. Why are the planes always late?
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