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 | $46 |
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, Copa Airlines, Frontier, +4 more
Air Canada, Copa Airlines, +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, +3 more
Air Canada, Copa Airlines, +4 more
2
3
Good experience, although it was a little cramped being a tall person. Otherwise everything went smoothly and professionally though
Good experience, although it was a little cramped being a tall person. Otherwise everything went smoothly and professionally though
Big delay of over 7 hours on next leg of trip with Alaska. Would have been nice to have food or something
Horrible! No blanket or pillow available! We had bulkhead seats but the seats were worn out and no cushion old. No meal or even a sandwich for our 5 hour flight just a little bag of pretzels. Crabby attendant female with long brown hair. We will not book Alaska Airlines again
I do wish the the actual airplane I flew on was bigger. But, I made it work.
I loved that we boarded orderly and quickly, that I had an opportunity to check my bag free at the gate, that there was plenty of seat/leg room, there was smooth takeoff and landing, the attendants were pleasant and helpful, and that we arrived on time!!
We were in first class. Food was surprisingly good. Boarding was easy. Seats were lumpy. No video screen ...really? Service was good. Phone support was good
The staff and crew were excellent. The entire flight process was so friendly and smooth.
flight was canceled. don't cancel flights if you want a better score.
Missed connection due to waiting on tarmac for gate. Rebooking took 30 minutes in line with 2 people in line in front. Horrible inefficient careless staff.
The flight was canceled and very little help given at the check in desk. Everyone at the desk says: just go on the app and see how they rebooked you. I mean come on it’s embarrassing customer service.
First time traveling on Southwest since bag fees were implemented. Usual good service. Just more expensive now.
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.
Not a "Delta" issue, but a JFK issue: We booked a connecting flight with 3 1/2 hours between to clearn immigration and customs. Our inbound flight (BCN to JFK) was on the taxiway 45 minutes which ate into our layover time. Immigtration was insanely quick with the CBP MPC app; however, clearing TSA (again, after we were ALREADY cleared in Spain on the inbound international flight) took over 95 minutes. This left us with 10 minutes before boarding the connecting flight (JFK to SAN) to walk to the far end of Terminal 4 and try to find food. We didn't find any food that could promise to serve us in under 10 minutes so we boarded the Delta flight after coming off a plance and an 8-hour flight knowing that we wouldn't be served any food on the next 5 1/2 hour flight. I feel like Delta needs to put pressure on the JFK TSA to open more screening stations (by our count, we saw only 5 scanners open and a line of - as we said - over 90 minutes. The insult is that we WERE ALREADY SCREENED through TSA, but as you come off one flight into the USA, you have to go through the whole process again. It seems like if you have a connecting flight, there should be a way to pass through immigration and customs without needing to return through TSA.
There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2
Boarding was organised and relaxed. Crew were fantastic! Seats were lacking padding causing butt pain and stiffness.
5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.
The entertainment and wifi mostly didn't work on this flight.
Terrible entertainment system - kept freezing and audio kept cutting out. Snacks were mediocre at best for a 5 hour flight.
I am still upset that my bag was lost on a recent trip to Rome ; we were inconvenienced and out €150 Euros ; delta has refused to reimburse us
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
Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.
Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.
Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁
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
Very bad! No good service delayed my second connection flight
Frontier is terrible. Paid for exit row, not given exit row, refused to refund fee.
2 hour delay due to late plane, wrong size plane causing overbooking, and people getting off and on the plane after boarding was completed.
The worst. We never made our connection and they did absolutely nothing to help us at the airport.
I never got to experience the flight because they delayed my first flight and I missed this one. Then Frontier didn't want to help me rebook a flight to get me to my final destination.
The Boarding process in Denver was chaotic, and since the line was so long, we were lined up very far from the gate. If there were any announcements from the gate staff, we didn't hear them. The flight attendants were spectacular. The only negative part of the flight was sitting by a 2 1/2 year old who was unruly and unfortunately had parents that matched his behaviors. Also, the restaurants in Denver on the E concourse, they didn't have food (passengers could only order 1 item on the entire menu) or the restaurants had 12-14 people waiting for orders to be prepared and another 6 people waiting to order. If you have a layover in Denver and need to grab food, be prepared to visit the shops with pre-packaged sandwiches, or you can visit another concourse but it may take a while to transit throughout the airport.
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.
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