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 | October |
Cheapest flight | $35 |
Direct departures
Denver Intl to San Diego
Monday
Air Canada, Copa Airlines, Frontier, +6 more
Air Canada, Copa Airlines, +7 more
5
6
Tuesday
Air Canada, Frontier, Lufthansa, +4 more
Air Canada, Frontier, +5 more
3
4
Wednesday
Air Canada, Frontier, Lufthansa, +6 more
Air Canada, Frontier, +7 more
5
6
Thursday
Air Canada, Copa Airlines, Frontier, +5 more
Air Canada, Copa Airlines, +6 more
4
5
Friday
Air Canada, Copa Airlines, Frontier, +6 more
Air Canada, Copa Airlines, +7 more
5
6
Saturday
Air Canada, Frontier, Lufthansa, +4 more
Air Canada, Frontier, +5 more
3
4
Sunday
Air Canada, Copa Airlines, Frontier, +5 more
Air Canada, Copa Airlines, +6 more
4
5
Direct returns
San Diego to Denver Intl
Monday
Air Canada, Copa Airlines, Frontier, +6 more
Air Canada, Copa Airlines, +7 more
5
6
Tuesday
Air Canada, Frontier, Lufthansa, +4 more
Air Canada, Frontier, +5 more
3
4
Wednesday
Air Canada, Frontier, Lufthansa, +6 more
Air Canada, Frontier, +7 more
5
6
Thursday
Air Canada, Copa Airlines, Frontier, +5 more
Air Canada, Copa Airlines, +6 more
4
5
Friday
Air Canada, Copa Airlines, Frontier, +6 more
Air Canada, Copa Airlines, +7 more
5
6
Saturday
Air Canada, Frontier, Lufthansa, +4 more
Air Canada, Frontier, +5 more
3
4
Sunday
Air Canada, Copa Airlines, Frontier, +5 more
Air Canada, Copa Airlines, +6 more
4
5
Very pleasant , a flight attendant Jo did a great job mixing me up a beverage and just brightened the trip .
Very pleasant , a flight attendant Jo did a great job mixing me up a beverage and just brightened the trip .
Spent 30 minutes in tarmac bcoz arrived earlier and crew nit ready for us. Told that the airport is being renovated so limited arrival space. 6 hours flight should have not two snacks but one major meal.
Flight attendant was rude when I advised her that the bathroom had no paper towels or tissue paper.
Departing flight to San Diego was delayed. Return flight from SD to SBP was delayed. Not terrible but not ideal
Good leg room, no problem with overhead storage and the staff was super helpful.
I purchased the internet during the flight and it stopped working after 1 hour, so I barely got to use it.
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.
Very smooth checking in our luggage with a super pleasant SW agent. I enjoyed a fun entertaining movie.
WiFi did not work. For as outrageous as these flights cost, when they’re advertised with certain services/ features they should be in working order
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!
Alaskan has always been great. Unfortunately, going TO Cabo, on Hawaiian, was a nightmare. But Alaskan has always been great.
Departure was two hours late! Better than four hours late on our first flight
My experience was pleasant. It was perfect. That is enough🥰💃💖
The flight was supposed to leave at 7:30pm, but departed 10:50pm. They kept moving departure time out every half hour. It was a 45 minute flight from n Sunday night with great weather.
I could not check in ahead of time. Kayak did not give me a proper confirmation number to check in.
I loved flying Hawaiian Air! We didn’t pay to sit together, but we were able to anyway. They had usb charging ports and even outlets in some seats. They served a hot sandwich that was not very good, but we were still pleasantly surprised. The staff was very nice. The seats really made my booty hurt but maybe I’m just not used to sitting so long. Also, the AC was really cold even though I was wearing pants, a hoodie, and a light blanket.
You did not have any vegetarians options for the free meal! I do not eat any meat of any kind! I asked the flight attendant and was met with kind of a rude statement like vegetarian? No we don’t have that kind of thing! Did not make me happy but made me feel like why would I want a vegetarian meal! Otherwise a good experience!
I was put in a middle seat with the people on either side of me kept passing their grandchild over me and talking back and forth while I was trying to rest or watch a movie. So inconsiderate and totally disturbing. I asked if they would sit next to each other to alleviate the constant impeding my comfort but they refused.
Late boarding, full flight. Absolutely no food and barely a bag of pretzels. No video screens and slim pickings of movies. No live tv and poor selection of shows.
Pre-Flight check-in Staff did a terrific job correcting a seat mis-assignment problem after I checked in the night before my flight. They really stepped up to make my flight home a joy. It was also my birthday, so the flight crew made me feel special a little treat.
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
What I expected, nickeled and dined and a frontier flight attendant loudly complained about her job and lack of communication as she headed to the gate on her cell phone. Not professional.
Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium
I’m not gonna fly Frontier Airlines because booking is not an option. No water or food is for high price, not equipped for health emergency incompetent crew for emergency services. Cheap airline shows it is cheaper in all service categories. Boarding is the best of all airlines!
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.
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