Find Cheap Flights from Colorado to San Francisco

Pros: Gate crew at Denver on May 2nd (afternoon) were just disorganized and confused. She was just stressed out for no reason. Seems like not a people's person and can't stay calm at ALL. Can't handle stress at all

Pros: Not to much

Cons: Was like riding a city bus. Even in row one didn't have much room to stretch out. Check in took awhile. Only thing they had going for them was good pilots and staff. But the planes are trash no entertainment, little selection of food and drinks. Don't suggest at all.

Cons: lack of comfort ... 1 hour delay in baggage ... kiosks did not work for checking in

Pros: Arrived 40 minutes early so can't be too sad about that especially since a gate was available immediately. Jet bridge in SF was heated but in Denver where it was colder and he had to wait it was not. The check in lady clearly did not care about her job at all I'm Denver. Frontier is a budget airline which for this trip worked for me as I was able to pack everything in a "personal item" and don't mind sitting in the back of the plane, I got lucky and got asigned a window seat. No drinks offeed without a charge which I don't agree with but again you get what you pay for. And it's way better than Spirit.

Pros: it delay 9 hours.

Pros: Nothing

Cons: Our flight was delayed which caused us to miss our international connection. Flight attendants did not care, did not attempt to get us out faster, or put on a different flight. Asked for an announcement to be made on board or to be moved to seats closer to the front so we could get off the plane quicker, did not happen. Offboarded and sprinted across the airport for our international connection and was notified by gate attendents that the gate closed five minutes ago and that they could not let us on the plane. Meanwhile, the plane sat there for an additional 30 minutes while it fueled and waited for release from air traffic control. There were six travelers total stuck there in San Fran at that gate, all of us begging to be let on the plane to Beijing, the last one for over 24 hours. Zero compassion from staff at the the airline gate. They did not care about us and did not care about leaving their travelers stranded. Our total travel was Denver to Bangkok, 26 hours of travel including layovers in San Fran and Beijing. In San Fran (after missing the gate connection), United rerouted us through Haiwaii and the customer service agent that did this reroute did not finish the reroute to our final destination. We got to Haiwaii and were stranded again, at the United service desk for four hours having to once again provide documentation of our initial travel plans to Bangkok, having them build a new itinerary to our final destination. Overall, 20 additional travel hours have been added to our itinerary, almost double our initial travel time. We have had to call and cancel pre-arranged bookings in Thailand as we are now missing two full days off our trip. I am absolutely disappointed and heart broken as I write this still stuck in the Beijing airport waiting another six hours to connect to Bangkok. My fiancé and I were traveling to Thailand to get married and have received no compassion from anyone at this airline to try and get us there. I fly United for work quite frequently and have never experienced such horrendous service and lack of basic human compassion. I am flat out disgusted by United and will not be using them again, for personal travel or work related trips, because of this horrendous experience.

Pros: Price was good. If it'd been an expensive ticket I'd have been upset

Cons: Pay for carry on luggage, last board plane despite having a window so everyone had to get up to let me in, no check in 24 hours in advance unless paying for baggage, in flight entertainment didn't work, seat charging outlet didn't work.

Pros: Nothing

Cons: Couldn't even get me a slightly better seat given all the hassles I'd been put thru up to that point.

Pros: Crew was fine, nothing spectacular.

Cons: Paid extra for exit row on A321 - scam for AA to charge extra for this row, there is no extra leg room

Pros: I received the survey for this flight before we even boarded lol. People’s online boarding passes had expired. Noted that it was “due to weather” weather is totally clear, haven’t seen a flake of snow, it’s just cold.

Pros: Seating was comfortable. Purser spoke clear

Cons: Poorly organized boarding in Cancun

Cons: Never made it

Cons: Please reduce your delays - again we took off with more than an hour delay and by definition you are responsible of that disagreement, you are the company I am paying for the service....

Cons: Leg room was lacking.

Pros: Food were bad. Out of air condition

Cons: More room.

Pros: Flight was shorter than expected

Pros: Left in time

Cons: The plane was so unbelievably hot. The air hardly blew out of the vents. Also, they left the lights on the entire time on a flight that left at 10pm and arrived at 12:30pm (11:30pm local time). It made for a very uncomfortable ride

Cons: Power outlets worn out and won't hold a plug so they are unusable

Cons: Seat space was very tight

Pros: The stuff were accommodating and fun

Cons: I was traveling with two kids and they used my phone for shows and I brought another older Oppo phone for the myself. It just wouldn't work with the united app to open up the movies. Was unfortunate because I had two flights.

Cons: flight was 90 mins late.

Pros: Food was great

Cons: When I bought the tickets, I didn't realize a carry on luggage is and extra $45. That's $90 added to the ticket price. Buyer beware

Cons: Plane was 2 hours late, no advance notice of the delay, and was on the hangar the entire time. No accommodations for delay and.

Pros: The crew was friendly.

Cons: There were no complimentary beverages including water. The seats do not recline at all.

Cons: Website would not let me check in the day before or the morning or my flight. There was an error every time and I almost got to the end once. I could not change the time of my transportation and arrived 10 minutes past the check in deadline (an hour prior to the flight taking off). I was refused access to the flight and offered a flight 5 hours later. The staff was rude and not helpful. I had heard negative things about Frontier and now I know why.

Pros: That eventually I made it to SFO. Also too that the jerk sitting in front of me was corrected by a fellow traveler. All through the flight the guy kept egging for a fight with someone but thankfully disappointed.

Cons: When my ticket was originally resevered I printed out the flight info than. I was to go out Alaska and come back on Frontier. On the day of my flight I checked my email and was confused because it showed Frontier instead and if I checked in online I had to pay 15.00 more dollars to pick a seat. This is at 4:00a.m. in the morning and my visa is downstairs. I'm not paying another 15 for a seat I should already have. When I get to airport, I'm told not Alaska but Virgin. I run to Virgin only to find it's Frontier and instead of 7:15 the flight leaves at 7:00 and I had to wait in line to get this info because kiosk wouldn't let me log on. Needless to say I had to book the next flight that came 8 hours later. Why so few flights to SFO and if all three of you are connected why couldn't the rep. book me on one of the other two? I was responsible to get there 2 hours ahead but I could have made it if the paperwork had not been so confusing.

Cons: When I bought the tickets, I didn't realize a carry on luggage is and extra $45. That's $90 added to the ticket price. Buyer beware

Pros: Friendly flight attendants; apparently a diverse or progressive hiring policy

Cons: Seat couldn't be reclined which is below standard; checked-in baggage too expensive ($40 - that's not a fair price, it should have been no more than $25 as with competitors, ideally $0 to $20); was not able to use cash to pay for baggage at the counter; the need to pay for snacks and drinks on board (at least a cup of juice, tea or coffee should be offered as I see it but this is not a make-or-break point).

Pros: Minimal service, seats didn't recline, tiny tray tables.

Cons: No food no entertainment. It's a sad change from how United used to be

Pros: After a 2 hour delay we boarded to free DirectTV. Thanks United!

Cons: Gate agent, grumpy. Some how she thought it was my fault they offered me a cheap ticket to purchase. Regardless of the price I, or anyone else pays, we should all be treated equally with dignity and professionalism.

Cons: flight was 90 mins late.

Pros: Cool crew

Cons: Delayed flight

Pros: Price

Cons: Seating is tight

Pros: Not to much

Cons: Was like riding a city bus. Even in row one didn't have much room to stretch out. Check in took awhile. Only thing they had going for them was good pilots and staff. But the planes are trash no entertainment, little selection of food and drinks. Don't suggest at all.

Cons: We missed this flight because our earlier flight was delayed and all frontier would do is tell us that we could “google” flights on other airlines to get us where we needed to go. No hotel voucher for the forced overnight, no refund for the missed leg, nothing. I really don’t understand how this company is in business.

Cons: if flight was delayed should at least provide complementary soft drinks...

Cons: Seats in economy were cramped! Chair barely leaned back at all. Woke up with a sore neck. Cabin was freezing!

Cons: United king of being delayed..

Cons: United have somehow managed to make their newer planes (777) even less comfortable then their old ones, I thought that was impossible but they found a way.

Pros: Nice Hosts?

Cons: Cant watch TV for free- stuck watching gold rush whatever that is. Seats were uncomfortable knees felt cramped up smelled funny could not sleep, because the seats were not comfortable we sat at the gate for too long we took off late why didnt we de-ice beforehand? I dont understand why they say "we need to check your bags" when there is plenty of overhead space. It's stupid

Pros: Not to much

Cons: Was like riding a city bus. Even in row one didn't have much room to stretch out. Check in took awhile. Only thing they had going for them was good pilots and staff. But the planes are trash no entertainment, little selection of food and drinks. Don't suggest at all.

Pros: Nothing.

Cons: After building in additional fees paid for seats didn't really cost less than competing airlines. No reclining seats. First airline where you had to pay for everything including soda.

Cons: Too many hiccups on Frontier website. Hidden fees and/or charges for everything. Delayed flights. Unfriendly team.

Pros: Good

Cons: Good

Pros: Nothing

Cons: Couldn't even get me a slightly better seat given all the hassles I'd been put thru up to that point.

Cons: Worst landing ever .

Cons: Entertainment system was extremely poor. Need app to use it so I didn't preload onto my iPad but tried to use iPhone instead and the streaming was just so poor and kept freezing that I just gave up and read a book. Also selection should have included a lot more shorter programs that could be viewed on less than 2 hour flight eg lifestyle programs, news etc.

Cons: flight was 90 mins late.

Pros: Good

Cons: Good

Pros: The crew were great and considerate knowing a large portion of the passengers had just had a horrible flight from Atlanta.

Cons: Can't fault anything but the lack of healthy and/or meal options on the menu

Pros: Nice flight with competent crew.

Cons: Kiosks did not work for check-in so I had to queue up and wait for help. Then I got charged $45 for a carry-on. Not a great start to the day.

Pros: Wonderful service

Pros: The crew and the fact that they at least acted like they cared.

Cons: After UA posted a four hour delay for my original flight, I switched to the next available 1.5 hours later. That flight got delayed and then delayed some more, and by the time I got to SFO, the flight I originally booked, landed about 20 minutes later.

Cons: I was charged twice for my ticket

Pros: The flight attendant was really nice

Cons: Way too much money for the quality of first glass - I should have never upgraded, ancient.

Cons: Power outlets worn out and won't hold a plug so they are unusable

Pros: They did get to reschedule me on both my flights, but lost my bag.

Cons: Great early morning flight.

Pros: Getting offered a stipend to change flights - getting my preferred rental car

Cons: A direct flight

Cons: Leg room was lacking.

Pros: Nice seats, very helpful staff at ticketing and nice crew

Cons: Reservation was deleted so check in took a very long time and my seat (reserved weeks in advance) on the long international flight was reassigned to a very undesirable location.

Cons: Boarding group is getting huge!!!

Pros: Boarding was easy and organized.

Cons: Older plain with less leg room. Had to pay to watch a movie. Little bag a snack are little!

Pros: Food was great

Pros: My flight was missed due to immigration taking almost 3 hours to get through the line. Delta went out of their way to make sure that I was able to get to my destination on a later flight as comfortable as possible.

Cons: Maybe not traveling through Atlanta if there is immigration clearance involved. I was really slow.

Pros: Very friendly cabin crew; excellent service with a smile. Food was good considering, and Magnum ice cream bar a delightful treat. Cabin crew paid good attention to benefits of hydration and served water continuously. Seats and leg room were comfortable considering economy and no extra cost.

Cons: Plane was not as clean as it should be--plastic utensil on floor, seat rails not vacuumed--however, still rate overall comfort as excellent.

Cons: Flight was delayed more than 4 hours. I switched flights to try to beat the 4 hour delay but was still delayed 4 hours. After verifying with delta t am members that my bags had been rechecked they had not

Pros: Zee was our flight attendant and she was absolutely wonderful. Personable, attentive, and she made sure each and every person on the plane was comfortable and happy, going so far as to move solo passengers to empty rows so they could have more space. I wish she could be on every flight I take.

Cons: Flight was 65 mins delayed due to mechanical issues. Updates came from flight attendants insisting gate agents update the flight status.

Pros: The employees were very helpful on both legs of the journey and the conneting flights were conveniently located in the same area. Pilot was good about letting us know time frame of mechanical issue repair while on tarmack.

Cons: The seats were incredibly uncomfortable. Must be the type of plane because never really had issues on other flights. We noticed many carry on bags others brought on bosrd were oversized. On leg from Kalispell to Denver the crew were diligent in spotting larger bags and tagging them for under plane storage for the flight. From Den to SFO however not so much. This led to most bins being filled ahead of our group 4 boarding with larger than permitted carry on bags. Obviously larger! Luckily we were able to put our smaller bags (which we made sure fit to overhead storage specs ahead of time) under the seat for flight but that made an uncomfortable 2.5 hour journey. Actually over 3 hrs because there was a mechanical problem which had us sitting on the tarmack for over 30 minutes from Den to SFO. We've flown United before without much incident but this trip in particular was pretty crappy.

Cons: The delayed flights and neck pillows.

Cons: No on board entertainment unless you had your own device, which I didn't.

Pros: Our seats were assigned at the gate. Somehow we were given the comfort + seats. Very nice! Thank you!

Cons: More room.

Cons: Quick 30 minute flight

Pros: Crew was amazing and friendly. Flight was on time.

Cons: Na