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Book cheap flights from North America to San Francisco (round-trip)

Airports
Origin
Denver
$69
only
$69
Destination
San Francisco
$69
only
$69
Wed, Dec 20
DEN
SFO
2h 49m
Wed, Jan 3
SFO
DEN
2h 25m
Trip: 15 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 157 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SFO
Good 6.6

Boarding was easy and organized.

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

DEN
SFO
Excellent 9.6

The FC Cabin is very comfortable; The service was also excellent

The food was mediocre

DEN
SFO
Good 6.3

It was a brand new aircraft in it was a big one.

DEN
SFO
Mediocre 2.3

Nice Hosts?

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

DEN
SFO
Mediocre 2.0

Nothing

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.

Thu, Mar 1
DEN
SFO
2h 45m
Tue, Mar 6
SFO
DEN
2h 42m
Trip: 6 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Dec 16
DEN
SFO
2h 47m
Sun, Dec 31
SFO
DEN
2h 34m
Trip: 16 days
4.5OkayShow reviews
Overall 4.5 Okay
Based on 578 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SFO
Good 6.0

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

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

DEN
SFO
Excellent 9.6

I arrived safely

DEN
SFO
Mediocre 2.0

Nothing

Everything

DEN
SFO
Good 7.0

I did not like the lack of space.

DEN
SFO
Mediocre 2.0

I didn’t like anything about it.

I almost missed my flight because you oversold . Your agent at the gate wasn’t friendly at all. I had to call the customer service so I get my seat.

Thu, Dec 21
DEN
SFO
2h 46m
Tue, Jan 30
SFO
DEN
2h 36m
Trip: 41 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 157 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SFO
Okay 4.4

Chief flight attendant was nice and attentive.

Our section of the plane was very warm. When we mentioned it to one of the attendants, she pointed to the overhead vents and told us to use them. (We already knew this and had them open all the way!) Then the chief flight attendant came by and she was VERY responsive and went to tell the pilots. It got a little better but still stayed on the warm side the rest of the way. Your boarding process makes no sense and does nothing to get passengers settled faster. After priority seating is done, let the people in the BACK of the plane board first, then the middle section passengers, then the Eco Plus passengers.

DEN
SFO
Good 6.3

I like that this flight got me from point A to point B. It was uneventful.

I am tall and there is never enough leg room

DEN
SFO
Excellent 9.6

The FC Cabin is very comfortable; The service was also excellent

The food was mediocre

DEN
SFO
Good 6.3

There was a mechanical delay that caused us to leave 1.5hr late. The gate team did a good job keeping us informed of what was going on.

Delay kept changing as they tried to fix the problems. Also, wifi did not work so I couldn't use free United entertainment via the app.

DEN
SFO
Good 7.3

Nice seats, very helpful staff at ticketing and nice crew

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.

Sat, Dec 23
DEN
SFO
2h 47m
Sat, Jan 6
SFO
DEN
2h 25m
Trip: 15 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 157 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SFO
Mediocre 2.0

Nothing

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.

DEN
SFO
Mediocre 2.0

I was charged twice for my ticket

DEN
SFO
Excellent 8.3

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

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.

DEN
SFO
Good 7.3

Nice seats, very helpful staff at ticketing and nice crew

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.

DEN
SFO
Okay 5.0

Friendly crew

Sardine can with no amenities. What value.

Sun, Dec 17
DEN
SFO
2h 47m
Sat, Dec 30
SFO
DEN
2h 39m
Trip: 14 days
4.5OkayShow reviews
Overall 4.5 Okay
Based on 578 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SFO
Good 7.0

I did not like the lack of space.

DEN
SFO
Mediocre 2.0

Nothing

Everything

DEN
SFO
Mediocre 2.0

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.

DEN
SFO
Okay 4.0

Connecting flight was delayed by one hour!!!!!

DEN
SFO
Good 6.0

Nice flight with competent crew.

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.

Wed, Feb 21
DEN
SFO
2h 46m
Wed, Feb 28
SFO
DEN
2h 45m
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Jan 9
DEN
SFO
2h 49m
Wed, Jan 17
SFO
DEN
2h 25m
Trip: 9 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 157 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SFO
Good 7.3

Nice seats, very helpful staff at ticketing and nice crew

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.

DEN
SFO
Mediocre 2.3

Nice Hosts?

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

DEN
SFO
Good 6.3

I like that this flight got me from point A to point B. It was uneventful.

I am tall and there is never enough leg room

DEN
SFO
Excellent 8.3

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

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.

DEN
SFO
Good 6.3

There was a mechanical delay that caused us to leave 1.5hr late. The gate team did a good job keeping us informed of what was going on.

Delay kept changing as they tried to fix the problems. Also, wifi did not work so I couldn't use free United entertainment via the app.

Mon, Dec 18
DEN
SFO
2h 47m
Sun, Dec 31
SFO
DEN
2h 34m
Trip: 14 days
4.5OkayShow reviews
Overall 4.5 Okay
Based on 578 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SFO
Okay 4.0

Connecting flight was delayed by one hour!!!!!

DEN
SFO
Good 7.0

I did not like the lack of space.

DEN
SFO
Okay 5.0

Everything was ok. Not great and not aweful.

The seating was very crammed. Seats were too small.

DEN
SFO
Excellent 9.6

I arrived safely

DEN
SFO
Mediocre 2.0

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.

Thu, Feb 22
DEN
SFO
2h 54m
Wed, Feb 28
SFO
DEN
2h 35m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Wed, Jan 10
DEN
SFO
2h 46m
Wed, Jan 17
SFO
DEN
2h 35m
Trip: 8 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 157 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SFO
Excellent 9.6

The FC Cabin is very comfortable; The service was also excellent

The food was mediocre

DEN
SFO
Excellent 8.3

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

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.

DEN
SFO
Good 6.3

I like that this flight got me from point A to point B. It was uneventful.

I am tall and there is never enough leg room

DEN
SFO
Mediocre 2.0

I was charged twice for my ticket

DEN
SFO
Good 6.6

Boarding was easy and organized.

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

Tue, Dec 19
DEN
SFO
2h 54m
Sun, Dec 31
SFO
DEN
2h 34m
Trip: 13 days
4.5OkayShow reviews
Overall 4.5 Okay
Based on 578 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SFO
Good 7.0

I did not like the lack of space.

DEN
SFO
Good 6.0

Nice flight with competent crew.

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.

DEN
SFO
Mediocre 2.0

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.

DEN
SFO
Good 6.0

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

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

DEN
SFO
Excellent 9.6

I arrived safely

Sat, Feb 24
DEN
SFO
2h 52m
Wed, Feb 28
SFO
DEN
2h 24m
Trip: 5 days
Overall 0.0 Poor
Based on 0 reviews
Thu, Jan 11
DEN
SFO
2h 47m
Mon, Jan 15
SFO
DEN
2h 33m
Trip: 5 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 157 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SFO
Good 6.6

Boarding was easy and organized.

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

DEN
SFO
Okay 5.0

Friendly crew

Sardine can with no amenities. What value.

DEN
SFO
Mediocre 2.0

I was charged twice for my ticket

DEN
SFO
Good 6.3

It was a brand new aircraft in it was a big one.

DEN
SFO
Mediocre 2.0

Nothing

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.

Wed, Dec 20
DEN
SFO
3h 01m
Tue, Jan 16
SFO
DEN
2h 34m
Trip: 28 days
4.5OkayShow reviews
Overall 4.5 Okay
Based on 578 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SFO
Okay 4.0

Connecting flight was delayed by one hour!!!!!

DEN
SFO
Good 6.0

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

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

DEN
SFO
Good 6.0

The flight was delayed an hour and the website would never work on my phone to check in and pay for our baggage.

DEN
SFO
Mediocre 2.0

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.

DEN
SFO
Good 7.0

I did not like the lack of space.

Thu, Mar 1
DEN
SFO
2h 45m
Wed, Mar 7
SFO
DEN
2h 41m
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Sat, Jan 13
DEN
SFO
2h 51m
Tue, Jan 23
SFO
DEN
2h 36m
Trip: 11 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 157 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SFO
Good 6.3

It was a brand new aircraft in it was a big one.

DEN
SFO
Good 6.3

There was a mechanical delay that caused us to leave 1.5hr late. The gate team did a good job keeping us informed of what was going on.

Delay kept changing as they tried to fix the problems. Also, wifi did not work so I couldn't use free United entertainment via the app.

DEN
SFO
Excellent 9.6

The FC Cabin is very comfortable; The service was also excellent

The food was mediocre

DEN
SFO
Okay 4.4

Chief flight attendant was nice and attentive.

Our section of the plane was very warm. When we mentioned it to one of the attendants, she pointed to the overhead vents and told us to use them. (We already knew this and had them open all the way!) Then the chief flight attendant came by and she was VERY responsive and went to tell the pilots. It got a little better but still stayed on the warm side the rest of the way. Your boarding process makes no sense and does nothing to get passengers settled faster. After priority seating is done, let the people in the BACK of the plane board first, then the middle section passengers, then the Eco Plus passengers.

DEN
SFO
Good 6.3

I like that this flight got me from point A to point B. It was uneventful.

I am tall and there is never enough leg room

Thu, Dec 21
DEN
SFO
2h 54m
Fri, Dec 29
SFO
DEN
2h 45m
Trip: 9 days
4.5OkayShow reviews
Overall 4.5 Okay
Based on 578 reviews
Overall
5.9
Boarding
6.4
Comfort
5.4
Crew
6.8
Entertainment
4.5
Food
4.7
DEN
SFO
Good 6.0

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

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

DEN
SFO
Excellent 9.6

I arrived safely

DEN
SFO
Good 6.0

Fairly inexpensiveI

I did not like the fact that I was charged $45 for a carry on piece of luggage both ways. It added $90 to the cost of my trip.

DEN
SFO
Good 6.0

The flight was delayed an hour and the website would never work on my phone to check in and pay for our baggage.

DEN
SFO
Okay 4.0

Connecting flight was delayed by one hour!!!!!

Sat, Dec 23
DEN
SFO
2h 48m
Mon, Jan 1
SFO
DEN
2h 45m
Trip: 10 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Jan 16
DEN
SFO
2h 49m
Tue, Jan 23
SFO
DEN
2h 36m
Trip: 8 days
6.7GoodShow reviews
Overall 6.7 Good
Based on 157 reviews
Overall
7.2
Boarding
7.4
Comfort
6.9
Crew
7.7
Entertainment
6.5
Food
6.4
DEN
SFO
Excellent 8.3

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

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.

DEN
SFO
Good 7.3

Nice seats, very helpful staff at ticketing and nice crew

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.

DEN
SFO
Good 6.6

Boarding was easy and organized.

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

DEN
SFO
Mediocre 2.3

Nice Hosts?

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

DEN
SFO
Okay 4.4

Chief flight attendant was nice and attentive.

Our section of the plane was very warm. When we mentioned it to one of the attendants, she pointed to the overhead vents and told us to use them. (We already knew this and had them open all the way!) Then the chief flight attendant came by and she was VERY responsive and went to tell the pilots. It got a little better but still stayed on the warm side the rest of the way. Your boarding process makes no sense and does nothing to get passengers settled faster. After priority seating is done, let the people in the BACK of the plane board first, then the middle section passengers, then the Eco Plus passengers.

*
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