United Polaris offers lie-flat seats with aisle access, enhancing comfort on long-haul flights.
United Polaris Lounges provide a luxurious experience with restaurants and less crowding.
Planning a trip from Heathrow to San Francisco? 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 | $324 |
Direct departures
London Heathrow to San Francisco
Monday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Tuesday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Wednesday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Thursday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Friday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Saturday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Sunday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Direct returns
San Francisco to London Heathrow
Monday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Tuesday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Wednesday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Thursday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Friday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Saturday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
Sunday
Aer Lingus, Aeromexico, Air Canada, +15 more
Aer Lingus, Aeromexico, +16 more
14
15
My flight was extremely cold. I had a jacket and a cover was left in each seat. The cover was extremely thin and I have a disability, fibromyalgia and arthrithis and AC air is the worst. I closed my vent and my husbands vent and it still was frigid. I asked the attendant if I could get another cover and she quickly almost dismissively and totally unconcerned stating, (I quote) (one per chair) and walked off so quickly that I didn't get a chance to explain to her that I literally have adisability. I didnt want to make a seen so I set on that flight for over 5 hours in pain, joints locking up and extremely uncomfortable. When my fibromyalgia flares up my joints not only ache but they will lock up also and it takes me days to get back to my regular self even though I take medication for it. I felt like it would not have hurt anyone at all for her to just give me an extra cover because I'm sure they have all types of medical issues in people that fly every day.
My flight was extremely cold. I had a jacket and a cover was left in each seat. The cover was extremely thin and I have a disability, fibromyalgia and arthrithis and AC air is the worst. I closed my vent and my husbands vent and it still was frigid. I asked the attendant if I could get another cover and she quickly almost dismissively and totally unconcerned stating, (I quote) (one per chair) and walked off so quickly that I didn't get a chance to explain to her that I literally have adisability. I didnt want to make a seen so I set on that flight for over 5 hours in pain, joints locking up and extremely uncomfortable. When my fibromyalgia flares up my joints not only ache but they will lock up also and it takes me days to get back to my regular self even though I take medication for it. I felt like it would not have hurt anyone at all for her to just give me an extra cover because I'm sure they have all types of medical issues in people that fly every day.
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
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.
I love the free WiFi!! Crew was nice. Bathroom was decent. First time flying delta in a long time and I enjoyed it. Will definitely look into booking with Delta more but I think Delta is a little more expensive than the other airlines.
Seats are much much more comfortable than United, which is what I usually fly
Boarded plane and then delayed 1.5 hours while on the plane
It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth
My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.
Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.
Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.
Airbus plane, nice and polite staff, entertainment even as it was a short flight.
United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.
Its good expeince but in enternteiment please be like you tube the music i like or movie
I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.
A bit rush for transit. Food and entertainment are not available
They need to start flying on time. We lost 2 days of our time because they delayed flight both ways.
As always a terrible experience. AA stole a day from my vacation days planned to be spent with my Family. Response: delays related to weather issues.
Even in the premium economy, I found the seats incredibly uncomfortable. I hated that booking through Kayak, it wasn't clear that it was a Level flight, not Iberia. Everything felt cheaply made and not at all worth the airfare we paid.
The flight was over two hours delayed. The aircraft was somewhat dated.
Luggage arrived damaged and protective plastic was lost. I need customer service to contact me or the number for customer service. Thanks.
Provided a good service and I will use it again. Thanks,
Boarding was not well coordinated. I asked twice at the Level check-in area about the MIA flight. At no point did they say the check-in would be at another counter. Fortunately, another passenger was equally confused and got the REAL story from the airport’s info center. Further, my minor child was tagged “SSSS” on their boarding pass. Level should have notified TSA about him being a minor. Instead, the entire family went through the SSSS process, not just our son. When his name was called out at the gate, it was announced in Spanish. No English announcement was made. The food on board was bearable. The crew was adequate, despite not being Level/Iberia crew (Level contracted out our flight to “World2Fly Airlines” - a company I have never heard of!). The onboard entertainment was very limited. They did not even offer a flight tracker option. Nor were music selections offered. Like TAP and Aer Lingus, I will think twice before booking Level ever again.
This ticket was canceled and I did not find out until it was time to check in. I believe the vendor is at fault. Cheap tickets.com I would like to elaborate on the situation to kayak. Can you give me an email address?
You get what you pay for. In general I like the service and flight attendants.
Excellent! Outstanding customer service, the best service I have received. Food was served, dinner, snacks, beverages, crew was there to greet you. 10/10
Never happened. Flight was delayed. Had to be re rojyed
Lufthansa is my favorite airline and have flown oversea with them for the past 25 years: i always found them so professional and incredibly efficient from checking in to arrival. I also love their Munich or Frankfurt airports.
We paid for business class, and my seat did not work at all. Each time I wanted to adjust the position, an attendant had to come to physically force the seat into its new position. They tried to fix it by fiddling with the electronics (military reset, for example), to no avail. Also, the food was just mediocre. We were at the end of a serving section, so they ran out of several choices. (This was on the flight from Los Angeles to Munich.)
The flight was delayed by an hour. Made the connection uncomfortably tight.
The plane was very clean. The bathroom was clean as well. The land crew were very polite and informative and helpful. They informed me that there is a long way and challenging to go from international terminal to national terminal and in addition to getting my suitcases and going through customs and dropping them again for my second leg of trip which was San Francisco to Los Angeles . I have left knee issue and had a recent fall with aching muscles all over, the land crew suggested wheelchair help for me, God bless her. If I did not have help, I could not make it to my last terminal. Thank you UNITED AIRLINE!
I was very happy with everything, thank you for the smooth flight ✈️
helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.
Entertainment system is old. Food can be tastier Need to provide toothbrush and toothpaste at least when asked.
When we went to the lounge they told us to go into the main lounge and not the full business class section, later they told me that Lufthansa wont pay the full fee to alloq the business class passengers entry to the nicer sectikn where all the other airlines nusiness class passengers go into. Very poor arrangement.
Terrible experience. Should be a short simple flight from San Francisco to Palm Springs. Disgusting insult that United Air doesn’t have a cabin crew ready to receive a plane that’s already an hour plus late in departure. Lots of misinformation along the way from cockpit and crew. Definitely unimpressed with both union and management.
3/4 bags delayed and 1/4 damaged at the other end. Flight was freezing
The crew were good. The flight was on time. The entertainment choice was ok. But the food was bad, tasted and texture were awful.
After boarding we were waiting in the plane for more than one hour to take off without AC with very high temperature inside
The flight was an hour late leaving Heathrow. The food was mediocre. When we got to Austin, my husband’s luggage was missing. He filled out information at baggage claim. We are waiting to hear something. His name is Henry Jacob Braunig.
We arrived late to London, and consequently were 5 min. late to be allowed through security for our next flight. Even though dozens of people missed the same flight, BA did not radio ahead to hold open security for an extra 5-10 min. to allow people to get on the flight. This caused an additional 6 hour delay in London after waiting over an hour in Customer Service to get rebooked. They did not have enough staff on hand to help people in a timely manner. Not at all happy with the BA's customer care or customer service.
All service prior to the flight was terrible: online check-in not working, no customer service tel,, multiple airport scanners not working, A huge mess.
CONSTANT ERROR MESSAGE THAT THE WIFI COULD NOT BE PURCHASED DUE TO INABILITY TO CONNECT PAYMENT SYSTEM VIA SATELLITE. THIS HAPPENED IN BOTH DIRECTIONS. THE MAIN REASON I TRAVEL IN PRIORITY IS TO BE ABLE TO WORK FOR WHICH I NEED ACCESS TO INTERNET. .
They lost my luggage. Lady who was helping with it in Austin was rude. Not very helpful!
Waited 3.25 hours in plane only to have the flight cancelled.
More space, of course. a footrest! more room to walk. Movie selection was awful. Some good documentaries would help if the movies can't be better. The flight itself was great, crew was great.
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