United Polaris offers lie-flat seats with aisle access, ideal for long-haul comfort.
United Polaris Lounges provide a luxurious experience with restaurants and less crowding.

Planning a trip from San Francisco to London? 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.
When planning a trip from San Francisco to London, it's important to consider a few factors to get the best deal. Generally, Tuesday is the cheapest day of the week to fly, while October is the cheapest month.
Route Choice: Opt for flights from San Francisco to London Gatwick for the cheapest fares.
Booking Time: Book your flight around 14 days in advance to get the best price.
Airline Selection: WestJet generally offers the cheapest flights for this route.
Flight Type: Choosing a flight with one stop can save you money compared to direct flights.
AI-powered; AI can make mistakes.
| Low season | January |
|---|---|
| High season | July |
| Cheapest flight | $375 |
Direct departures
San Francisco to London
Monday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Tuesday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Wednesday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Thursday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Friday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Saturday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Sunday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Direct returns
London to San Francisco
Monday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Tuesday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Wednesday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Thursday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Friday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Saturday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
Sunday
British Airways, United Airlines, Virgin Atlantic
British Airways, United Airlines, +1 more
The flight was delayed for about 2 hrs. Other than it, it was good.
The flight was delayed for about 2 hrs. Other than it, it was good.
I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again
No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.
Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer
Plenty of leg room, temperature was great and staff was excellent. Would do it more often.
Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.
The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.
Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.
Passengers need to check in big baggage instead of bringing on the plane. That cause inconvenience for everyone. Otherwise flight was good.
Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.
Food has been disappointing in both legs of flight to india
Great staff great experience, made a 2 hour delay very bearable
Great staff, great experience, made a 2 hour delay very bearable
Food was the worst I’ve had on a VA flight. Normally it’s a lot better
I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼
These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.
Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.
The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great
Great crew - old style upper class seats on the older fleet now feels dated
Premium economy more comfortable than economy, but not by much. Did was awful, do not try the omelette. Flight crew were helpful. Flight was delayed by over an hour. Overall but bad, arrived safely and thank God.
left on time, reasonable boarding process arrived early luggage came out quickly
Some flight attendants were great others were cranky. Seats were very tight and sitting on an aisle was very hard as the carts and people walking constantly bumped shoulder and arm.
Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.
United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent
from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.
This was an older airplane. The cabin was constantly warm to hot throughout the 10 hour flight and there were no vents to personalize air flow. Also since it was an older plane, the material and comfort of the chairs were very uncomfortable. I left my flight with major soreness on my tailbone.
Older aircraft, no meal, only food was for purchase. Not impressed United.
Not pleasant trip cross country when the entertainment and WiFi system not working. No entertainment for entirety of route. Staff was rather nonchalant in that they dismissed the problem due to age of plane. It would have been nice to know this up front so I could have come prepared to read or download movies before boarding Coincidentally or not, there was a similar issue with the entertainment system on my previous flight I took on my fist leg of the trip. There are no seat TVs, so you must rely on the app when it works. United can do better. Also, what use it it to pay for boarding group 2 when half of the passengers are in the same line as you?
My experience on this United Airlines flight was highly uncomfortable, primarily due to two issues: Cabin Temperature: The temperature on the Boeing 737 MAX 8 was unacceptably high, feeling consistently around 80 degrees throughout the flight. This made sleeping impossible and significantly detracted from the experience. Seating Arrangement: Being stuck in a middle seat for a six-and-a-half-hour overnight flight compounded the discomfort. Moving forward, I will always purchase a seat assignment to avoid this situation.
Premium Plus is a really good idea for longer flights
The boarding procedure got confusing because they wanted to weigh everyone’s carry-on. Apparently mine was 3 1/2 kg over their limit. I didn’t know they had a limit. And at the check-in desk, nothing was said about this. They wanted me to check the carry-on at no charge and that would have been fine except then they told me at my connection in London I would have to go outside to baggage claim retrieve my bag, and then recheck it. In other words, they could not check it to my final destination, only to London. I told him this was unacceptable so after a few minutes of discussion, they came back and said that my bag would be OK to carry on the plane. It seems that if you have a connection then the weight is not as important. Then when I actually went to board the boarding agent said I needed a tag indicating that my bag had been weighed, even though she had just five minutes ago talked to the same person who cleared me. Lots of confusion seems like a very bad process. They need to improve this.
My flight being automatically moved messed up my travel plans, and I had to quickly find an alternative mode of transportation. I couldn’t get a refund from any of the companies involved. Kayak, Ibiza, or Vueling. I am still unsure of how to settle my concern.
Plane delayed due to weather. Plane boarded, then told to unboard due to a maintenance issue.
the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.
Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.
The staff was very nice and helpful. Some of the best crew I have met.
Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268
Was all good.l including a sofdrink. AA improved significantly. There was no entertainment.
I've taken British Airways before and it has been great. On this trip to Spain and Portugal we had two BA flights. On both flights we were taken by bus from the terminal out to the plane on the tarmac. There were many older folks on these flights, and to ask people in their 70s to lug their carry-on and personal items up the long mobile staircase to the plane entrance, is very disturbing. I won't be taking British Airways in the future. Many people on these flights were very unhappy.
The food on the flight was of marginal quality. Small bits of chicken, instant mashed potatoes and some carrots. The rolls were very dry, nearly inedible. The seats were quite small and didn’t allow for any shifting of position during the flight. There was limited leg room.0
Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices
The airline was not clear about a new departure time so we got to the airport early anyway. The flight left early which was great because of weather. The check in process was very easy and staff were friendly and helpful. The crew was great and our flight was very good.
Awful it always is unfortunately is the only way to fly direct to london
I travelled in business class and was disappointed by lack of service, curt and borderline rude time of the crew and to top it off, all of my luggage was delayed. It was like pulling teeth to even report the missing luggage and recover it the next day from the airport.
Boarding was poor. All groups called immediately one after the other resulting in a long queue in the jetty/jet bridge. Seats were very hard and and did not recline on a 4.5 hour flight. No food was available. Plane was cold. There was no entertainment.
The cramped seats are cruel and unusual punishment and may violate the Geneva code.
Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre
The flight was excellent in World Travellor plus. Well worth the extra money. Boarding at Phoenix was the usual poorly organized event. Very stressful.
Although business class, the seating was really cramped. The food was so so.
Smooth trip no turbulence which is always a bonus for me lol! In cattle class so an element of being a bit squished (but not as bad as other shorter haul airlines) smaller plane than the one we flew out on and entertainment system wasn’t as modern but still definitely passed the time. Lovely crew x