San Francisco → London flights

SFO–LHR: Target $355 but watch for spikes to $485

Key takeaways

• Median fare is $355, and the 25th percentile is also $355 — meaning half of observed prices clustered right at that floor.
• Top quartile starts at $440, so fares can run $85–$130 above the median before reaching the $485 ceiling seen in the data.
• 37% price spread between low and high signals meaningful volatility — this is a route where timing your purchase matters.
• Sample is 17 days of snapshots, which is a moderate but not large dataset; treat these figures as directional, not definitive.
• No dominant carrier is identifiable from this data, so comparison-shop across airlines rather than defaulting to one.

30-day price trend

See full numbers and stats on the SFO → LHR price history page.

The full picture

The SFO–LHR price range tells a fairly clear story: the floor is firm at $354–$355, and a large share of observed fares land right there. The tight clustering between the median ($355) and the 25th percentile ($355) suggests that when cheap seats are available on this route, they tend to be available near that specific price point — there isn't a wide band of 'somewhat cheap' fares below the median. If you see $355, that's a credible signal you're near the bottom of what this route typically offers.

The upper end is where things get expensive quickly. The 75th percentile jumps to $440, and the observed high hits $485 — a 37% spread from floor to ceiling. That kind of range on a transatlantic route usually reflects a mix of factors: how far in advance you're searching, whether sale inventory has already been picked over, and broader demand fluctuations across seasons. On a long-haul route like this, fares generally soften when booked roughly 6–10 weeks out for off-peak travel, though they can compress again in the final two weeks as remaining inventory gets priced higher. There's no day-of-week booking pattern visible in this dataset, and claiming one would go beyond what the data supports.

One honest caveat: 17 daily snapshots is a workable sample but not a large one. These figures represent a specific 30-day window of cached fares and may not capture seasonal swings — fares to London from San Francisco can behave very differently in summer versus late autumn. Use the $355 benchmark as a reference point, not a guarantee, and set a fare alert so you can act when that price appears rather than waiting to time a perfect booking moment.

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