San Francisco → London flights
SFO–LHR fares median at $307 across 30 daily snapshots; staying patient for bottom-quartile pricing below $286 can meaningfully cut your transatlantic cost.
Target $286–$307 on SFO–LHR — spread signals real savings exist
Key takeaways
- Median fare is $307 across 30 daily snapshots — a reasonable baseline for budgeting this route.
- Bottom 25% of fares came in at $286 or less — achievable with flexibility, though not guaranteed.
- The low recorded was $269, suggesting sub-$270 deals do surface, but the high hit $432 — a 61% spread that rewards active monitoring.
- The interquartile range ($286–$340) is the realistic target zone: most shoppers who booked during favorable windows landed here.
- No dominant carrier was identifiable from this data, so comparing across airlines rather than defaulting to one is advisable.
30-day price trend
See full numbers and stats on the SFO → LHR price history page.
The full picture
San Francisco to London Heathrow is one of the most competitive transatlantic corridors, and the 30-day fare snapshot bears that out. The median cheapest daily fare landed at $307, with the middle half of observations clustering between $286 and $340. That $54 interquartile range is relatively tight in absolute terms, but the full spread — from a low of $269 to a high of $432 — is 61%, which is wide enough to make timing genuinely consequential. Put plainly: catching this route on a bad day costs you over $125 more than catching it on a good one.
For booking strategy, a 61% spread across 30 snapshots suggests fare volatility that tends to correlate with demand surges rather than a smooth downward glide as departure approaches. The practical implication is that waiting for the absolute floor ($269 range) is risky — you're more likely to land in the $286–$307 zone if you set a fare alert and pull the trigger when prices dip to or below the p25 threshold of $286. There is no data here pointing to a specific advance-purchase sweet spot in weeks, but the general principle on long-haul transatlantic routes is that fares in the three-to-six-month window before departure tend to be more stable than last-minute inventory.
No single dominant carrier emerged from this dataset, which is consistent with a route served by multiple competing airlines. That competition is likely a structural reason the median stays as low as $307 on a ~5,500-mile flight. Rather than assuming loyalty to one carrier will yield the best price, cross-shopping across all operators on this route is the more data-consistent approach. One honest caveat: 30 snapshots capture a single rolling window and may not reflect seasonal peaks — summer and holiday-adjacent departures on SFO–LHR historically command premiums not visible in every snapshot period.
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AI-authored from this route's 30-day price index. Article last regenerated Jun 20, 2026. Fares shift continuously — confirm at booking.