San Francisco to Tokyo Narita in Economy

No sweet spot in our database is currently tagged specifically to Asia economy on this route, which means the math starts with a search, not a transfer. Before moving a single point, you need confirmed award availability on a flight you'd actually want to take — because transferring speculatively to an airline program is a one-way door with no refund if space disappears.

For SFO–NRT in economy, the two alliance ecosystems worth searching first are Star Alliance and oneworld. On the Star Alliance side, Air Canada Aeroplan is the strongest starting point: it prices transpacific economy using a distance-based chart and partners directly with United, ANA, and other Star carriers operating this route. ANA Mileage Club is worth checking as well, particularly for ANA-operated metal, though it requires transferring to ANA's own program. On the oneworld side, Alaska Mileage Plan and British Airways Executive Club (Avios) can both book Japan Airlines flights between SFO and NRT, with Avios pricing based on distance zones and Alaska using a fixed partner chart. See our program pages for current chart details on each.

Economy saver space between San Francisco and Tokyo is meaningfully more accessible than premium cabins, but "more accessible" is not the same as "readily available." Shoulder-season travel — think late January through mid-March, or October into early November — tends to show more open dates. Peak summer (June–August) and the Golden Week window (late April to early May) are genuinely constrained, as are the major holiday clusters around Thanksgiving and New Year. ANA and JAL both release some saver inventory close to departure when seats go unsold, but counting on that is a strategy, not a plan. Search a flexible date range, ideally 3–4 weeks wide, before you commit to any transfer.

The most practical transfer paths into the programs above run through the major bank currencies. Chase Ultimate Rewards transfers to Aeroplan at 1:1 and to British Airways Avios at 1:1. American Express Membership Rewards transfers to Aeroplan at 1:1 and to ANA Mileage Club at 1:1. Capital One Miles transfer to Avianca LifeMiles at 1:1 — LifeMiles is a Star Alliance program that can price ANA and United flights on this route and sometimes offers promotional discounts that improve the cents-per-point math. Always verify that the transfer ratio and partner list haven't changed before initiating; program terms update without notice and our program pages reflect the most recent confirmed ratios.

The CPP calculation is where expectations often need recalibrating. If an economy saver on this route costs, say, 35,000 Aeroplan points and the equivalent paid fare is around $700, the redemption comes in near 2.0¢ per point — which aligns squarely with our 2.0¢ conservative valuation for Chase Ultimate Rewards (the source currency for most Aeroplan transfers). That's a solid redemption: you're not leaving value on the table, but you're also not unlocking outsized leverage the way a business-class saver sometimes can. If the saver rate is unavailable and the next available award prices at 55,000–70,000 points for what amounts to a $700–$800 fare, the CPP drops well below our valuation floor and cash or a travel card becomes the better play. Run the numbers against our valuation tables before pulling the trigger, and don't let the appeal of "spending points" override the arithmetic.

Find space first — then transfer.