Award space from SFO to Tokyo Narita is currently available on April 23, 2026, with plenty of seats showing at the saver level. At 55,000 miles one-way, this is running about 8% below the typical 60,000-mile rate you'll often see for transpacific economy awards through United.
While this isn't a blockbuster discount, it's a reliable option for families planning spring travel to Japan. The minimal $6 tax bill is a nice bonus—United's own metal tends to carry very low fees compared to partner awards.
Cherry blossom season in Tokyo typically peaks in late March to early April, so late April puts you just past the main crowds while still enjoying pleasant spring weather. It's a reasonable time to visit with kids before the summer humidity sets in.
A practical note: if you're booking for a family, search for one passenger first to confirm availability, then call United to book multiple seats together if the online system gives you trouble with larger groups.
How to book
Search and book directly through United's award search tool: https://www.united.com/en/us/book-flight/united-awards/search