Despite the prices, there are plenty of seats to/from both destinations all the way through June. Expect good deals starting in mid-May on Frontier Airlines, too.
USAirways is offering a great fare of $378 roundtrip between Anchorage and San Diego, starting in early January. Be careful as you're picking your connections, though. Some of the published fares include v-e-r-y long layovers in Phoenix.
The above air fare deals are in addition to Anchorage-Las Vegas ($396 roundtrip on Alaska Airlines) and Anchorage-Phoenix ($416 roundtrip on Alaska Airlines) that we discussed earlier this week.
Many destinations go on sale starting in mid-May, including Anchorage-Seattle ($242 roundtrip on JetBlue), Anchorage-Los Angeles ($296 roundtrip nonstop on Alaska Airlines), Anchorage-Long Beach ($296 roundtrip nonstop on JetBlue), Fairbanks-Denver ($347 roundtrip nonstop on Frontier Airlines) and Anchorage-Reykjavik, Iceland ($752 roundtrip nonstop on Icelandair).
Of course, all air fares (particularly the über-cheap fares to/from San Francisco and Denver) are subject to change without notice.