Update (12:01 am Friday, June 27, 2008): This offer has either sold out due to huge demand or is no longer available at the originally advertised price, terms and conditions. Click here to see the entire Top 20 list.

Major airlines just announced reduced fares to Phoenix and San Diego starting from just $156 roundtrip.  These special fares are available from cites across the country, but you must hurry because some of these sales end tomorrow, June 26.

Travel is available through Oct. 30 for most routes. 

Sample fares (roundtrip):

• Denver-Phoenix ... $156
• Indianapolis-Phoenix ... $159 
• Milwaukee-San Diego ... $162
• Reno-San Diego ... $162
• Denver-San Diego ... $165
• Burlington, Vt.-Phoenix ... $185
• Providence-San Diego ... $185
• Boise-San Diego ... $186
• Newark-Phoenix ... $194
• Ft. Lauderdale-San Diego ... $205

Some sales allow travel any day of the week, but availability is limited and the most sought-after dates will sell out fast.  If you cannot find the advertised deal on the first try, try an off-peak day, like a Tuesday or a Wednesday to get a lower fare.

Again, you must book by Thursday, June 26, at midnight ET.  

Click here to use Travelzoo's SuperSearch and find the best deals on major airlines. 

Travelzoo Tips:

• No one site always has the best fare -- try a few different providers to make sure you get the best deal
• If you don't get the sale fare on your first attempt, try departing or returning 1 day sooner or later
• Be careful not to restrict your search to only nonstop flights

SuperSearch uses more than 2.8 million consumer ratings and Travelzoo's expertise to help you find the best fares. Plus, you can easily compare multiple sites without entering your information over and over.

Note: Some sites will initially display roundtrip pricing that includes all taxes and fees. For the fares above, that will usually range between $204-$258.