We’ve added American Airlines to our roundup of weekly Internet airfare specials starting this week. For those unfamiliar with these offers: a number of US airlines offer last-minute airfare specials beginning on Tuesdays for travel on the upcoming weekend, including this weekend. Most fares are non-refundable and must be purchased immediately, but these specials often represent significant savings even over the advance purchase fares. Below is a recap of this week's offerings.

United/Continental Airlines – United/Continental Airlines offers dozens of Internet specials this week, mostly to or from their hubs in Houston, Newark, Chicago, Cleveland and Denver. These fares must be purchased by 11:59 PM, Central on Friday, April 20  and apply to departures after 7 PM on April 20 or anytime April 21 with returns on Monday, April 23 or Tuesday, April 24.  Taxes and airport fees are additional.  A sampling of this week's fares include:

  • Atlanta to Houston – $220
  • Cleveland to Baltimore – $161
  • Chicago to Huntsville – $221
  • Chicago to Memphis – $157
  • Denver to San Francisco – $271
  • Huntsville to Washington DC – $221

US Airways – US Airways also offers weekly Internet specials. Their E-saver fares for this week must be purchased by 11:59 PM, Eastern on April 21 for travel departing April 21 and returning April 24. The best fares I found include: (roundtrip without taxes and fees)

  • Columbia, SC to Washington DC – $230
  • Charlotte to Jacksonville – $200
  • Memphis to Washington DC – $250
  • Philadelphia to Cincinnati – $230
  • Phoenix to San Francisco – $240

Delta Airlines Web Deals – Delta, like the others, offers airfares between special cities (often including their hub, Atlanta) for travel on the weekend. Tickets for these specials must be purchased by 11:59 PM on Saturday, April 21 and are non-refundable, once purchased. You must depart on Saturday, April 21 and return on Monday, April 23 or Tuesday, April 24. Below is just a sampling of this week’s specials. The fares listed are roundtrip and do not include taxes or airport fees, if applicable. This week’s highlights include:

  • Atlanta to Cincinnati – $180
  • Cleveland to New York/Kennedy – $180
  • Dallas to Minneapolis – $220
  • Detroit to Newark – $180

American Airlines Net Fares – American Airlines offers both specials for this weekend and the following weekend, provided you purchase your tickets no later than 11:59 PM, Central on April 20. Travel for this weekend’s fares is April 20 after 7 PM or April 21 anytime with return travel on April 23 or 24. For the following weekend, travel is limited to departures on April 27 after 7 PM or anytime April 28 with return travel on April 30 or May 1. Highlights include:

This weekend:

  • Columbus, OH to New York/Kennedy – $196
  • Minneapolis to New York/LaGuardia – $238
  • Austin to Los Angeles – $250

Next weekend:

  • St. Louis to New York/LaGuardia – $150
  • Nashville to New York/LaGuardia – $176
  • Cincinnati to Miami – $270

Keep in mind that there are a limited number of seats for these Internet deals and they may sell out at any time. Be sure to read the fine print before purchasing your tickets, but if you see something that interests you, it's a good idea to buy your tickets immediately to avoid being disappointed.

Internet Airfare Specials: Airfares from $150 Roundtrip