Many of the largest airlines in the United States offer weekly, online-only fares, perfect for quick weekend getaways.

For travel novices, these Internet deals are last-minute airfare specials offered each Tuesday for travel on the upcoming weekend. Most fares are non-refundable and must be purchased immediately, but these specials often represent significant savings over advance purchase fares.

United Airlines — Dozens of Internet specials this week, mostly to or from their hubs in Houston, Newark, Chicago, Cleveland and Denver. Purchase before 11:59 p.m. (EDT) September 7. Departures after 7 p.m. on September 7 or anytime September 8 and return on Monday, September 10 or Tuesday, September 11.  Taxes and airport fees are additional.  This week's fares include:

  • Chicago to Atlanta – $221
  • Chicago to Ottawa, Ontario, Canada – $298
  • Cleveland to Orlando – $271
  • Denver to Austin – $271
  • Denver to San Diego – $271
  • Los Angeles to Tucson – $161

US Airways — There are no US Airways Web deals for this week.

Delta Airlines Web Deals — Purchase Delta Web deals by 11:59 p.m. (EDT) on September 8 for travel departing anytime September 8 and returning on September 11 or September 12. Highlights include:

  • Atlanta to Dallas – $240
  • Atlanta to Miami – $220
  • Cincinnati to Orlando – $240
  • Detroit to Tampa – $240
  • Cleveland to LaGuardia – $200

American Airlines Net Fares — There are no American net fare specials for either this weekend or next weekend.

Remember there are a limited number of seats available for these airfares and they may sell out at any time. Read the fine print before you purchase.

Have you picked up any of these great airfare specials? Tell us about it in the comments.

Weekly Internet Airfare Deals: Roundtrip Airfares from $161