We're seeing some super unadvertised domestic fares on United today. Mostly to and from American hub cities in Charlotte (CLT), Dallas (DFW), Philadelphia (PHL), and Phoenix (PHX), but a few other cities are included as well. Fares start at $110 roundtrip. There are even a few big price drops on flights to Costa Rica!

These are all big price drops, which normally don't last very long after falling this low. Secure your low fare by booking now and taking advantage of the 24-hour risk-free cancellation to think about your plans.

Travel rules and restrictions vary by route. In general, flights from/to Charlotte and Phoenix are valid on Tuesdays and Wednesdays, through April. Flights to/from Philadelphia are valid on Tuesdays and Wednesdays, through December. And flights from/to Dallas are valid for daily travel or Tuesdays, Wednesdays, and Saturdays, year-round. Costa Rica flights are only available on a few scattered winter travel dates.

Peak holiday travel will be more expensive. Click on the fare details for complete booking info.

A sample of fares include:

Phoenix to Santa Fe $110 roundtrip

Columbus to Charlotte $113 roundtrip

Charlotte to Indianapolis $113 roundtrip

Philadelphia to Columbus $114 roundtrip

Philadelphia to Pittsburgh $114 roundtrip

Pittsburgh to Raleigh $114 roundtrip

Norfolk to Philadelphia $114 roundtrip

Philadelphia to Roanoke $114 roundtrip

Rochester to Philadelphia $114 roundtrip

Phoenix to Palm Springs $114 roundtrip

Phoenix to Santa Barbara $114 roundtrip

San Luis Obispo to Phoenix $114 roundtrip

Pittsburgh to San Diego $134 roundtrip

Charlotte to Bangor $182 roundtrip

Dallas to Richmond $186 roundtrip

Dallas to Palm Springs $186 roundtrip

Columbia to Dallas $188 roundtrip

Dayton to Dallas $188 roundtrip

Dallas to Lexington $188 roundtrip

Charlotte to San Jose, Costa Rica $196 roundtrip

Dallas to San Jose, Costa Rica $202 roundtrip Overnight layover required!

All domestic fares work in the reverse direction as well. There may be more similar price drops. Check flights from your city to see today's current finds.

These are Basic Economy fares, which only include a small personal item. The upgrade to a standard Economy fare on these routes varies by route, but it is mostly $30 each way to upgrade. If you need to check a bag, keep in mind that checked bag fees are the same $30 fee for both Basic Economy and standard Economy.

If you have a United credit card or elite status, some of the restrictions may not apply. For more info, check out our guide to Basic Economy for domestic travel.

As an example, I found seats departing Charlotte CLT on Monday, January 28, returning from San Jose SJO on Sunday, February 3, for $196 roundtrip.

Above image by NextNewMedia via Shutterstock.