Each week, United publishes what they call E-Fares which are basically discounts on flights for this weekend on routes that have a surplus of seats available. Here are the United E-Fares from their newsletter for the Weekend of May 23rd:

Please note – the prices listed are for one-way and do not include taxes & fees, and no doubt have other terms and restrictions you should look into. Some routes may be provided by United Express or other code share partners. For full details, and to search for additional deals, please visit the United E-Fares page.

This weekend’s E-Fares
Sample fares are for travel departing after 7 p.m. on Friday (May 23, 2008) or anytime on Saturday (May 24, 2008) and returning anytime on Tuesday (May 27, 2008) or Wednesday (May 28, 2008).

Bismarck (BIS) – Denver (DEN): $85
Columbia (CAE) – Washington, D.C. (IAD): $75
Des Moines (DSM) – Denver (DEN): $92
Eugene (EUG) – San Francisco (SFO): $75
Greenville (GSP) – Washington, D.C. (IAD): $75
Lincoln (LNK) – Denver (DEN): $75
Orange County (SNA) – San Francisco (SFO): $75
Santa Barbara (SBA) – San Francisco (SFO): $75
Washington, D.C. (IAD) – Columbia (CAE): $75

Next weekend’s E-Fares
Sample fares are for travel departing after 7 p.m. on Friday (May 30, 2008) or anytime on Saturday (May 31, 2008) and returning anytime on Monday (June 2, 2008) or Tuesday (June 3, 2008).

Durango (DRO) – Denver (DEN): $80
Greensboro (GSO) – Chicago (ORD): $96
Knoxville (TYS) – Washington, D.C. (IAD): $80
Medford (MFR) – San Francisco (SFO): $80
New York (LGA) – Chicago (ORD): $109
Phoenix (PHX) – San Francisco (SFO): $102
Seattle (SEA) – San Francisco (SFO): $105
Washington, D.C. (IAD) – Greenville (GSP): $80
Wichita (ICT) – Denver (DEN): $80

International E-Fares
Sample fares are for travel beginning Monday (May 26, 2008) through Thursday (May 29, 2008) and returning Monday (June 2, 2008) through Thursday (June 5, 2008).

Chicago (ORD) – Frankfurt (FRA): $502
Chicago (ORD) – Munich (MUC): $502
Denver (DEN) – London (LHR): $452
Los Angeles (LAX) – Frankfurt (FRA): $517
Los Angeles (LAX) – London (LHR): $437
San Francisco (SFO) – Frankfurt (FRA): $529
Washington, D.C. (IAD) – Amsterdam (AMS): $449

International E-Fares Specials
Sample fares are for travel beginning Monday (June 2, 2008) through Thursday (June 5, 2008) and returning Monday (June 9, 2008) through Thursday (June 12, 2008).

Boston (BOS) – Frankfurt (FRA): $488
Chicago (ORD) – Amsterdam (AMS): $584
Los Angeles (LAX) – Frankfurt (FRA): $527
New York (JFK) – Frankfurt (FRA): $374
Washington, D.C. (IAD) – Amsterdam (AMS): $471
Washington, D.C. (IAD) – Brussels (BRU): $478
Washington, D.C. (IAD) – Zurich (ZRH): $553

For more details and to search for, or book a flight, visit the United E-Fares page.