How much can you save by buying miles toward a business or first class flight? A lot

Here are some sample scenarios for spending US Airways miles you've bought with a 100% mileage bonus, on various flights, with a comparison of how much the fares would cost if you bought them in cash. Flights were researched in June 2011 for travel departing July 5 and returning July 12. Keep in mind that award seats won't be available on all flights, and on some travel dates you might need more miles than those stated here.

City pair

Airline routing

Class of Service and mileage required round-trip

Cost of  ticket if purchased in cash round-trip including tax

Cost in cash (and miles if applicable) round-trip with purchased miles assuming 100% purchase bonus

Your savings (plus whatever it "cost" to attain additional miles)

New York -Sydney

United JFK-San Francisco-Sydney

Business Class

110,000 miles

$10,636

$1,475 (cost of 50,000 miles plus 50,000 mile bonus)+10,000 existing US Airways miles

$9,161

New York-Sydney

United JFK-San Francisco-Sydney

First Class 160,000 miles

$22,138

$1,475 (cost of 50,000 miles plus 50,000 mile bonus) plus 60,000 existing US Airways miles

$20,663

Chicago-Auckland

United/Air New Zealand Chicago-San Francisco-Auckland

Business Class 110,000 miles

$13,169

$1,475 (cost of 50,000 miles plus 50,000 mile bonus)+10,000 existing US Airways miles

$11,694

San Diego-Rome

US Airways

San Diego-Philadelphia-Rome

Business Class 100,000 miles

$3,333

$1,475 (cost of 50,000 miles plus 50,000 mile bonus) 

$1,858

Tampa-Istanbul

United/Lufthansa

Tampa-Washington Dulles-Frankfurt-Istanbul

Business Class 100,000 miles

$4,126

$1,475 (cost of 50,000 miles plus 50,000 mile bonus) 

$2,651

Dallas/Ft. Worth-Osaka

United

DFW-San Francisco-Osaka

Business Class 90,000 miles

$6,019

$1,237.50 (cost of 45,000 miles plus 45,000 mile bonus)

$4,781.50

Dallas/Ft. Worth-Osaka

United

DFW-San Francisco-Osaka

First Class 120,000 miles

$12,684

$1,475 (cost of 50,000 miles plus 50,000 mile bonus)+20,000 existing US Airways miles

$11,209

San Francisco-Buenos Aires

United

SFO-Houston-Buenos Aires

Business Class 100,000 miles

$8,074

$1,475 (cost of 50,000 miles plus 50,000 mile bonus) 

$6,599

Philadelphia-Honolulu

US Airways

PHL-Phoenix-Honolulu

First Class 70,000 miles

$2,903

$962.50 (cost of 35,000 miles plus 35,000 mile bonus) 

$1,940.50

Philadelphia-Honolulu

United

PHL-Houston-Honolulu

Economy Class 40,000 miles

$1,025

$550 (cost of 20,000 miles plus 20,000 mile bonus)

$475

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