Frontier’s large-scale sale offers travel on more than 2,100 routes, and is an almost exact duplicate of Southwest’s promotion from earlier in the week. Also check out AirTran, American, and US

Virgin America’s latest sale features fall flights to Las Vegas, New York City, and San Diego, among a handful of other destinations. One-way sale fares start at $39, and they’re often the lowest.

AirTran announced sale fares for travel into 2011 and now American has jumped in with a matching promotion. Between both carriers, find about 4,000 discounted routes. Also look into competing rates from Continental, Delta, Southwest, plus others.

Southwest’s latest sale offers more than 1,600 discounted routes to nearly 70 destinations, but look to American, Continental, Midwest, United, or another Southwest rival for up to 65 percent in savings.

Southwest’s latest sale offers more than 1,600 discounted routes to nearly 70 destinations, but look to American, Continental, Midwest, United, or another Southwest rival for up to 65 percent in savings.

Summer isn’t over yet! Enjoy the last of the warm weather on the beach, golf course, ballpark, or by exploring a new destination. Here are five ways to get out of town for a last-hurrah summer trip, or to get a jumpstart on fall travel.

Virgin America’s latest sale features fall flights to Las Vegas, New York City, and San Diego, among a handful of other destinations. One-way sale fares start at $44, and they’re often the lowest, though US

Aeromexico has announced discounted September flights to visit our southern neighbors. Flights are available to Guadalajara, Hermosillo, Mexico City, and Monterrey. Find competition from American, Continental, Delta, and US Airways.

Fly to the other side of the world with American’s latest sale. The airline is offering discounted fares to Japan’s capital city, Tokyo, this fall and winter. These are the lowest prices, though Continental, Delta, and United match prices.

With 31 destinations to choose from, Alaska’s discounted fares to Austin, Los Angeles, Portland, and Seattle, among other cities, are worth a look. Find competition from Continental, Delta, US Airways, and others.

Lufthansa’s latest sale includes popular and off-the-beaten-path destinations in Europe such as Belgrade, Budapest, Casablanca, Johannesburg, Prague, and others. Competition comes from

Ultra-low-cost carrier Spirit has slashed prices on its U.S., Caribbean, and Latin America routes for members of its fare club. Travel at these prices is valid on specific dates in October and December, but book sale fares before they expire.

Virgin America is growing up. Though Virgin America’s sister airlines have much experience traversing oceans, U.S.-based Virgin America will have its first international ventures come December to our neighbors down south.

AirTran has just announced a massive three-day sale with about 3,800 discounted routes. American, Delta, Spirit, and others have lowered their unadvertised fares to compete with these sale prices.