This chart lists the lowest generally available round-trip fares from at least one of the three Washington area airports -- Reagan National, Washington-Dulles International and Baltimore/Washington International -- for departures July 18-24. Flights are nonstop or direct (stopover with no change of planes) except for some international flights. For ticket information, or to purchase tickets, call the individual airlines, not The Washington Post. For recorded information on how best to use this chart, call 202-334-7591.

Bargain of the Week

Southwest Airlines will begin offering nonstop service between BWI and Las Vegas on Aug. 5, and will promote the new service with a special $99 one-way fare. You must purchase tickets by July 9. The fare is valid only for nonstop flights, seats are limited, and you must complete travel by Oct. 29. Information: 1-800-435-9792, www.southwest. com.

Airlines

AA

American

AC

Air Canada

BA

British Airways

CO

Continental

DL

Delta

FL

AirTran

HP

America West

LH

Lufthansa

NW

Northwest

SY

Sun Country

UA

United

US

US Airways

WN

Southwest

Depart Washington July 18-24

New York

$108

UA, US

Boston

$128

US

Miami

$168

UA, US

Chicago

$144

US

Atlanta

$164

FL, DL,

Kansas City

$208

WN

Minneapolis

$278

SY

Denver

$318

UA

Dallas

$214

AA, UA

Las Vegas

$380

HP

Los Angeles

$386

UA, US

San Francisco

$383

UA, US

Seattle

$432

UA

Toronto

$273

AC, US

Mexico City

$353

DL

Rio de Janeiro

$1,116

CO

London

$718

BA

Frankfurt

$1,293

LH

Tokyo

$1,457

NW, UA

Fares, which were researched Thursday, may change without notice, do not apply to all seats on all flights and are subject to restrictions. Most require advance purchase, are available only on midweek departures and require a Saturday night stay. Certain airport taxes and surcharges are not included. Contact airlines or a travel agent for fare details and airports of arrival and departure.

SOURCES: Internet travel services and airlines.