CheapOAir.com offers select national roundtrip flights for as low as $92 via code FLIGHTS10 through 4/21. With fuel surcharges included, that puts many rates at the lowest total price. Plus, new routes are available with depatures from Boston, Seattle, Chicago, and more. Note that is does not stack with previously reduced flights and that it applies to flights on Tuesday, Wednesday, and Thursday for travel through 5/31. A 21-day advance purchase may be required, and blackout dates and taxes may apply. Check the coupon status after entering it during booking to see if it applies to the flight you've selected.