JetBlue has round-trip flights from Los Angeles (LAX) to San Jose del Cabo (SJD) for $230-$244, NONSTOP. Flights August to September. Departures on Monday, Tuesday, Wednesday, Saturday, and Sunday. Very few extended weekends available. Origin/Destination reversible.
JetBlue’s “Basic” fares only allow a small personal item (17 x 13 x 8 inches), like a Jansport SuperBreak backpack without a fee. A regular sized carry-on bag will incur a bag fee. To avoid bag fees, consider using a credit card with the “first free checked bag” perk.

