Yes, they use the same toilets. I often fly on 737s, and when the cockpit crew need the toilet, the flight attendants have a process to maintain security. No special toilets for crew. We usually go to the front toilets from business class as they tend to stay cleaner.

On most standard narrow-body aircraft (like a Boeing 737 or Airbus A320), flight attendants do not have their own private bathroom and must use the same lavatories as the passengers. However, on large, wide-body aircraft used for long-haul international flights (like the Boeing 787 Dreamliner or Airbus A350), there is often a dedicated crew rest area which sometimes includes its own "hidden" or separate bathroom. These crew rest compartments are located above or below the main passenger cabin and are designed to allow the crew to take mandatory breaks during 12+ hour flights. In 2026, even without a dedicated "crew-only" lavatory, many airlines have a protocol where a specific bathroom—usually the one at the front of the aircraft near the cockpit—is temporarily blocked off for crew use to ensure the safety and security of the pilots during a break. For the majority of your flight attendants' shifts, they are sharing the "comfortable yet uncomfortable" public lavatories with everyone else, which is why they are often seen performing quick cleanings of the facilities throughout the journey to maintain a standard of hygiene for both themselves and the passengers.