Book your stay at the Mainstay Suites St. Louis - Airport hotel in Bridgeton, MO. Our pet-friendly hotel offers a variety of different amenities including a fitness center, free hot breakfast, free Wi-Fi and guest laundry. All guest rooms include a fully-equipped kitchen, iron and board, and sofa bed. Stay conveniently close to the St. Louis Zoo, Missouri Botanical Garden and Gateway Arch. Book today!