An Ocean of Minutes by Thea Lim
In September 1981, Polly and Frank arrive at the time travel terminal at Houston Intercontinental Airport. One will travel, and one will stay.
America is in the grip of a deadly flu pandemic. Frank has caught the virus and Polly will do whatever it takes to save him, even if it means risking everything. So she agrees to a radical plan—time travel has been invented in the future to thwart the virus. If she signs up for a one-way-trip into the future to work as a bonded laborer, the company will pay for the life-saving treatment Frank needs. Polly promises to meet Frank again in Galveston, Texas, where she will arrive in twelve years.
But when Polly is re-routed an extra five years into the future, Frank is nowhere to be found. Alone in a changed and divided America, with no status and no money, Polly must navigate a new life and find a way to locate Frank, to discover if he is alive, and if their love has endured.