If the flight itinerary that you found using ITA Matrix is still available, you should be find it using Hipmunk as well.
Start by running a basic round trip flight search. Visit www.hipmunk.com/flights and enter your travel cities, dates, and number of passengers. Then click the orange “search” button. For complex multi-city searches, make sure to select the “Multi-city” option above the search bar.
Once the results load, use the airline filter and time sliders to find flight options that match the carrier and time of the flight you are looking for. For details on how to use the filters, visit our article “Navigating through flight results/Booking a flight”
Once you narrow down the flight options, you can hover your mouse over each flight bar to see quick details of that option, including the departure/arrival airport, airline, departure/arrival times, flight number, cabin class and type of aircraft.
Once you find all of the individual flights that are listed in your ITA Matrix itinerary and select each leg using the steps above, a Hipmunk flight details page will appear with booking options from different airlines and/or 3rd party providers.
By clicking any of the “Book” buttons, you will be redirected to the airline or third party provider site, like to make the final reservation. After paying for your reservation, the company you book with will send you your emailed flight confirmation.