Cheap flights from Portland, OR to Sidney, MT

Travelers frequently search for route combinations, such as Portland and London, San Francisco, Dublin, Phoenix, Washington, D.C., Atlanta, Denver, Las Vegas, Los Angeles, St. Louis, Barcelona, New York, Austin, San Diego, Chicago, Bangkok, Tallinn, Minneapolis, Santa Ana, Philadelphia.

Travelers frequently search for route combinations, such as Sidney and New York, Orlando, Las Vegas, Denver, Chicago, Miami, Los Angeles, Atlanta, Mexico City, Bogotá, Dallas, Phoenix, Philadelphia, San Francisco, Cancún, Houston, San Juan, Washington, D.C., Dhaka, Fort Lauderdale.

The main airport in Portland is Portland International. It is also served by Seattle–Tacoma International, Portland International, Eugene, Roberts Field, Kenmore Air Harbor Seaplane Base.

The main airport in Sidney is Sidney–Richland Municipal. It is also served by Minot International, Sidney–Richland Municipal, Dawson Community, L. M. Clayton, Glasgow, Dickinson Theodore Roosevelt Regional.

Yes, it's possible to combine different modes of transport between Portland and Sidney thanks to our Virtual Interlining technology. Making use of not only flights but also trains and buses between Portland and Sidney can give rise to new adventures. Read more about how Virtual Interlining works on Kiwi.com Stories.

Virtual Interlining provides a revolutionary way of traveling. You can combine different modes of transport like flights, trains, and buses into one itinerary. And this often saves money. Thanks to the world's largest carrier database, the Kiwi.com search function enables anyone to mix and match different modes of transport easily.

Currently, you can fly between Portland and Sidney with Cape Air, Alaska Airlines, Allegiant Air, Frontier Airlines, Spirit Airlines.

If you don’t have specific dates for your trip between Portland and Sidney, you can enter a date range into the departure and return fields. Most carriers on the Kiwi.com website allow you to search and book up to six months from the day of your search. Order the search results by the best, cheapest, or fastest route, or find the cheapest outbound and return combination in the pricing table.

Traveling between Portland and Sidney, you can choose between direct (nonstop) flights or flights with one or more stops. You can select the number of stops on your journey, including an overnight stopover, and the duration of the stopover. What's more, you can also select where you want to have your stopover. Want to say "Hi" to a friend in another city en route to your destination? Or fancy a quick round of shopping? Go Multi-City or Nomad and add places to your search that you wish to visit.