The summer travel season is prime time for offline viewing. And if you're among the millions of Americans who'll take that long-planned trip to Yosemite or the Grand Canyon this year, you might want to download movies, TV shows, and other content to entertain yourself along the way.

Whether it's binge-watching Netflix’s “Stranger Things” (shown above) or a nonstop loop of Pixar favorites, the last thing you want to think about is the airplane's weak WiFi or the data overage fees associated with the kids streaming video in the backseat of your SUV.

When it comes to offline viewing, not all of the streaming services have options to offer.

While fans of the Netflix programs “A Series of Unfortunate Events” and “Black Mirror” can rejoice in this brave new world, the throngs of "Westworld" viewers are still out of luck because HBO Now requires an internet connection. The same goes for Crackle from Sony Pictures Entertainment, home to feature films and original shows such as "StartUp" and "Snatch."

More on Watching TV

But Hulu says it will soon allow users to download content for offline viewing. To date, though, it has offered no start date and no details on which shows will be available.

Here’s a rundown of the streaming services that do offer offline viewing.

Amazon Prime Video: This service, included with a Prime subscription, offers many downloadable titles, including feature films like "Paterson" and the acclaimed original series "The Man in the High Castle." And now that the Prime Video app is finally available in the Google Play store, it's much easier to use it to access that content on Android devices. Apple fans can find the iOS version in the company's App Store, and the Prime Video app comes pre-installed in Amazon's Fire devices.

Netflix: The king of streaming services allows users to download some movies and series to mobile devices through its Netflix app. These titles include original series such as "Love," "Queer Eye," and "Altered Carbon," and the company updates the list every month. You'll see a download button on the details page if a particular show can be downloaded. Users need to use the latest version of the app.

YouTube Red: Google's monthly subscription service allows you to watch videos without ads and gives you access to exclusive content, such as "Cobra Kai" and "Step Up: High Water," not to mention songs on Google's Play Music. And yes, subscribers have the option to download videos to view offline. Users in India and a host of other countries receive the service free, but U.S. consumers have to dole out $10 per month ($15 for the family plan). 

Other Options

iTunes, Google Play, VUDU, FandangoNOW, and Amazon Prime Video store: These services offer a large selection of rentals for a modest price, including free access to some content and videos you've purchased in the past. Better yet, the typical rental period is 30 days or longer. And once you're finished watching the content, it deletes itself. That allows you to load up on movies or TV shows for the outbound journey, then add all new content for the way home.

Showtime, Starz, and Epix: These premium channels allow subscribers to download videos from their libraries onto mobile devices via their corresponding apps. That means popular titles on Showtime ("Homeland" and "Billions") and Starz ("Outlander" and "Ash vs. Evil Dead") and Epix's collection of movies can fill time during your trip without burning through your data plan. The stand-alone subscription services from Showtime and Starz offer the same benefits for $11 and $9 per month, respectively.

Vimeo: Most of this content, including TED Talks and indie films, can be downloaded onto a smartphone or tablet. But content from the platform's TV partnerships with Lionsgate and Starz isn't available for offline viewing. So sorry; no watching "Mad Men" or "Weeds."

Before you hit the road, remember to:

• Check the storage space on your device. Your media file won't download if there's not enough room—simple as that. So take a little time to dispense with stuff you no longer need.

• Download your travel fare while you're at home instead of relying on your cellular data service. On my high-speed WiFi connection, for example, it took about 7 minutes to download "Up in the Air" from Amazon Prime Video.

• Consider opting for standard-definition downloads. It takes up less than half a GB of data for a 2-hour movie. If you're viewing on a smartphone, the quality drop isn't too noticeable.

Editor's Note: This article has been updated to include information on current offerings.