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Slow Cooker Flank Steak

Slow Cooker Flank Steak is cooked to perfection every time — no need for constant temperature checks! Using your crockpot is a simple, no-fuss way to enjoy a lean cut of beef that’s full of flavor and melt-in-your-mouth goodness.

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overhead shot of crock pot flank steak topped with cilantro

Cooking up a juicy piece of flank steak has never been easier!

The secret to the perfect slow cooker flank steak is marinating it in a flavorful homemade steak marinade before cooking. This not only adds flavor but also helps to tenderize the meat.

No need to worry about constantly checking the temperature or flipping the steak – just set it and forget it!

When you are ready to serve it to your family, just prep some of your favorite side dishes — mashed potatoes and mushroom gravy pair great with this recipe.

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The end result? A deliciously tender and flavorful slow cooker flank steak that will have everyone coming back for seconds.

ingredients needed to make slow cooker flank steak

How to Make this Flank Steak Crock Pot Recipe

A full printable version of this recipe with ingredient measurements is available at the bottom of this post.

STEP ONE: Mix the marinade ingredients in a small bowl.

STEP TWO: Place the marinade and flank steak into the Crock Pot. Coat the steak with the marinade and flip it once before cooking.

adding raw marinated steak to crockpot
cooked marinated steak in the slow cooker

STEP THREE: Cook the steak for about 6 hours on the low setting or 3-4 hours on high until the meat becomes very tender.

STEP FOUR: Once cooked, carefully move the steak to a cutting board. Let it rest for 5-10 minutes, then slice it against the grain and serve.

What to Serve With Slow Cooker Flank Steak

Any good steak dinner comes with a side of potatoes like these twice-baked mashed potatoes or a baked sweet potatoes.

For a healthy side dish, try a simple side of roasted carrots and asparagus or a fresh salad with bleu cheese dressing!

sliced flank steak on a wooden cutting board

Variations for Flank Steak Crock Pot Recipes

  • Fresh herbs elevate both the flavor and aroma of your marinade! Try rosemary, thyme, or basil — just be sure they don’t sneak their way into the slow cooker. 
  • Marinade the steak before cooking. If you have time — place the marinade and steak in a Ziploc bag and marinade it for 2 to 12 hours in the fridge.
  • A simple seasoning of salt and pepper is plenty for the marinade, but steak seasoning is a great alternative that can kick your flank steak in the crock pot up a notch.
  • Switch up the flavor for this crock pot flank steak recipe! By experimenting with various marinades, such as sweet and savory teriyaki, zesty chimichurri, or a refreshing lemon herb blend, you can create a perfectly personalized masterpiece. 
  • Experiment with the acidity by choosing from various types of vinegar, such as deep and rich balsamic, robust red wine vinegar, or tangy apple cider vinegar. They each add a unique flavor to your marinade.

More Slow cooker Beef Recipes 

overhead shot of marinated flank steak cooked in the slow cooker on low

How Can I Keep My Crock Pot Flank Steak from Getting Chewy?

Chewy steaks are typically due to overcooking. But in the case of a slow cooker, it’s actually because the steak is undercooked! 

Give the flank steak the full 6 hours to cook on low, then check to see if it needs more time — it can take up to 8 hours, depending on the size of the steak. If you need it done sooner, then you’ll need to cook it on high instead. 

It’s also important to cut against the grain for tender slices. Find the lines that run throughout the meat, then cut across them with your knife. This shortens the fibers, making the beef easier to chew.

What’s the Difference Between Flank Steak and Skirt Steak?

While both are flavorful cuts, skirt steak is thinner and cooks quickly, while flank steak is thicker and benefits from longer, slow cooking. 

This extended cooking time allows the fibers of the meat to break down properly, resulting in a tender and succulent dish. 

How Can I Store Slow Cooker Flank Steak?

Keep leftover slices of cooked flank steak in an airtight container in the refrigerator. They will keep for up to 4 days

You can also freeze flank steak for up to 3 months. Wrap in a layer of plastic wrap or foil, then store in a freezer-safe bag. Thaw in the refrigerator before reheating.

It’s best to reheat steak slowly on the stovetop with a splash of liquid so it doesn’t overcook. If you must use the microwave, heat at 50% power in 30-second bursts until warmed through.

shredding flank steak on a wooden cutting board

More Steak Recipes To Try

overhead shot of crock pot flank steak topped with cilantro

Slow Cooker Flank Steak

Samantha Erb
Cook juicy, flavorful flank steak in the crockpot with just a handful of ingredients! Perfect for busy weeknights, all you need to do is to set it and forget until dinner.
5 from 5 votes
Prep Time 5 minutes
Cook Time 6 hours
2 hours
Total Time 8 hours 5 minutes
Course Slow Cooker
Cuisine American
Servings 4 servings
Calories 617 kcal


  • 1.5-2 pounds flank steak
  • cup balsamic vinegar
  • ¼ cup neutral cooking oil
  • 2 tablespoons honey
  • 1 tablespoon Worcestershire sauce
  • 1 tablespoon Dijon mustard
  • 1 teaspoon garlic minced
  • ½ teaspoon kosher salt
  • ½ teaspoon ground black pepper


  • Mix the balsamic vinegar, oil, honey, worcestershire, dijon mustard, garlic, salt, and pepper in a small bowl
  • Place the flank steak and marinade ingredients in the slow cooker and flip the steak once or twice to coat the steak.
  • Cook undisturbed for 6 hours on low or 3-4 hours on high until very tender. 
  • When the cooking time is done, carefully transfer the steak to a cutting board, slicing it against the grain and serving as desired.


You can marinade the steak overnight by placing the marinade ingredients and steak in a Ziploc bag.


Serving: 1gCalories: 617kcalCarbohydrates: 14gProtein: 63gFat: 33gSaturated Fat: 9gPolyunsaturated Fat: 21gCholesterol: 179mgSodium: 433mgSugar: 12g

This nutrition information is based on the exact products I used in this recipe. Brands and sizes of products could alter exact nutrition and should always be calculated independently.

Tried this recipe?Let us know how it was!


About Samantha

I’ve always had a love of cooking and creating new recipes, so it only made sense to create a food blog so I could share those recipes with you. This site is designed to provide easy and flavorful recipes with as little ingredients as possible. That means you still get great flavor combinations without all that extra time and effort. Read more...

2 thoughts on “Slow Cooker Flank Steak”

  1. I will definitely try the flank steak recipe. The photo appears to show a sear on the steak. Slow cooker wouldn’t do that. Sear it first? Thank you

    • Hi David, yes, I recommend searing your flank steak when you can before slow cooking if you want that crusted look on top. It also helps hold the juices in. The recipe will taste delicious without it as well.

5 from 5 votes (5 ratings without comment)

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