Soba vs Udon: Key Differences & How to Choose

Soba and udon are two of Japan’s most beloved noodles, but they are surprisingly different in taste, texture, and how they are used. Soba is a thin, nutty buckwheat noodle with a firm bite, while udon is a thick, soft, and chewy wheat noodle with a neutral flavor. This guide breaks down their key differences so you can pick the right noodle for your dish, and includes a simple dipping noodle recipe for both.

Ingredients

4 bundles (about 14 oz / 400 g) dried soba noodles
4 bundles (about 14 oz / 400 g) dried udon noodles
1 cup (240 ml) cold water
1/2 cup (120 ml) soy sauce
1/4 cup (60 ml) mirin
1 teaspoon (5 g) sugar
1 sheet (3 g) dried kombu (kelp), optional
1 cup (20 g) loosely packed bonito flakes (katsuobushi), optional
4 scallions, thinly sliced
1 sheet (10 g) nori, cut into thin strips, for garnish
Wasabi paste and grated fresh ginger, for serving

Instructions

Make the dipping sauce (tsuyu): In a small saucepan, combine the cold water, soy sauce, mirin, and sugar. Add the kombu if using. Bring to a simmer over medium heat, then remove from heat just before it boils. Remove the kombu, add the bonito flakes, and let steep for 2 minutes. Strain through a fine-mesh sieve and let cool to room temperature. Refrigerate until cold.
Cook the soba: Bring a large pot of water to a rolling boil. Add the soba noodles and stir gently to separate. Boil according to package directions, usually 4-5 minutes, until tender but still slightly firm (al dente). Drain into a colander and rinse under cold running water, rubbing the noodles gently to remove excess starch. Drain well.
Cook the udon: Bring another large pot of water to a boil. Add the udon noodles and stir. Boil according to package directions, usually 8-10 minutes for dried udon, until soft and chewy. Drain and rinse under cold water, then drain well.
Portion the noodles: Divide the soba noodles among 4 plates or bamboo trays. Divide the udon noodles among 4 separate plates or bowls. Top each portion with a few slices of scallion and a sprinkle of nori strips.
Serve: Pour the chilled dipping sauce into 4 small bowls. Serve each person a plate of soba and a plate of udon, with small mounds of wasabi and grated ginger on the side. To eat, pick up a small bundle of noodles with chopsticks, dip them into the sauce, and enjoy.

Tips

Rinse thoroughly: Rinsing cooked noodles under cold water stops the cooking process and removes surface starch, which keeps the noodles from sticking together. This step is essential for both soba and udon.
Don’t overcook: Soba can turn mushy quickly, and udon becomes too soft. Always set a timer and check the noodles a minute before the package time suggests.
Use the right water: Boil noodles in plenty of water—at least 4 quarts (3.8 L) per 4 ounces (115 g) of dried noodles—so they have room to move and cook evenly.
Substitute for bonito flakes: If you’re vegetarian or can’t find bonito flakes, simply omit them and add a 1-inch piece of kombu to the sauce. The sauce will be less smoky but still delicious.

Serving Suggestions

Serve the noodles cold with the dipping sauce as a refreshing summer meal. For a heartier version, serve the noodles hot in a warm broth made by heating the tsuyu with 2 cups (480 ml) of dashi or vegetable stock. Add tempura shrimp, a soft-boiled egg, or sliced chicken for extra protein. Soba is also excellent with a sprinkle of shichimi togarashi (Japanese seven spice) for heat.

Variations

Zaru Soba: Serve the soba on a bamboo mat with the dipping sauce, garnished with nori and scallions. This is the classic cold presentation.
Kitsune Udon: Serve the udon hot in a mild broth topped with a sweetened fried tofu pouch (abura-age).
Yakisoba: Stir-fry cooked soba with sliced cabbage, carrots, and a sweet-savory sauce (like Worcestershire-based yakisoba sauce) for a quick fried noodle dish.
Curry Udon: Add cooked udon to a Japanese curry sauce (made with curry roux, onion, and carrot) for a thick, comforting soup.

Storage and Reheating

Cooked noodles can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, plunge them into boiling water for 30 seconds to 1 minute, then drain. For cold noodle salads, you can eat them straight from the fridge. The dipping sauce will keep for up to 1 week refrigerated. Do not freeze cooked noodles, as they will become mushy upon thawing.

Frequently Asked Questions

Which noodle is healthier, soba or udon? Soba is often considered healthier because it’s made with buckwheat, which provides more fiber and protein than regular wheat flour. However, many commercial soba noodles contain a mix of buckwheat and wheat flour, so check the label. Udon is made solely from wheat, so it’s lower in fiber.

Can I use soba instead of udon in a recipe? Yes, but the texture will be quite different. Soba is thinner and firmer, so it won’t be as soft and chewy as udon. It works well in soups and stir-fries, but the dish will have a nuttier flavor.

Why are my soba noodles sticky after cooking? This usually happens when you don’t rinse them thoroughly enough. The starch on the surface of the noodles needs to be washed off with cold water. Also, make sure you use plenty of water when boiling.

Are soba noodles gluten-free? Pure buckwheat soba is gluten-free, but most commercial soba contains wheat flour as a binder. Look for 100% buckwheat soba (jūwari soba) if you need gluten-free, and always check the package.

What is the difference between dried and fresh udon? Fresh udon is thicker, softer, and more chewy than dried. Dried udon is more convenient and has a slightly firmer texture. Both are delicious, but fresh udon is often preferred for its texture.

Can I make the dipping sauce ahead of time? Yes, the tsuyu can be made up to 3 days in advance and stored in the refrigerator. Just keep it in a sealed container and give it a stir before serving.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

Spotted an error? Tell us and we will correct it (corrections policy).