Sun, Sand, and Savings: Amazon Prime Day Swimsuits Under $40 You’ll Love

With a V-neck top and adjustable straps, this bikini pairs perfectly with high-waisted, slightly cheeky bottoms for a flattering fit.

Available in extended sizes and 50 colors and prints, one reviewer raved, “It really holds in your tummy and makes your boobs look great—I highly recommend!”

• Size Range: Small – XXL

This one-piece strikes the perfect balance between flirty and functional with front and back cutouts plus a bandeau-style bust.

The adjustable straps let you switch up the look, and one reviewer raved, “Fits as expected, and I love how I can cross the straps in the front or back for a different vibe!”

• Size Range: Small – XL

This one-piece swimsuit features adjustable ruched detailing for optimal tummy control, along with a high-rise leg cut that’s sure to have all eyes on you as you have fun in the sun.

It includes removable pads & adjustable spaghetti shoulder straps, and it’s available in a wide array of colors & patterns.

• Size Range: Small – 3XL

This two-piece proves that simple can be stylish.

With a bandeau top, removable straps, and high-waisted bottom, it has 13,000 five-star reviews, with one shopper saying, “I got so many compliments and was so comfortable, I forgot I was in a bikini.”

• Size Range: Small to 3XL

Get the best of both worlds with this best-selling one-piece.

Featuring a midriff cutout, tummy control bodice, and full-coverage bottoms, it has adjustable criss-cross straps, self-tie details for the perfect fit, and fixed padded cups for shape—one reviewer even said, “This suit is amazing. The fabric is sturdy, great tummy control, and the girls fit like a glove.”

• Size Range: X-Small to 22 Plus

You can’t go wrong with a classic string bikini like this one, offering full control over the fit of it. With a triangle top and low-rise cheeky bottoms, it’s a timeless style that one reviewer even called “timeless.”

• Size Range: X-Small to XXL

The high-waisted ruched bottoms and flowy top make this two-piece ideal for those seeking moderate coverage while still keeping it stylish.

Adjustable straps ensure a perfect fit, and one reviewer said, “It’s very well made and super flattering! These high-waisted bottoms made me feel confident, especially with extra weight in my belly area.”

• Size Range: X-Small to XXL

With its vintage-inspired design, this bikini not only looks good, but it also delivers tons of support.

The top has push-up padding for lift, and self-tie halter, and two back straps that are fully adjustable for the perfect fit. That’s probably why it’s garnered so many 5-star ratings.

• Size Range: XX-Small – 22 Plus

This two-piece has major sporty vibes with its halter-style top for full coverage (and sun protection) and simple low-rise bottoms with medium coverage.

Available in 30 colors and prints, one reviewer said, “I just bought this bikini and will be back for another—top provides full coverage for swimming and diving, plus it’s super flattering!”

• Size Range: X-Small to XXL

This scoop-neck one-piece is a total classic, offering full coverage that’s perfect for swimming or lounging.

The crisscross back adds a fun touch, and with tons of colors, prints, and extended sizes, one reviewer raved, “I bought this for water aerobics—it stays in place, fits well, and everyone in class wants one!”

• Size Range: Small to 20 Plus

This bikini is seriously cute, featuring a sweetheart neckline and adjustable crisscross straps that one reviewer said “has great support and is super comfortable and soft.”

Paired with a cheeky low-cut bottom, it comes in tons of fun colors and patterns to match your vibe.

• Size Range: X-Small to XXL

This one-shoulder one-piece is effortlessly classy with a ruched bodice, tummy control, and plenty of coverage.

Available in extended sizes and tons of colors, one reviewer raved, “I want one in every color! It stays in place, sucks you in where it matters, and never needs adjusting.”

• Size Range: XX-Small to 22 Plus

This flirty two-piece features a triangle top with adjustable straps, a keyhole cutout, and a self-tie detail, paired with a cheeky bottom.

Available in 18 colors and dreamy floral prints, one reviewer raved, “This bikini is so cute for the beach! It fits true to size and is made of good stretchy material!”

• Size Range: X-Small to XL

Steal the spotlight in this stunning cutout one-piece swimsuit.

With daring front cutouts and wrap tie details, it adds a seductive edge to your beach look, while the plunging low back design amps up the sultry appeal.

• Size Range: XS – XXL

With a ruched bodice, full-coverage bottoms, and ruffle details along the bust, this one-piece is equal parts stylish and flattering.

Made from a stretchy, quick-drying material with adjustable straps, one reviewer said, “Fits true to size, comfortable with a little tummy control (but not so tight that it makes bulges), and good support on top.”

• Size Range: Small to XXL

This sporty-meets-sexy two-piece features an adjustable scoop-neck top and high-waisted bottoms with a cheeky ’90s cut.

Available in 39 colors and prints, one reviewer gushed, “It’s so flattering and still shows my curves!!”

• Size Range: Small to XXL