Here Are The Best March Madness Sportsbook Promos

March Madness is one of the best times in the sporting calendar to try out some promos from a new sportsbook.

Considering there are multiple weeks of non-stop, high-stakes hardwood action, it’s no surprise sportsbooks offer a host of betting promos for first-time users throughout March Madness season!

With that in mind, TheLines.com has highlighted the top new-customer promos from industry-leading sportsbooks.

DraftKings March Madness Promo Code: Up To $1,200 in Bonuses

DraftKings Sportsbook is consistently in the upper echelon of sportsbooks thanks to its wide array of betting markets, competitive odds and user-friendly interface that builds on its long-tenured and wildly successful daily fantasy sports product.

New DraftKings customers can qualify for a three-pronged bonus: The first component is a $50 bonus bet when you make an initial deposit of at least $5; the second is $150 bonus bets with a first-time bet of at least $5; and the third is a 20% first-deposit match up to $1,000, although that has a 25x playthrough requirement.

New Customers: Bet $5+ and get $200 in Bonus Bets if it wins!

Play Now DraftKings Promo

GAMBLING PROBLEM? CALL 1-800-GAMBLER, (800) 327-5050 or visit gamblinghelplinema.org (MA). Call 877-8-HOPENY/text HOPENY (467369) (NY). Please Gamble Responsibly. 888-789-7777/visit ccpg.org (CT), or visit www.mdgamblinghelp.org (MD). 21+ and present in most states. (18+ DC/KY/NH/WY). Void in ONT/OR/NH. Eligibility restrictions apply. On behalf of Boot Hill Casino & Resort (KS). Pass-thru of per wager tax may apply in IL. 1 per new customer. Must register new account to receive reward Token. Must select Token BEFORE placing min. $5 bet to receive $200 in Bonus Bets if your bet wins. Min. -500 odds req. Token and Bonus Bets are single-use and non-withdrawable. Token expires 1/11/26. Bonus Bets expire in 7 days (168 hours). Stake removed from payout. Terms: sportsbook.draftkings.com/promos. Ends 1/4/26 at 11:59 PM ET. Sponsored by DK.

Caesars March Madness Promo Code THELINESDYW: Get 10 100% Profit Boost Tokens

Caesars Sportsbook is a well-established gaming brand that boasts a formidable presence throughout the US regulated sports betting market. It offers customers an extensive selection of betting options that includes many international events, along with an abundance of prebuilt game and prop parlays.

To claim Caesars’ promo, enter promo code THELINESDYW and receive 10 100% profit boost tokens after making an initial wager of as little as $1, whether that bet wins or loses. Tokens are good for 14 days, and the maximum wager amount they can be applied to is $25.

Bet $1, Double your Winnings on your Next 20 Wagers. Up to $25 Max Bet Per Boost

Code: TLCSPO20X Copied!

Play Now Caesars Promo

21+ New users only. Must register using eligible promo code. First bet after registration must qualify. Max. Bonus Bet: $1,000. Bonus Bet expires 14 days after receipt. Void where prohibited. See Caesars.com/promos for full terms. Gambling Problem? 1-800-GAMBLER (1-800-426-2537)

BetMGM March Madness Bonus Code THELINES: First-Bet Offer up to $1,500

BetMGM is another highly recognizable name in the gaming space and offers new and existing customers competitive odds and a robust selection of betting markets.

New customers can use promo code THELINES to receive bonus bets of up to $1,500 if their first bet loses.

Up To $1500 in Bonus Bets Paid Back if your First Bet Does Not Win

Play Now BetMGM Promo

Gambling problem? Call 1-800-GAMBLER (Available in the US) Call 877-8-HOPENY or text HOPENY (467369) (NY) Call 1-800-327-5050 (MA) 21+ only. Please Gamble Responsibly. Call 1-800-NEXT-STEP (AZ), 1-800-BETS-OFF (IA), 1-800-981-0023 (PR). Rewards are non-withdrawable bonus bets that expire in 7 days. In partnership with Kansas Crossing Casino and Hotel. See BetMGM.com for Terms. US promotional offers not available in DC, Mississippi, New York, Nevada, Ontario, or Puerto Rico.

Bet365 March Madness Bonus Code THELINES: Two Choices

Bet365 has brought its innovative sportsbook offerings stateside after building a formidable reputation internationally. It offers new customers who enter promo code THELINES a choice between two new-customer betting promos:

The first involves making a minimum deposit of $10 and placing an initial bet of $5 on a wager with -500 odds or longer, which entitles the customer to $150 in bonus bets, win or lose. The second is a first-bet insurance offer that also requires a minimum deposit of $10 and initial bet of $5. Then, if your first bet loses, you’ll get your bet amount refunded in bonus bets up to $1,000. 

Bet $5 & Get $150

Code: THELINES Copied!

Play Now Bet365 Promo

Whatever the moment. It's Never Ordinary at bet365. That's why if you sign up now you will receive $150 in Bonus Bets Win or Lose when you bet $5! Minimum $10 deposit required. Minimum odds -500 of greater. Bonus Bets wager excluded from returns. New customers only. T&CS, time limits and exclusions apply. GAMBLING PROBLEM? CALL OR TEXT 1-800-GAMBLER (AZ/CO/IL/IN/KS/KY/LA/MD/NC/NJ/OH/PA/TN/VA) or 1-800-BETS OFF (IA). 21+ (18+ KY). Must be present in AZ/CO/IA/IL/IN/KS/KY/LA (select parishes)/MD/NC/NJ/OH/PA/TN/VA.

FanDuel March Madness Promo Code: $200 In Bonus Bets If Your Bet Wins

Much like its long-time DFS rival DraftKings, FanDuel has shot to the top of the US regulated sports betting space while leveraging many of the foundational aspects of its success in that space.

Bettors who wish to try the industry-leading operator’s offerings can also participate in a betting promo that affords them $200 in bonus bets on a winning initial bet of at least $5. Bonus bets are valid from seven days of receipt.

Bet $5 Get $150 in Bonus Bets If Your Bet Wins!

Play Now FanDuel Promo

Gambling Problem? Call 1-800-GAMBLER or visit RG Help . Call 1-888-789-7777 or visit Helpline and Chat - CONNECTICUT COUNCIL (CT). Hope is here. Home or call (800) 327-5050 for 24/7 support (MA). Visit Home (MD). Call 1-877-8HOPE-NY or text HOPENY (467369) (NY). 21+ (18+ D.C.) and present in select states (for KS, in affiliation with Kansas Star Casino). First online real money wager only. $5 first deposit required. Bonus issued as nonwithdrawable bonus bets which expire 7 days after receipt. See terms at FanDuel Sportsbook

How To Claim March Madness Betting Promos

Claiming a sportsbook promo is a relatively straightforward and streamlined process. A sportsbook customer first completes the account creation process, which typically requires submitting basic personal identifying information.

An initial minimum deposit, usually $5 or $10, is also typically required before a sportsbook bonus can be claimed. Once that is completed, the sportsbook customer should enter a promo code in the appropriate field if that is required to claim the offer. However, there are other instances where a promo code is not necessary to claim the welcome bonus, but rather just a click on a hyperlink for the bonus offer does the trick.

March Madness Best Bet

Duke To Win National Championship (+340 on DraftKings Sportsbook)

While Florida is undeniably a tempting longer-shot pick — the Gators are currently as high as +750 on FanDuel Sportsbook — the Gators’ defense may ultimately not be able to hold up its end of the bargain. In contrast, the Blue Devils — the slight favorites over Auburn to win it all just a handful of days before Selection Sunday — are the epitome of a complete team, as well as a surging one. 

Duke finished regular-season play with eight consecutive wins and victories in 24 of its last 25 overall. Jon Scheyer’s squad heads into the ACC Tournament ranked No. 9 in the country in points per game (83.5) and No. 4 in points allowed (61.4). Duke also finished No. 8 in 3-point shooting (38.7%) while finishing in the top 15 in turnovers per game (9.5), further corroboration of the Blue Devils’ ability to excel in essentially every facet.

With Cooper Flagg, Kon Knueppel and Tyrese Proctor leading the way, Duke can arguably keep pace on the scoreboard with any team, while fifth-year senior Sion James is a highly efficient “fourth wheel” who drained a blistering 53.9% of his attempts, including 42.6% from behind the arc.

With depth, height and balance on their side, the Blue Devils make for a formidable bet to take home national championship hardware at the conclusion of March Madness.

watcH: march madness betting preview

You can subscribe to the audio-only version of the show on Apple, Spotify, or wherever you find your favorite podcasts.