Best Sportsbook Promotions & Bonuses in December 2025 at BetMGM

Many sports betting promotions are available at the online sportsbook and on the BetMGM Sportsbook app (iOS and Android) in the United States, including a sportsbook new customer offer.

Some promotions may not be available to certain customers or have expired. 

Best Sportsbook Promotions Explained

With many available promos each day, customers can earn Bonus Bets, parlay boosts, and more in a variety of ways.

Some promotions are earned by placing certain bets, while others are available to all customers.

For new customer offers, Bonus Bets expire in seven days. One New Customer Offer only. Add’l terms. For existing customers, Bonus Bets expire in seven days. Add’l terms.

How Do Sports Betting Promotions Work?

You can view updated betting promos in the Promotions section of your BetMGM account.

Example 1: Perhaps you have a Parlay Boost Token in your account. To use the token, just add a bet to your Bet Slip, insert a stake, and use the token!

Example 2: If you have a welcome offer for Bonus Bets, you might place a $20 Bonus Bets on the Detroit Red Wings moneyline against the Chicago Blackhawks. If the Red Wings win, you win!

Types of Sportsbook Bonuses Explained

There are many different types of sportsbook bonuses:

Sign-Up Bonus

The Bonus Bets offer is BetMGM’s sign-up bonus, aka a welcome offer, New Player Offer, or welcome bonus.

New customers can can receive Bonus Bets!

Boosted Odds

An Odds Boost will increase the potential payout of your bet.

For example: The potential payout on a $100 bet with +100 odds is $200 (including stake). With a 25% odds boost to +125, the potential payout increases to $225.

Player Referral: Refer A Friend

You can earn up to $2,000 each month with Refer A Friend bonuses!

For each friend you refer to BetMGM you earn $100. And you can refer up to 20 friends per month by following these steps:

1. Invite your friend to join BetMGM via the BetMGM Refer A Friend invitation.
2. Have your friend register for a BetMGM account.
3. Once your friend creates a verified account and meets all the Refer A Friend requirements, both of you will receive the bonus.

Sports With Betting Promotions

There are many sport-specific promotions, including Same Game Parlay insurance for the NBA or MLB, and event-specific promotions, including Bet $1 to Win $100 on a golf tournament.

Pro Football

You could use Bonus Bets on pro football odds.

For example: If your first bet is $100 on a spread (-6.5 at -110 odds), the potential payout is $190.91 (including stake).

If the Bengals cover, you win $90.91 in cash!

NCAAB

You could use Same Game Parlay Insurance on college basketball odds.

For example: If your $20 five-leg Same Game Parlay misses by one leg, you could receive the stake back (up to $25) as Bonus Bets.

The Bonus Bets could then be used on other NCAAB odds or another sport.

NCAAF

There might be a Multi-Sport Parlay Boost available during the college football season.

For example: A three-leg parlay with two college football moneylines and one NFL moneyline might have odds of +400 and a potential payout of $500 (including stake) on a $100 bet.

With a Multi-Sport Parlay Boost of 25%, the odds are now +500 and the potential payout is $600 (including stake).

NHL

Perhaps there’s an Odds Boost Token available during the early weeks of the NHL regular season.

For example: A $20 bet on the Philadelphia Flyers’ moneyline of +100 would have a potential payout of $40 (including stake).

With an Odds Boost Token of 25%, the potential payout is now $45 (including stake) if the Flyers win.

MLB

If you have Bonus Bets available during the summer, you could use them on MLB odds.

For example: You could stake $25 in Bonus Bets on the New York Mets’ run line (-1.5 at +125 odds). If the Mets don’t cover, you don’t lose any money because you bet with Bonus Bets. But if the Mets cover, you win $56.25 (including stake).

How to Take Advantage of Sportsbook Promotions

You can make sportsbook promotions a key piece of your online sports betting by always watching your account for new opportunities.

If you want to build a six-leg parlay with NFL moneylines, NBA spreads, and NHL puck lines, look in your account for a Multi-Sport Parlay Boost.

The parlay boost will change the odds to give you a bigger potential payout.

If you don’t have an account yet, visit the sportsbook to activate the new customer offer and start checking your new account for more promos!

Sportsbook Bonus Terms & Conditions

Each sportsbook promo includes Terms & Conditions.

The terms might include active dates for the offer, eligibility rules, and expiration of a Bonus Bet.

Read the terms for each promo before wagering.