Houston Astros @ Seattle Mariners
Tue Sep 22, 9:41 PM ET
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Odds from the latest scan: September 21, 4:15 PM ET. Live odds for this game.
DraftKings pays the most on Houston Astros at +124, and Novig pays the most on Seattle Mariners at -135. Across the 6 books pricing this game the best and worst numbers are $8.00 apart on a $100 bet.
Best MLB price on Houston Astros vs Seattle Mariners, compared across every major US sportsbook plus Kalshi, Polymarket US, ProphetX and Novig. Tue Sep 22, 9:41 PM ET.
Games starting within 24 hours refresh every minute; later games every 30 minutes and every hour as kickoff approaches during the beta; the free board refreshes hourly.
Moneyline Line HistoryHouston Astros +124 DraftKings·Seattle Mariners -135 Novig
Every Book's Moneyline
| Book | Houston Astros | Seattle Mariners |
|---|---|---|
| Novig | +122 | -135 |
| KalshiShown for reference, never counted as the best price. | +118 | -136 |
| Polymarket US | +116 | -139 |
| FliffShown for reference, never counted as the best price. | +115 | -140 |
| LowVigShown for reference, never counted as the best price. | +127 | -140 |
| BetOnlineShown for reference, never counted as the best price. | +127 | -140 |
| FanDuel | +120 | -142 |
| BovadaShown for reference, never counted as the best price. | +119 | -142 |
| BetMGM | +120 | -145 |
| Hard Rock Bet | +120 | -145 |
| DraftKings | +124 | -150 |
Spread Line HistoryHouston Astros +1.5 (-169) DraftKings·Seattle Mariners -1.5 (+146) FanDuel
Total Line HistoryOver 7.5 (-104) Novig·Under 7.5 (+100) FanDuel
About These Charts
Player Props
11 books priced this game. Prediction market prices include trading fees wherever a fee applies, so they are directly comparable to sportsbook lines.
On Houston Astros vs Seattle Mariners, the best available price is not the same at every book. One sportsbook might post a side at -110 while another has it at -102, and taking the better number is the one edge you fully control. The Odds Gap scans every major US sportsbook plus the federally regulated prediction markets and flags where the best price sits on each side of this MLB matchup.
How to read these Houston Astros vs Seattle Mariners odds
The cards above show the best moneyline price on each side and which book has it. The spread line shows Seattle Mariners at the market's consensus number, priced at the best odds among books quoting it. The total shows the Over at the consensus number. For every book's price on every market, open the game in the Line Shop.
What the Price Gap Is Worth
Across the 6 books quoting this side, the best price is +124 at DraftKings and the worst is +116 at Polymarket US. Same bet, same outcome, $8.00 difference in profit on a $100 stake. Nothing about the wager changes, only where you place it.
- Houston Astros: best +124 (DraftKings), worst +116 (Polymarket US)
- Seattle Mariners: best -135 (Novig), worst -150 (DraftKings)
Houston Astros vs Seattle Mariners Odds: Common Questions
Who has the best odds on Houston Astros vs Seattle Mariners?
At the latest scan DraftKings pays the most on Houston Astros at +124, and Novig pays the most on Seattle Mariners at -135. Those are two different books more often than not, and the best number moves as books reprice, so check the table on this page before you bet rather than assuming one book wins both sides.
How much does the price differ between sportsbooks on this game?
Right now 6 books price this side, and the spread between the best and worst of them is +124 at DraftKings versus +116 at Polymarket US. On a $100 bet that is $8.00 more in your pocket for the same wager, won or lost the same way. That difference is the entire reason this page exists.
What is the spread and total for Houston Astros vs Seattle Mariners?
The consensus spread is -1.5 on Seattle Mariners with the best juice at +146 (FanDuel), and the consensus total is 7.5 with the best Over price at -104 (Novig). Consensus means the line most books agree on; the flagged price is the best juice available at that same number.
How often do these MLB odds update?
The free board rescans every hour from 7am to 1am ET; Live Beta, free with an email signup during the beta, refreshes every minute. This page was last scanned September 21, 4:15 PM ET, and that timestamp is shown above the table.
Does The Odds Gap pick a side on Houston Astros vs Seattle Mariners?
No. There is no model, no projection, and no lean anywhere on this site. We show which book pays the most on a bet you have already decided to make. Math, not picks.
The Rest Of This MLB Slate
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