Drinks · Updated 2026-08-01
Sonic Diet Dr. Pepper, 2026
Price, calories, and what it actually costs at 3,361 drive-ins across 38 states.
How much is the Sonic Diet Dr. Pepper?
The Sonic Diet Dr. Pepper (medium) costs $2.59 at a typical drive-in. Every Sonic is franchised and sets its own price, so it runs from $1.20 to $4.69 depending on which drive-in you pull into. It is sold at 3,361 Sonics.
From the real menu price at 3,361 drive-ins, refreshed 2026-08-01.
Price & Details
- Typical price, medium
- $2.59
- Calories
- 0
- Price range
- $1.20 to $4.69
- Most common price
- $2.49 (24% of stores)
- Category
- Drinks
- Sold at
- 3,361 drive-ins
- Sizes
- Small, Medium, Large, Route 44
What is in the Sonic Diet Dr. Pepper
Diet Dr Pepper® served cold and refreshing over SONIC's famous ice.
Compared
How the Diet Dr. Pepper Compare in Drinks
Calories per dollar is the column that says which is the better deal, not just the cheaper one.
| Item | Typical price | Calories | Cal / $ |
|---|---|---|---|
| BARQ'S Root Beer | $2.59 | 170 | 64 |
| Coca-Cola | $2.59 | 180 | 68 |
| Coca-Cola Zero | $2.59 | 0 | n/a |
| Diet Coke | $2.59 | 0 | n/a |
| Diet Dr. Pepper | $2.59 | 0 | n/a |
| Fanta Orange | $2.59 | 170 | 64 |
| Hi-C Fruit Punch | $2.59 | 190 | 72 |
| POWERADE Mountain Berry Blast | $2.59 | 80 | 30 |
Median price across every drive-in that sells it. The highlighted row is this item.
What it costs
How Much Is the Sonic Diet Dr. Pepper?
Most Sonic drive-ins charge about $2.59 for the Diet Dr. Pepper (Medium). A few go as low as $1.20 or as high as $4.69, because every Sonic is owned separately and sets its own price.
Cheapest
$1.20
the lowest anywhere
Usual price
$2.59
what most people pay
Most expensive
$4.69
the highest anywhere
Every Size
Sonic Diet Dr. Pepper Prices by Size
4 sizes, not priced proportionally. The largest is the cheapest per calorie.
Small
$2.09
Calories n/a
Medium
$2.59
Calories n/a
Large
$2.99
Calories n/a
Route 44
$3.49
Calories n/a
| Size | Typical | Range | Calories | Cal / $ |
|---|---|---|---|---|
| Small | $2.09 | $0.95 to $3.89 | 0 | n/a |
| Medium | $2.59 | $1.20 to $4.69 | 0 | n/a |
| Large | $2.99 | $1.40 to $5.19 | 0 | n/a |
| Route 44 | $3.49 | $1.65 to $6.39 | 0 | n/a |
Median price across every Sonic that sells the size. The highlighted row is the size most stores stock.
State by State
Sonic Diet Dr. Pepper Price by State
Sonic is franchised, so the price is set drive-in by drive-in rather than nationally. Across the 38 states with enough stores to average honestly, the medium runs from $2.44 in NC to $3.81 in CA, a 291% swing for identical food.
| # | State | Avg price | Range | vs national |
|---|---|---|---|---|
| 1 | NC80 stores | $2.44 | $2.19to$2.99 | -$0.21-7.9% |
| 2 | MI16 stores | $2.45 | $2.29to$3.89 | -$0.20-7.5% |
| 3 | KS131 stores | $2.48 | $2.19to$3.49 | -$0.17-6.4% |
| 4 | AR190 stores | $2.50 | $1.20to$3.49 | -$0.15-5.7% |
| 5 | MS119 stores | $2.50 | $1.89to$3.19 | -$0.15-5.7% |
| 6 | OH36 stores | $2.50 | $1.99to$2.79 | -$0.15-5.7% |
| 7 | OK258 stores | $2.50 | $1.30to$2.89 | -$0.15-5.7% |
| 8 | SC74 stores | $2.52 | $1.50to$2.99 | -$0.13-4.9% |
| 9 | TN219 stores | $2.55 | $2.19to$3.19 | -$0.10-3.8% |
| 10 | CO78 stores | $2.57 | $2.29to$2.89 | -$0.08-3% |
| 11 | UT16 stores | $2.57 | $2.19to$2.59 | -$0.08-3% |
| 12 | WY6 stores | $2.57 | $1.99to$3.09 | -$0.08-3% |
| 13 | KY67 stores | $2.58 | $1.40to$2.89 | -$0.07-2.6% |
| 14 | NM69 stores | $2.61 | $2.49to$2.99 | -$0.04-1.5% |
| 15 | TX901 stores | $2.61 | $1.25to$4.29 | -$0.04-1.5% |
| 16 | MO183 stores | $2.62 | $2.19to$2.99 | -$0.03-1.1% |
| 17 | NV23 stores | $2.63 | $2.39to$2.79 | -$0.02-0.8% |
| 18 | LA158 stores | $2.66 | $1.30to$2.99 | +$0.01+0.4% |
| 19 | AL95 stores | $2.67 | $1.89to$3.19 | +$0.02+0.8% |
| 20 | FL88 stores | $2.67 | $2.49to$2.89 | +$0.02+0.8% |
| 21 | IN26 stores | $2.68 | $2.39to$3.69 | +$0.03+1.1% |
| 22 | ID21 stores | $2.74 | $2.49to$2.99 | +$0.09+3.4% |
| 23 | GA65 stores | $2.76 | $1.70to$4.49 | +$0.11+4.2% |
| 24 | NE29 stores | $2.79 | $2.39to$4.69 | +$0.14+5.3% |
| 25 | VA50 stores | $2.80 | $2.49to$3.19 | +$0.15+5.7% |
| 26 | WV7 stores | $2.80 | $2.79to$2.89 | +$0.15+5.7% |
| 27 | AZ87 stores | $2.85 | $2.59to$3.09 | +$0.20+7.5% |
| 28 | MN5 stores | $2.89 | $2.89to$2.89 | +$0.24+9.1% |
| 29 | PA19 stores | $2.93 | $2.69to$2.99 | +$0.28+10.6% |
| 30 | WA14 stores | $2.98 | $2.89to$3.00 | +$0.33+12.5% |
| 31 | IA10 stores | $3.02 | $2.79to$4.39 | +$0.37+14% |
| 32 | MD12 stores | $3.05 | $2.89to$3.29 | +$0.40+15.1% |
| 33 | IL51 stores | $3.09 | $2.19to$3.89 | +$0.44+16.6% |
| 34 | OR13 stores | $3.09 | $3.00to$3.20 | +$0.44+16.6% |
| 35 | NY25 stores | $3.27 | $2.49to$3.79 | +$0.62+23.4% |
| 36 | NJ13 stores | $3.29 | $2.89to$3.99 | +$0.64+24.2% |
| 37 | CT7 stores | $3.38 | $2.99to$3.89 | +$0.73+27.5% |
| 38 | CA79 stores | $3.81 | $2.89to$4.39 | +$1.16+43.8% |
Ranked cheapest to dearest. Diff is against the $2.65 national average. States with fewer than five stores are left out.
Quick answers
Sonic Diet Dr. Pepper: Common Questions
How much is the Sonic Diet Dr. Pepper?
About $2.59 at a typical drive-in. It runs from $1.20 to $4.69 because each Sonic sets its own price.
What sizes does the Sonic Diet Dr. Pepper come in?
4: Small, Medium, Large, Route 44. Most drive-ins stock the Medium.
Why does the Sonic Diet Dr. Pepper cost more at some locations?
Sonic is franchised, so each owner sets the price. That is why this page shows a range, not one number.
Where is the Sonic Diet Dr. Pepper cheapest?
NC, averaging $2.44. CA is the priciest at $3.81.
Does every Sonic sell the Diet Dr. Pepper?
It is on the menu at 3,361 of the 3,357 drive-ins in our data. A few franchises drop items, so check yours.
Is the Sonic Diet Dr. Pepper half price during Happy Hour?
Yes. Happy Hour runs 2 to 4 PM every day and halves all drinks and slushes, so it drops to about $1.30.
How do I find the Sonic Diet Dr. Pepper near me?
Use the Sonic app or the store locator to find your nearest drive-in, then order it at the stall or for pickup.
Can I order the Sonic Diet Dr. Pepper on the app?
Yes. You can order it in the Sonic app for drive-in pickup or delivery, and app-only deals sometimes apply.
What is in the Sonic Diet Dr. Pepper?
Diet Dr Pepper® served cold and refreshing over SONIC's famous ice.
Keep Exploring
Also in Sonic Drinks
All Natural Lemonade
$3.29
270 CALAll natural Lemonade, made with real fruit lemons.
All Natural Lemonade
BARQ'S Root Beer
$2.59
170 CALBARQ'S® Root Beer served cold and refreshing over SONIC's famous ice.
BARQ'S Root Beer
Cherry Limeade
$2.99
240 CALOur iconic Cherry Limeade infuses fresh-squeezed lime and sweet cherry flavor and is poured over SONIC's famous ice!
Cherry Limeade
Coca-Cola
$2.59
180 CALCoca-Cola® served cold and refreshing over SONIC's famous ice.
Coca-Cola
Coca-Cola Zero
$2.59
0 CALCoca-Cola® Zero Sugar served cold and refreshing over SONIC's famous ice.
Coca-Cola Zero
Diet Coke
$2.59
0 CALDiet Coke® served cold and refreshing over SONIC's famous ice.
Diet CokePrices and calories come from Sonic's own store-level menu data across 3,357 open drive-ins in 46 states, last refreshed 2026-08-01. Sonic sets prices per franchise, so we publish the median rather than the mean, and the range beside it. This is an independent guide and is not affiliated with Sonic Drive-In.