Cheapest Grocery Delivery Service: Instacart, Walmart, Amazon, and Target Compared

Overview

Most grocery delivery comparisons go wrong in the same way: they focus on one visible price and ignore the rest. A shopper may compare the shelf price of milk or eggs across apps, but the final checkout total can shift because of service fees, delivery charges, small-order surcharges, retailer markups, membership costs, or digital coupons that only apply in one app.

That is why the cheapest grocery delivery service is best treated as a repeatable calculation rather than a fixed ranking. In practical terms, you want to compare four things across Instacart, Walmart, Amazon, and Target:

• Item subtotal: the actual basket price before taxes, fees, tips, and discounts.
• Delivery-related costs: delivery fees, service fees, rush fees, and any extra charges tied to smaller baskets or faster time slots.
• Membership effect: whether a monthly or annual plan lowers the effective cost of each order enough to matter.
• Discount effect: promo codes, first-order offers, digital coupons, store-brand substitutions, or cashback tools that reduce the final price.

Used this way, the comparison becomes more useful than a one-time list. You can return to it when your shopping habits change, when one retailer offers a stronger coupon, or when delivery pricing moves. For many households, the cheapest option for a small urgent order is not the cheapest option for a large weekly restock.

There is also a second question hidden inside the main one: are you trying to minimize this order, or are you trying to minimize your average monthly grocery delivery cost? Those are different goals. A service with a free trial or one-time promo may win today, while another becomes cheaper over a month because it fits your order size and frequency better.

If you already compare everyday essentials across marketplaces, our Amazon vs Walmart Prices: Where Everyday Household Essentials Are Cheaper guide is a useful companion read. Grocery delivery works the same way, but with more fee layers and more timing pressure.

How to estimate

The simplest way to compare Instacart vs Walmart grocery delivery, Amazon grocery delivery, and Target grocery delivery cost is to build one sample basket and run the same math for each service.

Use this basic formula:

Total order cost = item subtotal + delivery/service fees + membership cost per order + taxes and tip - coupons and credits

The key is to calculate using the same basket and the same assumptions. Do not compare a 12-item cart on one app with a 25-item cart on another. Create one realistic list based on what you actually buy.

Step 1: Build a consistent basket.
Choose 15 to 30 grocery items you buy regularly. Include a mix of pantry staples, refrigerated basics, produce, and household essentials if those are normally part of your grocery order. If you often buy store brands, make sure your comparison basket includes store-brand equivalents where available.

Step 2: Check item-level pricing.
For each service, note the pre-fee item subtotal. This is the most important number because a service with a lower delivery fee can still end up more expensive if its basket pricing is higher across many items.

Step 3: Add order-level fees.
Look for delivery charges, service fees, priority fees, and any minimum-order related costs. If your order is small, this is often the category that changes the ranking.

Step 4: Spread membership cost across your expected orders.
If you pay for a plan, divide that monthly or annual cost by the number of grocery orders you expect to place. A membership can make a service look expensive if you place one order per month, but very reasonable if you place six.

Step 5: Apply discounts carefully.
Only count discounts you can actually use. A coupon code that works once is different from a recurring member perk. Likewise, first-order offers should not be treated as a permanent savings rate.

Step 6: Decide how to handle tipping.
For a clean comparison, treat tip as a separate line. If all services in your comparison involve the same tipping assumption, you can either include it in each total or compare pre-tip totals and note that tip will be added. What matters is consistency.

Step 7: Compare per-order and per-month totals.
A one-order comparison helps you answer “What is the best grocery delivery deal right now?” A monthly comparison helps answer “Which service is cheapest for my routine?”

For returning shoppers, this method also works well with a simple spreadsheet. Make one row for each service and one column each for subtotal, fees, membership allocation, discounts, tax estimate, tip, and final total. Once built, it only takes a few minutes to update.

Inputs and assumptions

To make a grocery delivery comparison useful, you need to be clear about the inputs. Many of the biggest pricing differences are not about groceries themselves but about the assumptions behind the order.

1. Basket size

Small baskets behave differently from large ones. A service that feels expensive on a $25 top-up order may become competitive on a $120 weekly order because flat fees are spread across more items. If you place both kinds of orders, run both scenarios.

2. Store brand vs national brand

If your usual habit is buying store brands, compare store brands. If you prefer specific national brands, use those instead. A comparison becomes misleading when one cart uses premium versions and another uses budget substitutes. This matters especially when deciding where to buy cheapest for routine staples.

3. Membership status

Membership often changes the economics more than shoppers expect. But only include it if you are likely to keep using the service. A free trial, promotional membership, or bundled benefit may lower your short-term cost, while a full-price membership only pays off if your order frequency is high enough.

A useful formula is:

Effective membership cost per order = monthly or annual membership cost ÷ expected number of orders during that period

If that number is low, the membership may be worth including. If it is high, compare the service both with and without it.

4. Delivery speed

Fast delivery often costs more. If one app is showing a rush or priority option while another defaults to a standard time window, you are not comparing like with like. Choose a similar delivery speed for each service before judging which has the best online discounts overall.

5. Minimum order thresholds

Many grocery delivery platforms become cheaper only once your cart reaches a certain size. If your basket is below a minimum, fees can jump. This is one reason small convenience orders often look poor value compared with larger, planned restocks.

6. Item availability and substitutions

A cheap cart can become a more expensive cart if out-of-stock items are substituted with pricier alternatives. When possible, set the same substitution preferences across services. If your household is price-sensitive, choosing “refund instead of substitute” may protect your budget better.

7. Promo codes and credits

Verified coupons matter, but they should be sorted into categories:

• One-time new customer offers
• Store-specific digital coupons
• Membership-linked perks
• Referral credits or account credits
• Seasonal promotions and limited time sale offers

For a fair long-term comparison, separate “introductory savings” from “repeatable savings.” This is especially important if you are looking for a coupon code that works right now but also want to know your likely cost next month.

8. Geography

Local store access changes everything. One service may have excellent pricing in an area with strong store coverage and weaker pricing somewhere else. Because of that, evergreen grocery delivery advice should focus on method, not a universal winner.

9. Frequency of shopping

Weekly family shops, small city-apartment replenishment orders, and occasional bulk pantry runs all create different cost profiles. The best grocery delivery deal for one shopper may not be the best for another simply because order cadence is different.

If you enjoy comparison shopping beyond groceries, our roundups on Flash Sale Sites Compared: Woot, Zulily Alternatives, and Daily Deal Stores and Best Kitchen Appliance Deals: Air Fryers, Blenders, and Coffee Makers Worth Buying use the same principle: total value matters more than a single headline discount.

Worked examples

The examples below are frameworks, not current price claims. Use them to test which service is cheapest for your own shopping pattern.

Example 1: Small emergency order

Imagine you need 8 to 10 items for tonight: milk, bread, fruit, pasta, sauce, and a few basics. This is where small-order economics matter most.

What usually drives cost here:

• Delivery minimums
• Small-order fees
• Priority delivery surcharges
• Lack of coupon eligibility on low subtotals

How to compare:
Create the same mini basket on Instacart, Walmart, Amazon, and Target. Use the nearest equivalent delivery window on each. Then compare pre-tip total.

What often happens:
The service with the lowest item subtotal may lose after fees. A membership can matter a lot in this scenario because per-order charges are a larger share of the total. If you only place small orders occasionally, however, a paid membership may still not be worth it overall.

Example 2: Standard weekly grocery run

Now imagine a fuller basket: produce, dairy, proteins, snacks, pantry staples, paper goods, and household cleaning items.

What usually drives cost here:

• Basket-wide item pricing differences
• Store-brand availability
• Threshold-based fee reductions
• Multi-item digital coupon offers

How to compare:
Use a 20- to 30-item cart based on your actual weekly needs. Keep brand choices consistent. Add any repeatable discounts you would normally use, then compare total delivered cost.

What often happens:
The winner is usually the service with the strongest combination of competitive basket pricing and manageable fees, not necessarily the one advertising the best promo. Large orders are where recurring value becomes clearer.

Example 3: Membership decision

Suppose you are deciding whether a grocery delivery membership lowers your monthly spending.

Method:

1. Estimate how many orders you place in a month.
2. Divide membership cost by that number.
3. Add that effective per-order membership cost to your comparison.
4. Compare with the non-member version of the same order.

What to watch:
If your usage is inconsistent, the membership may only look good in high-order months. If it is bundled with another service you already value, the grocery portion may effectively cost you less, but only count savings you personally use.

Example 4: Promo-driven first order

Many shoppers searching for the cheapest grocery delivery service really mean “What is the cheapest first order I can place this week?” That is a valid question, but it is not the same as a long-term value comparison.

Method:

• Compare all available first-order discounts separately from standard pricing.
• Check minimum purchase thresholds and excluded categories.
• Calculate final cost after promo but before assuming future savings.

Best practice:
Track two totals: intro order total and repeat order total. This keeps a strong introductory deal from distorting your ongoing comparison.

When to recalculate

This topic is worth revisiting because grocery delivery pricing changes in small but meaningful ways. You do not need to rebuild your comparison every week, but you should update it whenever one of these triggers appears:

• Your order size changes. A new household schedule, meal plan, or budget can shift the cheapest option.
• You start or cancel a membership. Membership allocation changes your real per-order cost.
• A favorite store changes coupon strategy. Digital coupon availability can materially alter basket totals.
• You move or change delivery area. Store access and local fee structures may differ.
• You switch between small urgent orders and planned weekly shops. The fee profile changes enough to justify a fresh comparison.
• You see a major seasonal offer. Holiday shopping deals, back-to-school periods, and event-based retailer promotions can create short-term savings worth testing.

A practical routine is to keep one comparison sheet with three saved baskets:

1. Emergency basket for small same-day needs
2. Weekly basket for normal grocery shopping
3. Stock-up basket for pantry and household essentials

Then, when you spot new working promo codes or delivery changes, update only those three carts. In a few minutes, you will know whether Instacart vs Walmart grocery delivery, Amazon grocery delivery comparison, or Target grocery delivery cost looks best for your current pattern.

To make this even more practical:

• Screenshot totals before checkout so you can compare later.
• Note whether discounts are one-time or repeatable.
• Keep tip assumptions consistent.
• Track substitutions on past orders, since they affect true cost over time.
• Review every month if you order often, or every season if you order less frequently.

The bottom line is simple: the cheapest grocery delivery service is the one with the lowest all-in cost for your basket, your timing, and your order frequency. Not the lowest advertised fee, not the loudest deal banner, and not the best one-time code in isolation. If you treat grocery delivery as a price comparison problem instead of a brand loyalty decision, you will usually save more.

For readers building a broader savings system, you may also like our guides to Black Friday Price Tracker: Categories Worth Waiting For vs Buying Early and Memorial Day Sales Guide: What Usually Gets the Biggest Discounts. The shopping principle is the same in every category: compare total cost, understand timing, and only count discounts you can actually use.