When is gas cheapest on Arbitrum?
Timing barely matters on Arbitrum. The gap between its cheapest and most expensive hour is 3%, worth about $0.00020 on a typical swap. Unless you are moving unusual volume, send when it suits you and spend your attention on which chain you use rather than on what time you use it.
There is a shape to the curve — fees drift lowest around 11:00 UTC and peak around 05:00 UTC — but at this spread the difference between the best and worst hour is smaller than the variation between individual blocks. It is a pattern, not an opportunity.
Weekends are not cheaper here in any meaningful sense: the weekend mean of 0.020 gwei sits within 0% of the weekday mean. Day of week is the wrong dimension to optimise on Arbitrum — hour of day is where the variation lives.
Right now
Arbitrum is at 0.020 gwei — about its six-month median.
Every hour, ranked
Mean gas price for each hour of the day (UTC), averaged across all days over six months.
| # | Hour (UTC) | Mean fee | vs median | Swap cost |
|---|---|---|---|---|
| 1 | 00:00 UTC | 0.020 gwei | 0% | $0.0070 |
| 2 | 04:00 UTC | 0.020 gwei | 0% | $0.0070 |
| 3 | 01:00 UTC | 0.020 gwei | 0% | $0.0070 |
| 4 | 03:00 UTC | 0.020 gwei | 0% | $0.0070 |
| 5 | 09:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 6 | 07:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 7 | 08:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 8 | 06:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 9 | 10:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 10 | 11:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 11 | 17:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 12 | 22:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 13 | 02:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 14 | 20:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 15 | 13:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 16 | 18:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 17 | 23:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 18 | 19:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 19 | 16:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 20 | 05:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 21 | 12:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 22 | 21:00 UTC | 0.020 gwei | +0% | $0.0070 |
| 23 | 14:00 UTC | 0.020 gwei | +1% | $0.0070 |
| 24 | 15:00 UTC | 0.020 gwei | +1% | $0.0070 |
What it costs
At the cheapest hour versus the most expensive, priced at $2313.42 per ETH.
| Transaction | Gas units | Cheapest hour | Most expensive |
|---|---|---|---|
| Send native token | 21,000 | $0.00097 | $0.0010 |
| Send an ERC-20 token | 65,000 | $0.0030 | $0.0031 |
| Swap on a DEX | 150,000 | $0.0070 | $0.0072 |
Gas units are typical values, not measurements — real usage varies with the contract and with state. L2 execution fee only — excludes the L1 data fee, which is usually the larger share of what you pay.
Six months, by day and hour
Each cell combines about 7,681 readings from 25–26 occurrences of that hour. Green is cheaper, red dearer.
Questions
When is gas cheapest on Arbitrum?
Averaged over six months, the cheapest single hour is Saturday at 11:00 UTC, at 0.020 gwei. The broader cheap window runs 00:00 UTC to 02:00 UTC.
How much can timing actually save on Arbitrum?
The most expensive hour runs 0.021 gwei against 0.020 gwei at the cheapest. On a 150,000-gas swap that is $0.0072 against $0.0070.
What data is this based on?
1,290,338 block observations for Arbitrum between 2026-04-30 and 2026-10-27, sampled every 12 seconds and averaged by day and hour: each of the 168 cells combines about 7,681 readings from 25–26 occurrences of that hour. All hours are UTC.
Why do Arbitrum fees look so low here?
Arbitrum is a rollup. The fee measured on this page is the L2 execution fee only; settling the transaction on Ethereum adds an L1 data fee that is usually the larger share of what you actually pay and is not included in these figures.