Refine your search of 2 BEST Internet providers and 14 Internet plans in Diamond Bar. Enter a location to find internet service providers (ISP) in your area.
What are the best Internet providers in Diamond Bar for 2026?
Below is the list of top Internet providers in Diamond Bar for 2025 - 2026.
- Spectrum (Best Availability)
- Frontier (Cheap reliable Internet)
Best Internet Providers in Diamond Bar, CA
Charter Communications
Cable
Starting from $30/mo.
Up to 2 Gbps
- 100 Mbps - $30/mo for 1 year
- 500 Mbps - $40/mo. for 1 year
Frontier Communications
Fiber
Starting from $0/mo.
Up to 2 Gbps
- 500 Mbps - $0/mo. for 3 months
- 1 Gbps - $0/mo. for 3 months
Diamond Bar, California Internet Provider Availability
- About 100% of Diamond Bar residents have access to 1 or more provider.
- About 100% of Diamond Bar residents have access to 2 or more providers.
- About 99.96% of Diamond Bar residents have access to 3 or more providers.
Best Internet Deals in Diamond Bar, CA
Below is the list of best Internet deals available in Diamond Bar area. Compare and choose the most suitable package for you and your family. And get special discounts for ordering online!
1. Frontier 500 Mbps Internet
Frontier
Speed:
Typical download speed: 500 Mbps
Typical upload speed: 500 Mbps
Typical latency: 6 ms
Typical download speed: 500 Mbps
Typical upload speed: 500 Mbps
Typical latency: 6 ms
Prices Starting At
$0.00/mo
One-time Fees:
Installation Fee: $0.00
Early Termination Fee: Up to $100
Equipment Fee: $0.00
Installation Fee: $0.00
Early Termination Fee: Up to $100
Equipment Fee: $0.00
✅ Verified 1 month ago
2. Frontier 1 Gbps Internet
Frontier
Speed:
Typical download speed: 1000 Mbps
Typical upload speed: 1000 Mbps
Typical latency: 6 ms
Typical download speed: 1000 Mbps
Typical upload speed: 1000 Mbps
Typical latency: 6 ms
Prices Starting At
$0.00/mo
One-time Fees:
Installation Fee: $0.00
Early Termination Fee: Up to $100
Equipment Fee: $0.00
Installation Fee: $0.00
Early Termination Fee: Up to $100
Equipment Fee: $0.00
✅ Verified 1 month ago
3. Frontier 200 Mbps Internet
Frontier
Speed:
Typical download speed: 200 Mbps
Typical upload speed: 200 Mbps
Typical latency: 6 ms
Typical download speed: 200 Mbps
Typical upload speed: 200 Mbps
Typical latency: 6 ms
Prices Starting At
$19.99/mo
Reg $19.99/mo
One-time Fees:
Installation Fee: $0.00
Early Termination Fee: Up to $100
Equipment Fee: $0.00
Installation Fee: $0.00
Early Termination Fee: Up to $100
Equipment Fee: $0.00
✅ Verified 1 month ago
4. Spectrum 100 Mbps Internet
Spectrum
Speed:
Typical download speed: 113 Mbps
Typical upload speed: 104 Mbps
Typical latency: 22 ms
Typical download speed: 113 Mbps
Typical upload speed: 104 Mbps
Typical latency: 22 ms
Prices Starting At
$30.00/mo
Reg $50/mo
One-time Fees:
Installation Fee: $65 (professional install), $35 (self-install)
Late Payment Fee: Up to $8.95
Early Termination Fee: $0.00
Installation Fee: $65 (professional install), $35 (self-install)
Late Payment Fee: Up to $8.95
Early Termination Fee: $0.00
✅ Verified 1 month agoNo term contract
5. Spectrum 500 Mbps Internet
Spectrum
Speed:
Typical download speed: 572 Mbps
Typical upload speed: 525 Mbps
Typical latency: 22 ms
Typical download speed: 572 Mbps
Typical upload speed: 525 Mbps
Typical latency: 22 ms
Prices Starting At
$40.00/mo
Reg $80/mo
One-time Fees:
Installation Fee: $65 (professional install), $35 (self-install)
Late Payment Fee: Up to $8.95
Early Termination Fee: $0.00
Installation Fee: $65 (professional install), $35 (self-install)
Late Payment Fee: Up to $8.95
Early Termination Fee: $0.00
✅ Verified 1 month agoNo term contract
6. Spectrum 1 Gbps Internet
Spectrum
Speed:
Typical download speed: 1041 Mbps
Typical upload speed: 1010 Mbps
Typical latency: 22 ms
Typical download speed: 1041 Mbps
Typical upload speed: 1010 Mbps
Typical latency: 22 ms
Prices Starting At
$50.00/mo
Reg $100/mo
One-time Fees:
Installation Fee: $65 (professional install), $35 (self-install)
Late Payment Fee: Up to $8.95
Early Termination Fee: $0.00
Installation Fee: $65 (professional install), $35 (self-install)
Late Payment Fee: Up to $8.95
Early Termination Fee: $0.00
✅ Verified 1 month agoNo term contract
7. Frontier 2 Gbps Internet
Frontier
Download speeds up to:
2 Gbps
2 Gbps
Data
Unlimited
Prices Starting At
$59.99/mo
✅ Verified 1 month ago
8. Spectrum 2 Gbps Internet
Spectrum
Speed:
Typical download speed: 2269 Mbps
Typical upload speed: 1049 Mbps
Typical latency: 22 ms
Typical download speed: 2269 Mbps
Typical upload speed: 1049 Mbps
Typical latency: 22 ms
Prices Starting At
$70.00/mo
Reg $120/mo
One-time Fees:
Installation Fee: $65 (professional install), $35 (self-install)
Late Payment Fee: Up to $8.95
Early Termination Fee: $0.00
Installation Fee: $65 (professional install), $35 (self-install)
Late Payment Fee: Up to $8.95
Early Termination Fee: $0.00
✅ Verified 1 month agoNo term contract
Frequently Asked Questions
Who has best Internet service in Diamond Bar area?
There are many options for best Internet Service Provider in Diamond Bar: Spectrum,Frontier Communications,Frontier Communications. The best option for you will depend on your budget and needs.
What is the fastest internet in Diamond Bar?
Frontier Communications is the fastest Fiber Internet Service Provider in Diamond Bar. Frontier Communications delivers fast, reliable internet
service in Diamond Bar, California. Frontier Communications offers speeds up to 940 Mbps and is the best option for speed where it's available.
Who offers the cheapest internet service in Diamond Bar, CA?
The cheapest Internet service in Diamond Bar is $19.99 per month. Frontier Communications offers 200Mbps Fiber Internet for as low as $19.99 per month.
What Internet speed can I get in Diamond Bar area?
- Internet download speed in Diamond Bar ranges from 30 Mbps to 940 Mbps. Frontier Communications DSL Internet service offers up to 30 Mbps download speed and it is available to 95.5% of residents in Diamond Bar, California. Frontier Communications Fiber Internet service offers up to Mbps download speed and it is available to 67% of residents in Diamond Bar, California.
- Internet upload speed in Diamond Bar ranges from 2 Mbps to 880 Mbps. Frontier Communications DSL Internet service offers up to 2 Mbps upload speed and it is available to 95.5% of residents in Diamond Bar, California. Frontier Communications Fiber Internet service offers up to 940 Mbps download speed and it is available to 67% of residents in Diamond Bar, California.