Pros / The Safety 1st onBoard 35 Air has all the essential safety features like energy-absorbing foam and side-impact protection.

Cons / The seat cushions are not machine washable, and you cannot install the carrier without its base.

 Verdict / The onBoard 35 is a reliable baby car seat with excellent safety features and several compatible strollers, but it is high maintenance.

Safety 1st is a well-known name in child safety for at home or on the go. The onBoard 35 Air is an older model, but this reliable baby car seat has all of the safety features you need with the convenience to fit your lifestyle. The onBoard has impressive side-impact protection, and when you're ready to transfer the carrier to the stroller, you can choose from many different Safety 1st strollers to fit your needs. Unfortunately, there are a few bothersome aspects of the car seat, like the cushions, which are not machine washable.

Like all retail car seats, the onBoard 35 Air meets all federal crash-testing requirements. It offers both energy-absorbing foam and side-impact protection to protect your child in the event of a car accident. The seat is easy to install with its LATCH connectors. You can also secure the base with your seatbelt. Unfortunately, according to the manufacturer's user manual, you cannot install the carrier independent of the base. The seat supports an infant as light as 4 pounds and as heavy as 35 pounds, or as tall as 32 inches.

The Safety 1st onBoard 35 Air is compatible with several different strollers, including the Lift LX and the SleekRide. The base is simple to install correctly, thanks to the installation instructions and the level indicators. You can adjust the carry handle to many positions. There is a decent amount of space between the handle and the canopy, so you won't have much trouble using both at the same time. Unfortunately, the cushions are not machine washable, so you'll have to spend time hand-washing the seat. If you want a car seat with machine washable cushions, you might want to consider the Evenflo Embrace

Safety 1st supports the onBoard 35 Air with a one-year warranty. You can download a new user manual if you lose yours, and if you need help with installation, there is a video tutorial on the site. Customer support representatives are available by email and phone, but we had trouble getting answers from either source.

Safety 1st onBoard 35 Air Visit Site
  • Maximum Weight Limit
  • Minimum Weight Limit
  • Maximum Height Limit
  • Number of Compatible Strollers
  1. Maximum baby weight the seat can safely handle.
  2. 6  Safety 1st onBoard
    35.0 Pounds
  3. 30.0 Pounds
  4. 35.0 Pounds
  5. 35.0 Pounds
  6. Category Average
    44.44 Pounds


The Safety 1st onBoard 35 Air is a reliable baby car seat, and even though this model is older than many of the other car seats we reviewed, it has most of the safety and convenience features we look for. It offers excellent side-impact protection and fits with several Safety 1st strollers, but it does not have machine-washable cushions, so it isn't as convenient as the best car seats.

Safety 1st onBoard 35 Air Visit Site

Specifications and Benchmarks


Weight Without Base (pounds)
Weight With Base (pounds)
Depth (inches)
Width (inches)
Height (inches)


Number of Compatible Strollers
Installation Instructions
Adjustable Harness
Stay-in-Car Base
Adjustable Carry Handle
Install Without Base
Machine-Washable Cushions


Crash Tested
Five-Point Harness
Energy-Absorbent Foam
LATCH Connectors
Level Indicators
Airplane Compliant
Side-Impact Protection
Maximum Weight Limit
35 lbs
Minimum Weight Limit
4 lbs
Maximum Height Limit
32 inches

Additional Features

Reclining Seat/Base
Center-Pull Adjustment
Adjustable Head Support
Cup Holder

Help & Support

1 Year
User Manual
Email & Phone
Local Retailer Search