Ontario, CA ONT to London LON Flights

Cheap plane tickets from Ontario, CA to London can start from as little as $628 (€500) when you book in advance. The average flight ticket price for Ontario, CA to London is $628 (€500) ; however, prices vary depending on the time of day and class and they tend to be more expensive on the day.

The earliest flight from Ontario, CA to London leaves at 5:05 AM. Plan your trip with the Journey Planner from Omio.

The latest flight from Ontario, CA to London leaves at 11:15 PM.

Flights from Ontario, CA to London generally leave from Los Angeles International Airport and arrive in London Heathrow Airport.Los Angeles International Airport is 1 miles (2 km) away from Ontario, CA city centre and London Heathrow Airport is 14 miles (23 km) from London city centre.

The cheapest month for a flight from Ontario, CA to London is September.

Since neither Ontario, CA nor London are in the Schengen Area, passport requirements depend on the specific immigration rules of United States and United Kingdom. Entry and visa requirements can be subject to change. For the latest information, check with your destination's embassy or consulate.

There is a time difference of 8 h between Ontario, CA and London all year round.

The best events to attend in London include:

• Notting Hill Carnival, a colorful celebration of Caribbean culture with parades and music
• London Fashion Week, a showcase of the latest trends from top designers
• The Thames Festival, a riverside festival featuring arts, music, and food
• New Year's Eve Fireworks, a spectacular fireworks display over the River Thames to ring in the new year.

The best holidays to experience in London include:

• Easter, mild spring weather and blooming flowers
• May Bank Holiday, pleasant temperatures and outdoor activities
• August Bank Holiday, summer festivities and events
• Christmas, festive decorations and holiday markets.

The best season to visit London is Spring or Summer. The best weather to explore London is during May-June or September-October.

For international flights we recommend to arrive 2.5 to 3 hours before departure. Please check the website of your departure airport if in doubt. Some airports may offer booking time slots for security checks or offer additional information on when to get there based on time of day.

Most airlines permit carry-on bags that fit within specific dimensions (e.g., 22 x 14 x 9 inches or 56 x 36 x 23 cm), including handles and wheels. Bags must fit in the overhead bin or under the seat in front of you.

Many airlines impose weight limits, commonly ranging between 7 kg (15 lbs) and 12 kg (26 lbs). Typically, passengers are allowed one carry-on bag and one personal item (for example a purse, laptop bag, or backpack). Personal items must fit under the seat in front of you. Budget Airlines (like Ryanair or Wizz Air) have stricter size and weight limits, often requiring fees for larger carry-ons. Full-Service Airlines have more lenient policies, sometimes including more spacious dimensions or higher weight limits depending on your ticket class.

The list of items prohibited on an airplane varies by country and airline, but in general, the following items are not allowed in carry-on or checked baggage: Weapons and self-defence items, sharp objects, flammable materials, explosives, toxic substances, or liquids over 100ml (except for medications and baby essentials). In checked baggage, firearms (without authorization), explosives, large lithium batteries, and hazardous chemicals are prohibited. Electronic cigarettes must be in carry-on bags, while alcohol and dry ice have restrictions. Always check with your airline for specific regulations.