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Cheap flights from Ontario to United States
Easily compare round-trip flights from Ontario to United States
Below you can see the best fares for your round-trip flight route over the next three months. All fares were found on momondo this week. Browse the quickest and cheapest flights from Ontario to United States by changing tabs
Quickest
Cheapest
United Airlines
24 Jan
9:00 pm
ONT
Ontario airport
2h 15m
DEN
12:15 am
+1
Denver Intl airport
30 Jan
10:00 pm
DEN
Denver Intl airport
2h 26m
ONT
11:26 pm
Ontario airport
97 USD
Alaska Airlines
08 Jan
9:00 pm
ONT
Ontario airport
2h 45m
SEA
11:45 pm
Seattle/Tacoma Intl airport
14 Jan
9:00 pm
SEA
Seattle/Tacoma Intl airport
2h 35m
ONT
11:35 pm
Ontario airport
117 USD
United Airlines
04 Mar
9:00 pm
ONT
Ontario airport
4h 32m
1 Stop
SEA
1:32 am
+1
Seattle/Tacoma Intl airport
07 Mar
9:00 pm
SEA
Seattle/Tacoma Intl airport
2h 35m
ONT
11:35 pm
Ontario airport
126 USD
Alaska Airlines
07 Jan
9:00 pm
ONT
Ontario airport
2h 20m
PDX
11:20 pm
Portland airport
09 Jan
9:00 pm
PDX
Portland airport
2h 16m
ONT
11:16 pm
Ontario airport
147 USD
Frontier
19 Dec
9:00 pm
ONT
Ontario airport
2h 25m
DEN
12:25 am
+1
Denver Intl airport
27 Dec
10:00 pm
DEN
Denver Intl airport
2h 26m
ONT
11:26 pm
Ontario airport
149 USD
Frontier
11 Mar
9:00 pm
ONT
Ontario airport
2h 21m
DEN
12:21 am
+1
Denver Intl airport
18 Mar
10:00 pm
DEN
Denver Intl airport
2h 28m
ONT
11:28 pm
Ontario airport
151 USD
Alaska Airlines
07 Jan
9:00 pm
ONT
Ontario airport
2h 20m
PDX
11:20 pm
Portland airport
09 Jan
9:00 pm
PDX
Portland airport
2h 16m
ONT
11:16 pm
Ontario airport
147 USD
United Airlines
02 Feb
9:00 pm
ONT
Ontario airport
2h 15m
DEN
12:15 am
+1
Denver Intl airport
09 Feb
10:00 pm
DEN
Denver Intl airport
2h 25m
ONT
11:25 pm
Ontario airport
159 USD
United Airlines
24 Jan
9:00 pm
ONT
Ontario airport
2h 15m
DEN
12:15 am
+1
Denver Intl airport
30 Jan
10:00 pm
DEN
Denver Intl airport
2h 26m
ONT
11:26 pm
Ontario airport
97 USD
Frontier
11 Mar
9:00 pm
ONT
Ontario airport
2h 21m
DEN
12:21 am
+1
Denver Intl airport
18 Mar
10:00 pm
DEN
Denver Intl airport
2h 28m
ONT
11:28 pm
Ontario airport
151 USD
Frontier
19 Dec
9:00 pm
ONT
Ontario airport
2h 25m
DEN
12:25 am
+1
Denver Intl airport
27 Dec
10:00 pm
DEN
Denver Intl airport
2h 26m
ONT
11:26 pm
Ontario airport
149 USD
Major Airline
19 Dec
9:00 pm
ONT
Ontario airport
2h 25m
DEN
12:25 am
+1
Denver Intl airport
27 Dec
10:00 pm
DEN
Denver Intl airport
2h 26m
ONT
11:26 pm
Ontario airport
168 USD
Alternative routes for Ontario to United States
Compare alternative flights to and from nearby airports and cities to discover the best prices and most convenient flight times
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Flights to other cities in United States
Lost the lust for United States? Check out some flights to other cities in United States
Round-trip flights to other destinations
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*Flight prices to United States are based on prices for economy tickets found by momondo users during searches within the last 72 hours. These prices may no longer be available.