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Seattle to Ontario flight ticket price

Compare live prices for SEA to ONT. Use the search panel to change origin, destination, passengers, cabin and trip type instantly.
SEA → ONT Approx. 1540.37 km 11 May 2026 Live inventory
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Showing 25 of 172 live flights
Frontier Airlines
F9-1176
19:50
05/11/2026
SEA
Seattle Tacoma International Airport
14h 15m
1 Stop
⏱ DEN · 8h 47mDEN Airport
10:05
05/12/2026
+1
ONT
Ontario International Airport
₹9,456
per person
✕ Non-refundable
Frontier Airlines
F9-2408
11:37
05/11/2026
SEA
Seattle Tacoma International Airport
7h 55m
1 Stop
⏱ LAS · 4h 2mLAS Airport
19:32
05/11/2026
ONT
Ontario International Airport
₹9,456
per person
✕ Non-refundable
Frontier Airlines
F9-1176
19:50
05/11/2026
SEA
Seattle Tacoma International Airport
27h 59m
1 Stop
⏱ DEN · 22h 35mDEN Airport
23:49
05/12/2026
+1
ONT
Ontario International Airport
₹11,455
per person
✕ Non-refundable
Southwest Airlines
WN-2650
12:55
05/11/2026
SEA
Seattle Tacoma International Airport
10h 10m
1 Stop
⏱ LAS · 6h 35mLAS Airport
23:05
05/11/2026
ONT
Ontario International Airport
₹14,345
per person
✕ Non-refundable
Southwest Airlines
WN-431
06:15
05/11/2026
SEA
Seattle Tacoma International Airport
5h 5m
1 Stop
⏱ LAS · 1h 35mLAS Airport
11:20
05/11/2026
ONT
Ontario International Airport
₹14,345
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-1310
05:30
05/11/2026
SEA
Seattle Tacoma International Airport
7h 40m
1 Stop
⏱ DEN · 2h 45mDEN Airport
13:10
05/11/2026
ONT
Ontario International Airport
₹14,345
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-2650
12:55
05/11/2026
SEA
Seattle Tacoma International Airport
7h 45m
1 Stop
⏱ LAS · 4h 5mLAS Airport
20:40
05/11/2026
ONT
Ontario International Airport
₹14,345
per person
✕ Non-refundable5 fare options
Delta Air Lines
DL-1128
05:30
05/11/2026
SEA
Seattle Tacoma International Airport
6h 23m
1 Stop
⏱ SLC · 2h 17mSLC Airport
11:53
05/11/2026
LGB
Ontario International Airport
₹15,397
per person
✕ Non-refundable
Southwest Airlines
WN-2862
05:00
05/11/2026
SEA
Seattle Tacoma International Airport
4h 50m
1 Stop
⏱ SMF · 1h 40mSMF Airport
09:50
05/11/2026
BUR
Ontario International Airport
₹15,573
per person
✓ Refundable8 fare options
Southwest Airlines
WN-431
06:15
05/11/2026
SEA
Seattle Tacoma International Airport
5h 25m
1 Stop
⏱ LAS · 1h 45mLAS Airport
11:40
05/11/2026
BUR
Ontario International Airport
₹15,573
per person
✓ Refundable8 fare options
United Airlines
UA-2121
08:38
05/11/2026
SEA
Seattle Tacoma International Airport
5h 18m
1 Stop
⏱ SFO · 1h 33mSFO Airport
13:56
05/11/2026
BUR
Ontario International Airport
₹16,138
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-431
06:15
05/11/2026
SEA
Seattle Tacoma International Airport
9h 35m
1 Stop
⏱ LAS · 6h 0mLAS Airport
15:50
05/11/2026
ONT
Ontario International Airport
₹16,230
per person
✕ Non-refundable
Southwest Airlines
WN-3588
07:20
05/11/2026
SEA
Seattle Tacoma International Airport
10h 0m
1 Stop
⏱ OAK · 6h 25mOAK Airport
17:20
05/11/2026
ONT
Ontario International Airport
₹16,230
per person
✕ Non-refundable
United Airlines
UA-499
07:08
05/11/2026
SEA
Seattle Tacoma International Airport
6h 48m
1 Stop
⏱ SFO · 3h 4mSFO Airport
13:56
05/11/2026
BUR
Ontario International Airport
₹16,231
per person
✓ Refundable🔥 Last 5 seats4 fare options
Southwest Airlines
WN-3936
06:30
05/11/2026
SEA
Seattle Tacoma International Airport
9h 55m
1 Stop
⏱ PHX · 5h 55mPHX Airport
16:25
05/11/2026
ONT
Ontario International Airport
₹16,231
per person
✕ Non-refundable
Southwest Airlines
WN-4204
11:40
05/11/2026
SEA
Seattle Tacoma International Airport
5h 10m
1 Stop
⏱ SMF · 1h 45mSMF Airport
16:50
05/11/2026
ONT
Ontario International Airport
₹16,231
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-4204
11:40
05/11/2026
SEA
Seattle Tacoma International Airport
8h 5m
1 Stop
⏱ SMF · 4h 35mSMF Airport
19:45
05/11/2026
ONT
Ontario International Airport
₹16,231
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-3588
07:20
05/11/2026
SEA
Seattle Tacoma International Airport
4h 50m
1 Stop
⏱ OAK · 1h 15mOAK Airport
12:10
05/11/2026
ONT
Ontario International Airport
₹17,051
per person
✕ Non-refundable9 fare options
Southwest Airlines
WN-4200
18:15
05/11/2026
SEA
Seattle Tacoma International Airport
4h 50m
1 Stop
⏱ PHX · 0h 45mPHX Airport
23:05
05/11/2026
ONT
Ontario International Airport
₹17,051
per person
✕ Non-refundable9 fare options
Southwest Airlines
WN-2862
05:00
05/11/2026
SEA
Seattle Tacoma International Airport
5h 25m
1 Stop
⏱ SMF · 2h 10mSMF Airport
10:25
05/11/2026
ONT
Ontario International Airport
₹17,051
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-2615
17:35
05/11/2026
SEA
Seattle Tacoma International Airport
5h 30m
1 Stop
⏱ LAS · 1h 55mLAS Airport
23:05
05/11/2026
ONT
Ontario International Airport
₹17,051
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-2862
05:00
05/11/2026
SEA
Seattle Tacoma International Airport
7h 55m
1 Stop
⏱ SMF · 4h 40mSMF Airport
12:55
05/11/2026
ONT
Ontario International Airport
₹17,577
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-4204
11:40
05/11/2026
SEA
Seattle Tacoma International Airport
3h 55m
Non-stop
15:35
05/11/2026
BUR
Ontario International Airport
₹17,979
per person
✕ Non-refundable
Southwest Airlines
WN-4204
11:40
05/11/2026
SEA
Seattle Tacoma International Airport
3h 55m
1 Stop
⏱ SMF · 0h 35mSMF Airport
15:35
05/11/2026
BUR
Ontario International Airport
₹18,131
per person
✓ Refundable8 fare options
Southwest Airlines
WN-431
06:15
05/11/2026
SEA
Seattle Tacoma International Airport
11h 55m
2 Stops
⏱ SNA · 1h 30mSNA Airport⏱ SJC · 3h 30mSJC Airport
18:10
05/11/2026
ONT
Ontario International Airport
₹18,224
per person
✕ Non-refundable4 fare options
😕 No flights match your filters.
Seattle (SEA)
📍 Seattle Tacoma International Airport
🌍 United States
🕐 GMT -8
📐 Latitude: 47.449001
📐 Longitude: -122.308998
Ontario (ONT)
📍 Ontario International Airport
🌍 United States
🕐 GMT -8
📐 Latitude: 34.055999755859375
📐 Longitude: -117.60099792480469

✈ Distance: Seattle,USA to Ontario,USA1540.37 km

📅 Results on this page are loaded for 11 May 2026. Click View all flights for the complete live search.

Seattle to Ontario — what to expect when booking

The SEA–ONT route is served by multiple carriers throughout the year. Fares on this route can move quickly — a price available now may not be there 30 minutes later.

If your dates are flexible, try shifting your departure by a day or two using the date strip above. Mid-week departures often show lower base fares compared to weekend starts on many routes.

The distance between Seattle,USA and Ontario,USA is approximately 1540.37 km.

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❓ Frequently asked questions — Seattle to Ontario flights

Generally yes — fares on most routes are most competitive around 4–6 weeks before departure. Booking earlier usually means better availability and a lower base fare when your dates are fixed.

The straight-line distance between Seattle,USA (SEA) and Ontario,USA (ONT) is approximately 1540.37 km. Actual flying distance may vary slightly depending on routing.

Non-stop availability on this route varies by airline schedule and season. Use the filters below to quickly check whether direct options are available on your selected date.

Mid-week departures often show lower prices than weekend travel on many routes. Use the date strip above to compare nearby days quickly.