$63+ Cheap flights from Ontario (ONT) to Colorado
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/6. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DEN
Mar 29 — Apr 51
1 adult, Economy
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Find cheap flights from Ontario to Colorado with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Colorado
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Cheapest flights from Ontario to ColoradoExplore the most affordable flight options available from Ontario to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 27, 2026.
Explore the most affordable flight options available from Ontario to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 27, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/86:20 am
ONT
- DEN
Nonstop2h 23m
Frontier
Mon 4/1310:30 pm
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/23![Frontier logo]()
$80
This Cheapflightsfares deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/106:20 am
ONT
- DEN
Nonstop2h 23m
Frontier
Tue 4/1410:29 pm
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/25![Frontier logo]()
$81
This Super.com deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/1012:59 am
ONT
- DEN
Nonstop2h 16m
Frontier
Tue 5/1210:29 pm
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/26![Frontier logo]()
$82
This Frontier deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/106:20 am
ONT
- DEN
Nonstop2h 23m
Frontier
Sat 4/1810:29 pm
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/24![Frontier logo]()
$86
This Cheapflightsfares deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:59 am
ONT
- DEN
Nonstop2h 16m
Frontier
Thu 4/166:05 am
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/24![Frontier logo]()
$87
This Super.com deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1612:59 am
ONT
- DEN
Nonstop2h 16m
Frontier
Mon 4/206:05 am
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/26![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2412:59 am
ONT
- DEN
Nonstop2h 16m
Frontier
Fri 5/16:05 am
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/26![Frontier logo]()
$89
This Super.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2212:59 am
ONT
- DEN
Nonstop2h 16m
Frontier
Mon 4/276:05 am
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/25![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Tue 3/3110:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/24![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/512:59 am
ONT
- DEN
Nonstop2h 16m
Frontier
Tue 5/1210:29 pm
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/25![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/412:59 am
ONT
- DEN
Nonstop2h 16m
Frontier
Tue 5/1210:29 pm
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/25![Frontier logo]()
$93
This American Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1212:19 pm
ONT
- DRO
1 stop4h 48m
American Airlines
Mon 3/166:37 pm
DRO
- ONT
1 stop4h 30m
American Airlines
Deal found 2/25![American Airlines logo]()
$200
Best flights from Ontario to ColoradoDiscover carefully curated flight deals from Ontario to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 27, 2026.
Discover carefully curated flight deals from Ontario to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 27, 2026.
This Delta deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:00 am
ONT
- COS
1 stop4h 24m
Delta
Sat 4/118:15 am
COS
- ONT
1 stop5h 08m
Delta
Deal found 2/24![Delta logo]()
$216
This Southwest deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/45:40 am
ONT
- DEN
2 stops5h 20m
Southwest
Sat 4/117:00 am
DEN
- ONT
1 stop5h 05m
Southwest
Deal found 2/23![Southwest logo]()
$252
This United Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/155:00 am
ONT
- COS
1 stop6h 26m
United Airlines
Tue 5/195:12 pm
COS
- ONT
1 stop4h 24m
United Airlines
Deal found 2/24![United Airlines logo]()
$253
This American Airlines deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:15 am
ONT
- DRO
1 stop3h 49m
American Airlines
Sat 3/146:37 pm
DRO
- ONT
1 stop4h 30m
American Airlines
Deal found 2/26![American Airlines logo]()
$329
This Alaska Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/243:26 pm
ONT
- DEN
1 stop7h 33m
Alaska Airlines
Sun 4/266:00 am
DEN
- ONT
2 stops18h 48m
Alaska Airlines
Deal found 2/24![Alaska Airlines logo]()
$333
This Kiwi.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/97:18 pm
ONT
- GJT
1 stop16h 25m
Multiple Airlines
Thu 5/1412:53 pm
GJT
- ONT
2 stops19h 38m
Multiple Airlines
Deal found 2/24![Multiple Airlines logo]()
$343
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/91:20 pm
ONT
- DEN
1 stop5h 37m
Delta
Mon 4/136:27 pm
DEN
- ONT
1 stop6h 17m
Delta
Deal found 2/27![Delta logo]()
$229
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/61:20 pm
ONT
- DEN
1 stop5h 37m
Delta
Thu 4/96:15 pm
DEN
- ONT
1 stop6h 36m
Delta
Deal found 2/23![Delta logo]()
$235
This United Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/245:15 am
ONT
- DEN
Nonstop2h 17m
United Airlines
Mon 3/307:10 pm
DEN
- ONT
Nonstop2h 26m
United Airlines
Deal found 2/25![United Airlines logo]()
$266
This Southwest deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/2411:05 am
ONT
- DEN
2 stops5h 25m
Southwest
Wed 3/253:05 pm
DEN
- ONT
1 stop6h 15m
Southwest
Deal found 2/27![Southwest logo]()
$266
This United Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/131:50 pm
ONT
- MTJ
1 stop5h 16m
United Airlines
Sat 3/214:04 pm
MTJ
- ONT
1 stop7h 53m
United Airlines
Deal found 2/23![United Airlines logo]()
$281
This United Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/255:15 am
ONT
- MTJ
1 stop6h 17m
United Airlines
Wed 4/17:15 am
MTJ
- ONT
1 stop6h 23m
United Airlines
Deal found 2/25![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:00 am
ONT
- DEN
2 stops16h 29m
Delta
Mon 3/166:15 pm
DEN
- ONT
1 stop6h 36m
Delta
Deal found 2/23![Delta logo]()
$293
This Southwest deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/236:00 pm
ONT
- COS
1 stop5h 05m
Southwest
Sun 4/265:30 am
COS
- ONT
2 stops6h 35m
Southwest
Deal found 2/24![Southwest logo]()
$328
This United Airlines deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/135:15 am
ONT
- MTJ
1 stop6h 17m
United Airlines
Tue 3/177:36 am
MTJ
- ONT
1 stop6h 13m
United Airlines
Deal found 2/26![United Airlines logo]()
$281
This Southwest deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/236:30 pm
ONT
- COS
1 stop4h 50m
Southwest
Wed 3/256:00 am
COS
- ONT
1 stop4h 55m
Southwest
Deal found 2/27![Southwest logo]()
$329
This United Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/155:15 am
ONT
- MTJ
1 stop6h 17m
United Airlines
Wed 4/17:15 am
MTJ
- ONT
1 stop6h 23m
United Airlines
Deal found 2/25![United Airlines logo]()
$281
This Delta deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/245:05 pm
ONT
- COS
1 stop4h 24m
Delta
Wed 7/15:55 pm
COS
- ONT
1 stop6h 49m
Delta
Deal found 2/27![Delta logo]()
$335
This United Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/91:34 pm
ONT
- DEN
Nonstop2h 22m
United Airlines
Mon 4/137:10 pm
DEN
- ONT
Nonstop2h 26m
United Airlines
Deal found 2/24![United Airlines logo]()
$281
This Southwest deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/295:05 pm
ONT
- COS
2 stops6h 00m
Southwest
Sun 5/316:20 am
COS
- ONT
1 stop4h 30m
Southwest
Deal found 2/27![Southwest logo]()
$377
This United Airlines deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/31:18 pm
ONT
- DRO
1 stop6h 04m
United Airlines
Tue 6/91:30 pm
DRO
- ONT
1 stop4h 58m
United Airlines
Deal found 2/26![United Airlines logo]()
$325
This United Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/41:45 pm
ONT
- MTJ
1 stop5h 36m
United Airlines
Sun 3/84:58 pm
MTJ
- ONT
1 stop6h 59m
United Airlines
Deal found 2/24![United Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/51:50 pm
ONT
- MTJ
1 stop5h 16m
United Airlines
Sun 3/84:58 pm
MTJ
- ONT
1 stop6h 59m
United Airlines
Deal found 2/26![United Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/245:15 am
ONT
- DRO
1 stop4h 43m
United Airlines
Sun 3/293:23 pm
DRO
- ONT
1 stop6h 13m
United Airlines
Deal found 2/27![United Airlines logo]()
$334
This United Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/216:30 pm
ONT
- COS
1 stop4h 29m
United Airlines
Sat 5/233:42 pm
COS
- ONT
1 stop6h 00m
United Airlines
Deal found 2/27![United Airlines logo]()
$335
This United Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/216:30 pm
ONT
- COS
1 stop4h 29m
United Airlines
Mon 5/2511:31 am
COS
- ONT
1 stop6h 57m
United Airlines
Deal found 2/23![United Airlines logo]()
$335
This United Airlines deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/225:00 am
ONT
- EGE
1 stop6h 23m
United Airlines
Sun 5/247:00 am
EGE
- ONT
1 stop6h 47m
United Airlines
Deal found 2/24![United Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/156:15 am
ONT
- ASE
1 stop5h 53m
United Airlines
Sat 3/214:01 pm
ASE
- ONT
1 stop7h 56m
United Airlines
Deal found 2/23![United Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/171:50 pm
ONT
- ASE
1 stop6h 52m
United Airlines
Sat 3/214:01 pm
ASE
- ONT
1 stop7h 56m
United Airlines
Deal found 2/25![United Airlines logo]()
$339
This United Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/215:10 am
ONT
- GJT
1 stop4h 39m
United Airlines
Sat 4/251:43 pm
GJT
- ONT
2 stops10h 02m
United Airlines
Deal found 2/25![United Airlines logo]()
$341
Last-minute flights from Ontario to ColoradoDiscover last-minute flight deals from Ontario to Colorado. Data last updated February 27, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Colorado. Data last updated February 27, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/106:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Wed 3/1810:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/24![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Wed 3/1810:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/24![Frontier logo]()
$109
This American Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/1212:19 pm
ONT
- DRO
1 stop4h 48m
American Airlines
Mon 3/166:37 pm
DRO
- ONT
1 stop4h 30m
American Airlines
Deal found 2/25![American Airlines logo]()
$200
This Delta deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/135:09 pm
ONT
- GJT
1 stop3h 44m
Delta
Sun 3/157:45 am
GJT
- ONT
1 stop5h 38m
Delta
Deal found 2/26![Delta logo]()
$235
This Super.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Sat 3/2110:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/25![Frontier logo]()
$110
This Super.com deal was found by Cheapflights users on 2/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/186:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Wed 3/2510:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/26![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/186:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Wed 3/1810:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/25![Frontier logo]()
$96
This Frontier deal was found by Cheapflights users on 2/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/196:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Tue 3/3110:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/23![Frontier logo]()
$116
This Super.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Wed 4/110:30 pm
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/25![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Tue 3/3110:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/24![Frontier logo]()
$91
This Cheapflightsfares deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Sat 3/2810:29 pm
DEN
- ONT
Nonstop2h 30m
Frontier
Deal found 2/24![Frontier logo]()
$117
This Cheapflightsfares deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:23 pm
ONT
- DEN
1 stop8h 56m
Frontier
Tue 4/1410:29 pm
DEN
- ONT
Nonstop2h 26m
Frontier
Deal found 2/25![Frontier logo]()
$107
One-way flights from Ontario to ColoradoSearch for one-way flight options from Ontario to Colorado. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.
Search for one-way flight options from Ontario to Colorado. Find affordable one-way fares based on user searches. Data last updated February 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/611:10 am
ONT
- DEN
1 stop15h 49m
Frontier
Deal found 2/24![Frontier logo]()
$63
This Cheapflightsfares deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Deal found 2/24![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/106:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Deal found 2/24![Frontier logo]()
$65
This Super.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/196:15 am
ONT
- DEN
Nonstop2h 20m
Frontier
Deal found 2/25![Frontier logo]()
$68
This Cheapflightsfares deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:20 am
ONT
- DEN
Nonstop2h 23m
Frontier
Deal found 2/25![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/312:23 pm
ONT
- DEN
1 stop8h 56m
Frontier
Deal found 2/25![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/2511:44 am
ONT
- DEN
1 stop7h 16m
Frontier
Deal found 2/24![Frontier logo]()
$72
This United Airlines deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/111:34 pm
ONT
- DEN
Nonstop2h 22m
United Airlines
Deal found 2/25![United Airlines logo]()
$73
This Cheapflightsfares deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:20 am
ONT
- DEN
Nonstop2h 23m
Frontier
Deal found 2/25![Frontier logo]()
$74
This Orbitz deal was found by Cheapflights users on 2/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- DEN
Nonstop2h 16m
Frontier
Deal found 2/24![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/309:49 pm
ONT
- DEN
1 stop5h 07m
Frontier
Deal found 2/25![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 2/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1810:03 pm
ONT
- DEN
1 stop4h 53m
Frontier
Deal found 2/25![Frontier logo]()
$79
Find flight deals from Ontario to Colorado
Keep the following information in mind while searching for Ontario to Colorado flight deals. Data was last updated February 27, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $80 (Cheapflightsfares) |
One-way from | $63 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $208 |
Good round-trip deal | $212 or less |
Good one-way deal | $122 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Colorado that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 27, 2026.
Use the filters below to find and compare flights from Ontario to Colorado that are best for you.
Fly from
Fly to
Route
Depart
Return
OntarioColorado Springs
ONT - COS
ONTCOS
Ontario
Sat 4/4
6:00 am-11:24 am
1 stop4h 24m
Colorado Springs
Sat 4/11
8:15 am-12:23 pm
1 stop5h 08m
$216
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Thu 4/9
1:20 pm-7:57 pm
1 stop5h 37m
Denver Intl
Mon 4/13
6:27 pm-11:44 pm
1 stop6h 17m
$229
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Mon 4/6
1:20 pm-7:57 pm
1 stop5h 37m
Denver Intl
Thu 4/9
6:15 pm-11:51 pm
1 stop6h 36m
$235
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Sat 4/4
5:40 am-12:00 pm
2 stops5h 20m
Denver Intl
Sat 4/11
7:00 am-11:05 am
1 stop5h 05m
$252
OntarioColorado Springs
ONT - COS
ONTCOS
Ontario
Fri 5/15
5:00 am-12:26 pm
1 stop6h 26m
Colorado Springs
Tue 5/19
5:12 pm-8:36 pm
1 stop4h 24m
$253
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Tue 3/24
5:15 am-8:32 am
Nonstop2h 17m
Denver Intl
Mon 3/30
7:10 pm-8:36 pm
Nonstop2h 26m
$266
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Tue 3/24
11:05 am-5:30 pm
2 stops5h 25m
Denver Intl
Wed 3/25
3:05 pm-8:20 pm
1 stop6h 15m
$266
OntarioMontrose
ONT - MTJ
ONTMTJ
Ontario
Fri 3/13
1:50 pm-8:06 pm
1 stop5h 16m
Montrose County
Sat 3/21
4:04 pm-10:57 pm
1 stop7h 53m
$281
OntarioMontrose
ONT - MTJ
ONTMTJ
Ontario
Wed 3/25
5:15 am-12:32 pm
1 stop6h 17m
Montrose County
Wed 4/1
7:15 am-12:38 pm
1 stop6h 23m
$281
OntarioMontrose
ONT - MTJ
ONTMTJ
Ontario
Fri 3/13
5:15 am-12:32 pm
1 stop6h 17m
Montrose County
Tue 3/17
7:36 am-12:49 pm
1 stop6h 13m
$281
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Colorado
Have a flexible travel schedule? Discover the best time to fly to Colorado from Ontario with our price prediction graph.
ONT-DEN
ONT-DRO
ONT-GJT
ONT-COS
ONT-MTJ
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Colorado
ONT-USCO
ONT-DEN
ONT-DRO
ONT-GJT
ONT-COS
What is the cheapest month to book a flight from Ontario to Colorado?
Currently, March is the cheapest month in which you can book a flight from Ontario to Colorado (average of $37). Flying from Ontario to Colorado in September is currently the most expensive (average of $75). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to CO?
Find hourly flight availability from Ontario to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 27, 2026.
It’s typically best to fly out from Ontario to Colorado in the evening. Doing so could potentially save you 51% on the flight price compared to flying at noon, which is usually more expensive.
What is the cheapest day to fly from Ontario to Colorado?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Colorado. Price data was last updated on February 21, 2026.
Travelers seeking maximum savings on their Ontario to Colorado flight should consider departing on Tuesday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Ontario to Colorado
Explore weekly flight availability from Ontario to Colorado. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated February 27, 2026.
The most flights from ONT to USCO are scheduled on a Thursday (11 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).
Reviews of airlines servicing Colorado
Get insights into the airlines that provide service to Colorado. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Colorado. Reviews last updated February 27, 2026.
See what other customers who have flown with Southwest, Delta, and United Airlines from Ontario to Colorado have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Food
7.0
Boarding
8.1
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Ontario to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Ontario to Colorado
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Colorado by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Colorado by cabin class
Find flights from Ontario to Colorado, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Colorado flights
Browse other Ontario and Colorado flight options. Last updated on February 27, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Colorado flights
Consider these flights traveling from Ontario to Colorado.
Top 5 airlines flying from Ontario to Colorado
Discover the top 5 airlines that operate flights from Ontario to Colorado. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$61 | Average$155 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$109 | Average$265 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$117 | Average$313 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$130 | Average$360 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$211 | Average$362 | FlexibilityNo cancel fee | On-time71% |