
| Most accurate provider | eDreams 3 stars | 
|---|---|
| Most trusted provider | eDreams 3 stars | 
| Round-trip from | $413 (FlightHub) | 
| One-way from | $389 (FlightHub) | 
| Popular in | June | 
| Cheapest in | February | 
| Average price | $616 | 
Fly from
Fly to
Route
Depart
Return
Price
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/12
1:00 pm-9:30 am
2 stops14h 30m
Porto
Thu 11/20
6:00 am-1:10 pm
1 stop13h 10m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/12
1:00 pm-9:30 am
2 stops14h 30m
Porto
Fri 11/21
6:00 am-8:05 pm
1 stop20h 05m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Tue 11/11
1:00 pm-9:30 am
2 stops14h 30m
Porto
Fri 11/21
6:00 am-8:05 pm
1 stop20h 05m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/12
10:35 am-10:30 am
2 stops17h 55m
Porto
Wed 11/19
6:00 am-2:20 pm
1 stop14h 20m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/12
2:35 pm-10:30 am
2 stops13h 55m
Porto
Wed 11/19
6:00 am-7:23 pm
2 stops19h 23m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Tue 11/11
10:35 am-10:30 am
2 stops17h 55m
Porto
Tue 11/18
6:05 am-6:11 pm
2 stops18h 06m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/12
1:25 pm-10:30 am
2 stops15h 05m
Porto
Thu 11/20
6:35 am-8:06 am
2 stops31h 31m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/12
5:20 pm-10:30 am
1 stop11h 10m
Porto
Tue 11/18
11:25 am-7:55 am
2 stops26h 30m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/26
1:00 pm-9:30 am
2 stops14h 30m
Porto
Tue 12/2
12:30 pm-1:10 pm
1 stop30h 40m
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/12
7:10 pm-1:05 pm
1 stop11h 55m
| Provider | Price Accuracy | Trust Score* | 
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*1 star | 
The best time to book flights from Chicago O'Hare Intl Airport to Porto is 77 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, November is the cheapest month in which you can book a flight from Chicago O'Hare Intl Airport to Porto (average of $438). Flying from Chicago O'Hare Intl Airport to Porto in June is currently the most expensive (average of $695). 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.
It’s typically best to fly out from Chicago O'Hare Intl Airport to Porto in the evening. Doing so could potentially save you 33% on the flight price compared to flying at noon, which is usually more expensive.
Travelers seeking maximum savings on their Chicago O'Hare Intl Airport to Porto flight should consider departing on Wednesday evenings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
About 100% of weekly flights between Chicago and Porto have experienced delays in the past year, with the average delay time being 319 minutes.
Historically, flights departing at night are less likely to be delayed, whereas flights leaving at night tend to experience delays more often.
Sunday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.
Over the last year, United Airlines have had the lowest number of delays on this route, with just 100% of flights being delayed.
Crew
Overall
Food
Comfort
Boarding
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Crew
Overall
Food
Comfort
Boarding
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Crew
Overall
Food
Comfort
Boarding
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Crew
Overall
Food
Comfort
Boarding
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Crew
Overall
Food
Comfort
Boarding
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
Crew
Overall
Food
Comfort
Boarding
Entertainment
Reviews
Sebrena,Oct 2025
IAH - RSW
| Airline | Cheapest | Average | Flexibility | On-time | 
|---|---|---|---|---|
| Cheapest$464 | Average$691 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$487 | Average$727 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$504 | Average$736 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$526 | Average$637 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$531 | Average$680 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$545 | Average$723 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$554 | Average$719 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$558 | Average$756 | FlexibilityNo cancel fee | On-time79% | |
| Cheapest$638 | Average$841 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$646 | Average$732 | FlexibilityNo cancel fee | On-time67% |