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ORD → Chicago · head to head

Blue Line train to the LooporMetra train to Union Station, by the ATS?

The short answer

These do not go to the same place, so price is not the comparison. The Blue Line train to the Loop reaches The Loop at Clark/Lake, downtown Chicago; the Metra train to Union Station, by the ATS does not. Union Station, across the river from the west edge of the Loop, on weekdays only: the one for Amtrak and the Metra lines west and south.

The Blue Line train to the Loop is quicker: 40 min against 50 min. The Metra train to Union Station, by the ATS varies between 50 and 52 minutes.

Blue Line train to the Loop: Runs all night. Metra train to Union Station, by the ATS: 06:13–16:41, Monday to Friday.

Priced against each other

Whole-party totals · adult fares
What each costs for the whole party, in USD. The cheaper of the two is marked on every row.
TravelersBlue Line train to the LoopMetra train to Union Station, by the ATSDifference
1US$5US$3.75US$1.25
2US$10US$7.50US$2.50
3US$15US$11.25US$3.75
4US$20US$15US$5
5US$25US$18.75US$6.25
6US$30US$22.50US$7.50
7US$35US$26.25US$8.75
8US$40US$30US$10

Side by side

Where each one leaves you
Blue · CTA (Chicago Transit Authority)Blue Line train to the Loop
From
CTA O'Hare station, below the main parking garage, by walkway from Terminals 1, 2 and 3
To
Clark/Lake station in the Loop, where the Blue Line meets the Brown, Green, Orange, Pink and Purple Lines
Runs
All night
Journey
40 min

Every 7 to 10 minutes by day and every 15 to 20 overnight, from about midnight to 04:00.

Arriving at Terminal 5, ride the free ATS train to Terminal 2 or 3 first.

Blue Line train to the Loop: price for every party size

See CTA fares
ATSNCS · MetraMetra train to Union Station, by the ATS
From
ATS station at any terminal, for the free train to O'Hare Transfer station behind the Multi-Modal Facility
To
Chicago Union Station, for Amtrak and Metra trains, across the river from the Loop
Runs
06:13–16:41
Journey
50–52 min

Weekdays only: six trains a day towards the city, the last at 16:41 from O'Hare Transfer.

O'Hare Transfer station is behind the Multi-Modal Facility, on its northeast corner; the ATS takes up to 10 minutes from Terminal 1.

Metra train to Union Station, by the ATS: price for every party size

See Metra fares

This compares two of 5 options. See all of them ranked for your party size

The other comparisons at O'Hare International Airport